Dihelium
- Formula: He2
- Molecular weight: 8.005204
- IUPAC Standard InChIKey: GHVQTHCLRQIINU-UHFFFAOYSA-N
- CAS Registry Number: 12184-98-4
- Chemical structure:
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Constants of diatomic molecules
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Klaus P. Huber and Gerhard H. Herzberg
Data collected through November, 1976
Symbol | Meaning |
---|---|
State | electronic state and / or symmetry symbol |
Te | minimum electronic energy (cm-1) |
ωe | vibrational constant – first term (cm-1) |
ωexe | vibrational constant – second term (cm-1) |
ωeye | vibrational constant – third term (cm-1) |
Be | rotational constant in equilibrium position (cm-1) |
αe | rotational constant – first term (cm-1) |
γe | rotation-vibration interaction constant (cm-1) |
De | centrifugal distortion constant (cm-1) |
βe | rotational constant – first term, centrifugal force (cm-1) |
re | internuclear distance (Å) |
Trans. | observed transition(s) corresponding to electronic state |
ν00 | position of 0-0 band (units noted in table) |
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Rydberg | Rydberg series of np![]() ![]() | |||||||||||
![]() | ||||||||||||
↳Ginter and Ginter, 1968; Rosen, 1970 | ||||||||||||
Rydberg series of np![]() ![]() | ||||||||||||
![]() | ||||||||||||
↳Ginter and Ginter, 1968; Rosen, 1970 | ||||||||||||
u 3![]() ![]() | 177291 | [1628.69] 2Z | (35.25) | 7.212 2 | 0.222 2 | [0.000503] 2 | 1.081 | u ![]() | 33189.16 Z | |||
↳Ginter and Ginter, 1968 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
t' 3![]() ![]() | [177969] | [8.27] 3 | t' ![]() | 33026.6 Z | ||||||||
↳Ginter and Ginter, 1968 | ||||||||||||
t 3![]() ![]() | 177027 | [1629.15] 4 Z | (35.25) | 7.212 4 | 0.230 4 | [0.000507] 4 | 1.081 | t ![]() | 32925.96 Z | |||
↳Ginter and Ginter, 1968 | ||||||||||||
s' 3![]() ![]() | [177636] | [8.04] 3 | s' ![]() | 32693.2 Z | ||||||||
↳Ginter and Ginter, 1968 | ||||||||||||
s 3![]() ![]() | 176658 | [1629.30] 5 Z | (35.25) | 7.213 5 | 0.2234 5 | 0.00051 5 | 1.0806 | s ![]() | 32556.66 Z | |||
↳Ginter and Ginter, 1968 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
r' 3![]() ![]() | [177154] | [7.78] 3 | r' ![]() | 32211.7 Z | ||||||||
↳Ginter and Ginter, 1968 | ||||||||||||
r 3![]() ![]() | 176117 | (1700.56) 6 | (35.25) | [7.1044] 6 | 6 | [0.000508] 6 | [1.0889] | r ![]() | 11625.3 Z | |||
↳Rosen, 1970 | ||||||||||||
176117 | r ![]() | 32016.56 Z | ||||||||||
↳Ginter and Ginter, 1968 | ||||||||||||
p' 3![]() ![]() | [176421] | [7.543] 3 | p' ![]() | 31478.6 Z | ||||||||
↳Ginter and Ginter, 1968 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
q 3![]() ![]() | [176195] | [7.092] 7 | [0.00050] 7 | [1.0898] | q ![]() | 20365 | ||||||
↳Dieke, 1929; Rosen, 1970 | ||||||||||||
q ![]() | 26483 | |||||||||||
↳Dieke, 1929; Rosen, 1970 | ||||||||||||
q 3![]() ![]() | [(176169)] | q ![]() | (20330) | |||||||||
↳Dieke, 1929; Rosen, 1970 | ||||||||||||
q ![]() | (26466) | |||||||||||
↳Dieke, 1929; Rosen, 1970 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
q 3![]() ![]() | [176120] | [] 7 | q ![]() | 20288 | ||||||||
↳Dieke, 1929; Rosen, 1970 | ||||||||||||
q ![]() | 26409 | |||||||||||
p 3![]() ![]() | 175281 | 1701.18 Z | 35.35 | 7.220 8 | 0.224 | 0.000514 | 1.0801 | p ![]() | 10788.68 Z | |||
↳Rosen, 1970 | ||||||||||||
175281 | p ![]() | 31179.93 Z | ||||||||||
↳Ginter and Ginter, 1968 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
o 3![]() ![]() | [176001] | [7.109] | [0.00051] | [1.0885] | o ![]() | 20168.8 Z | ||||||
↳missing citation | ||||||||||||
[176001] | o ![]() | 26290.3 Z | ||||||||||
↳Dieke, Imanishi, et al., 1929; Rosen, 1970 | ||||||||||||
n 3![]() ![]() | 174389 | [1619.52] Z | (36.5) | 7.4754 9 | 0.2490 | [0.000721] 10 | 1.0615 | n ![]() | 30283.26 Z | |||
↳Jevons, 1932; Orth and Ginter, 1976 | ||||||||||||
m 3![]() ![]() | [174863] | [7.09] 11 | [1.091] | m ![]() | (19039) | |||||||
↳Rosen, 1970 | ||||||||||||
m ![]() | (25152) | |||||||||||
↳Rosen, 1970 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
m 3![]() ![]() | 174778 | [7.07] 12 | m ![]() | (18944) | ||||||||
↳Rosen, 1970 | ||||||||||||
m ![]() | (25070) | |||||||||||
↳Rosen, 1970 | ||||||||||||
m 3![]() ![]() | [174730] | m ![]() | 18899 | |||||||||
↳Rosen, 1970 | ||||||||||||
m ![]() | 25019 | |||||||||||
↳Rosen, 1970 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
l 3![]() ![]() | 173884 | [1633.96] 13 Z | (35.25) | 7.226 13 | 0.222 13 | [0.000512] 13 | 1.0797 | l ![]() | 9393.9 Z | |||
↳Rosen, 1970 | ||||||||||||
29785.31 Z | ||||||||||||
↳Ginter and Ginter, 1968 | ||||||||||||
k 3![]() ![]() | (173698) | [1635.3] Z | 7.232 | 0.23 | 1.079 | k ![]() | 18683.5 Z | |||||
↳Rosen, 1970 | ||||||||||||
k ![]() | 24804.8 Z | |||||||||||
↳Rosen, 1970 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
k' 3![]() ![]() | 172236 | 1686.90 Z | 38.10 | 7.379 14 | 0.349 15 | [5.8E-4] | 1.0684 | k' ![]() | 28127.58 Z | |||
↳Orth and Ginter, 1976 | ||||||||||||
j 3![]() ![]() | 171573 | 1702.24 16Z | 35.07 | 7.2088 16 | 0.2248 17 | 5.2E-4 16 | 1.0810 | j ![]() | 16583.18 16Z | |||
↳Brown and Ginter, 1973 | ||||||||||||
j ![]() | 22704.5 16Z | |||||||||||
↳Brown and Ginter, 1973 | ||||||||||||
j 3![]() ![]() | 171402 | 1680.94 16 Z | 40.81 | 7.1860 16 | 0.2296 18 | 5.4E-4 16 | 1.0827 | j ![]() | 16400.69 16 Z | |||
↳Brown and Ginter, 1973 | ||||||||||||
j ![]() | 22522.0 16 Z | |||||||||||
↳Brown and Ginter, 1973 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
j 3![]() ![]() | 171323 | 1669.79 19 | 39.09 | j ![]() | 16316.54 19 Z | |||||||
↳Brown and Ginter, 1973 | ||||||||||||
j 3![]() ![]() | j ![]() | 22437.8 19 Z | ||||||||||
↳Brown and Ginter, 1973 | ||||||||||||
i 3![]() ![]() | 171290 | [1637.94] 21Z | (35.25) | 7.242 21 | 0.223 21 | [5.14E-4] 21 | 1.0785 | i ![]() | 27193.01 Z | |||
↳Ginter and Ginter, 1968; Rosen, 1970 | ||||||||||||
h 3![]() ![]() | (170884) | [1637.9] Z | 7.264 22 | 0.23 | (5.24E-4) | 1.077 | h ![]() | 15870.7 Z | ||||
↳Dieke, Imanishi, et al., 1929; Rosen, 1970; Brown and Ginter, 1973 | ||||||||||||
h ![]() | 21992.2 Z | |||||||||||
↳Dieke, Imanishi, et al., 1929; Rosen, 1970; missing citation | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
g 3![]() ![]() | 167714 | [1589.92] Z | (41) | 7.2207 | 0.2478 | [5.38E-4] 23 | 1.0801 | g ![]() | 23597.00 Z | |||
↳Orth and Ginter, 1976 | ||||||||||||
f 3![]() ![]() | 166303 | 1706.82 Z | 35.10 | 7.230 24 | 0.227 25 | [5.26e-4] 26 | 1.0794 | f ![]() | 11316.06 Z | |||
f ![]() | 17437.3 Z | |||||||||||
↳missing citation | ||||||||||||
f 3![]() ![]() | 165877 27 | 1661.48 Z | 44.79 | 7.136 24 | 0.235 28 | [5.34E-4] 29 | 1.0865 | f ![]() | 10864.53 Z | |||
↳Ginter, 1966 | ||||||||||||
f ![]() | 16985.8 Z | |||||||||||
↳Ginter, 1965; Rosen, 1970 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
f 3![]() ![]() | 165685 | 1635.77 Z | 44.41 | 7.071 24 | 0.246 30 | [5.31E-4] 31 | 1.0914 | f ![]() | 10659.33 Z | |||
f ![]() | 106780.6 Z | |||||||||||
e 3![]() ![]() | 165598 | 1721.22 Z | 34.970 32 | 7.2838 33 | 0.2215 34 | 5.22E-4 | 1.0754 | ea ![]() | 21507.26 Z | |||
↳Brown and Ginter, 1971 | ||||||||||||
d 3![]() ![]() | 164479 | 1728.01 Z | 36.13 36 | 7.342 | 0.2244 37 | 5.32E-4 | 1.0712 | d ![]() | 9502.7 Z | |||
↳Ginter, 1965 | ||||||||||||
d ![]() | 15623.1 Z | |||||||||||
↳missing citation | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
c 3![]() ![]() | 155053 | 1583.85 Z | 52.74 38 | 7.0048 | 0.3105 39 | [5.56E-4] 40 | 1.0966 | c ![]() | 10889.48 Z | |||
↳Ginter, 1965, 2 | ||||||||||||
b 3![]() ![]() | 148835 | 1769.07 Z | 35.02 41 | 7.4473 42 | 0.2196 43 | [5.30E-4] 44 | 1.0635 | b ![]() | 4768.2 Z | |||
↳Hepner and Herman, 1956; Gloersen and Dieke, 1965 | ||||||||||||
a 3![]() ![]() | 144048 | 1808.56 Z | 38.21 45 46 | 7.7036 47 | 0.2281 48 | 5.56E-4 49 | 1.0457 | (a ![]() | 144935 50 | |||
S 1![]() ![]() | [177515] | (7.21) | (0.22) | (1.081) | S ![]() | 30228.6 Z | ||||||
↳Rosen, 1970 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
R 1![]() ![]() | [176983] | (7.22) | (0.22) | (1.080) | R ![]() | 29696.4 Z | ||||||
↳Rosen, 1970 | ||||||||||||
P 1![]() ![]() | [176160] | (7.22) | (0.22) | (1.080) | P ![]() | 28873.9 Z | ||||||
↳Rosen, 1970 | ||||||||||||
M 1![]() ![]() | [(174838)] | [7.09] 51 | [1.091] | M ![]() | (24050) | |||||||
↳Rosen, 1970 | ||||||||||||
M 1![]() ![]() | [(174788)] | [7.07] 52 | 1.091 | M ![]() | (24000) | |||||||
↳Rosen, 1970 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
M 1![]() ![]() | [7.07] 52 | 1.091 | M ![]() | (23960) | ||||||||
↳Rosen, 1970 | ||||||||||||
L 1![]() ![]() | [174794] | (7.23) | (0.222) | (1.079) | L ![]() | 27507.8 Z | ||||||
↳Rosen, 1970 | ||||||||||||
J 1![]() ![]() | [172416] | [7.097] 53 | [5.0E-4] | [1.0894] | J ![]() | 14183.90 53 Z | ||||||
↳Brown and Ginter, 1973 | ||||||||||||
J ![]() | 21627.9 53 Z | |||||||||||
↳Brown and Ginter, 1973 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
J 1![]() ![]() | [172290] | [7.080] 53 | [5.4E-4] | [1.0908] | J ![]() | 14058.37 53 Z | ||||||
↳Brown and Ginter, 1973 | ||||||||||||
J ![]() | 21502.4 53 Z | |||||||||||
↳Brown and Ginter, 1973 | ||||||||||||
J 1![]() ![]() | [172222] 54 | J ![]() | 13990.32 54 Z | |||||||||
↳Brown and Ginter, 1973 | ||||||||||||
J 1![]() ![]() | J ![]() | 21434.3 54 Z | ||||||||||
↳Brown and Ginter, 1973 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
I 1![]() ![]() | [172266] | (7.242) | (0.223) | (1.078) | I ![]() | 24979.6 Z | ||||||
↳Rosen, 1970 | ||||||||||||
H 1![]() ![]() | [171951] | (7.26) 56 | (0.23) | (1.077) | H ![]() | 13719.5 Z | ||||||
↳Rosen, 1970; Brown and Ginter, 1973 | ||||||||||||
H ![]() | 21163.5 Z | |||||||||||
↳Rosen, 1970; Brown and Ginter, 1973 | ||||||||||||
F 1![]() ![]() | 166304 | 1706.59 Z | 35.06 | 7.230 57 | 0.225 58 | [5.20E-4] 59 | 1.0794 | F ![]() | 16360.9 Z | |||
↳Ginter, 1965, 3; Ginter, 1966 | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
F 1![]() ![]() | 165971 60 | 1670.87 Z | 20.03 | 7.156 57 | 0.235 | [5.24E-4] 61 | 1.0849 | F ![]() | 16008.3 Z | |||
↳Ginter, 1965, 3; Ginter, 1966 | ||||||||||||
F 1![]() ![]() | (165813) | [1564.25] Z | (10) | 7.098 57 | 0.246 | [5.21E-4] 62 | 1.0894 | F ![]() | 15837.5 Z | |||
↳Ginter, 1965, 3; Ginter, 1966 | ||||||||||||
E 1![]() ![]() | 165911 | 1721.19 Z | 34.76 63 | 7.2705 64 | 0.2156 65 | 5.20E-4 | 1.0764 | E ![]() | 19476.61 Z | |||
↳Brown and Ginter, 1971 | ||||||||||||
D 1![]() ![]() | 165085 | 1746.43 Z | 35.54 | 7.365 | 0.2180 66 | 5.24E-4 67 | 1.0694 | D ![]() | 15161.81 Z | |||
↳Ginter, 1965, 3 | ||||||||||||
D ![]() | ||||||||||||
State | Te | ![]() | ![]() | ![]() | Be | ![]() | ![]() | De | ![]() | re | Trans. | ![]() |
C 1![]() ![]() | 157415 | 1653.43 Z | 41.04 71 | 7.052 | 0.215 72 | 5.08E-4 73 | 1.0929 | C ![]() | 10945.50 Z | |||
↳Ginter, 1965, 2; Rosen, 1970 | ||||||||||||
B 1![]() ![]() | 149914 | 1765.76 Z | 34.39 74 | 7.403 75 | 0.216 75 | 5.02E-4 75 | 1.0667 | (B-A) | 3501.5 76 | |||
A 1![]() ![]() | 146365 77 | 1861.33 Z | 35.28 78 | 7.7789 | 0.2166 79 | 5.44E-4 | 1.0406 | AX ![]() | 147279 81 | |||
↳Tanaka and Yoshino, 1963; Mies and Smith, 1966; Smith, 1967; Chow, Smith, et al., 1971 | ||||||||||||
X 1![]() | 0 82 | 2.97 83 |
Notes
1 | missing note |
2 | Refers to ![]() ![]() |
3 | Effective value, strongly affected by l-uncoupling. |
4 | Refers to ![]() ![]() |
5 | Refers to ![]() ![]() |
6 | Constants refer to ![]() ![]() ![]() ![]() |
7 | Strong l-uncoupling. The rotational constants Dieke, 1929 refer to
the average of ![]() ![]() |
8 | Refers to ![]() ![]() |
9 | Several small accidental perturbations. |
10 | D1 = 6.82E-4, H0 = 14.2E-8, H1 ~ -26E-8. |
11 | Average of ![]() ![]() |
12 | Average of ![]() ![]() ![]() |
13 | Refers to ![]() |
14 | Several small accidental perturbations. |
15 | missing note |
16 | The vibrational and rotational constants refer to ![]() ![]() |
17 | missing note |
18 | missing note |
19 | Constants refer to N'=1. |
20 | Strongly perturbed by l-uncoupling and by interaction with the h state. 22 |
21 | Constants refer to 3![]() |
22 | Brown and Ginter, 1973 give average effective constants for the four interacting components
j(3![]() ![]() ![]() ![]() |
23 | H0 = 2.0E-8. |
24 | These constants are corrected for l-uncoupling effects. |
25 | missing note |
26 | D1=5.28E-4, D2=5.50E-4, H0=2.5E-8 |
27 | Ab initio calculations of f 3![]() ![]() |
28 | missing note |
29 | D1=5.34E-4, D2=5.74E=4, H0=2.9E-8. |
30 | missing note |
31 | D1=5.34E-4, D2=5.45E-4, H0 = 0.91E-8. |
32 | See also 33 |
33 | The rotational constants refer to ![]() ![]() ![]() |
34 | missing note |
35 | Observed in absorption in a pulsed discharge Callear and Hedges, 1967. |
36 | missing note |
37 | missing note |
38 | ![]() |
39 | ![]() |
40 | D1= 5.76E-4, D2= 6.11E-4,...; H0=1.32E-8, H1= -0.40E-8, H2=-5.3E-8,... . |
41 | missing note |
42 | The constants refer to 3![]() ![]() ![]() ![]() ![]() |
43 | missing note |
44 | D1= 5.34E-4,...; H0= 2.80E-8, H1= 3.60E-8,... |
45 | Brown and Ginter, 1971 |
46 | There is good experimental Ludlum, Larson, et al., 1967, Ginter and Battino, 1970 and theoretical Poshusta and Matsen, 1963, Klein, Greenawalt, et al., 1967, Gupta, 1972 evidence for a potential maximum in this state. Ludlum, Larson, et al., 1967 place the maximum at 0.067 eV above the asymptote; the net dissociation energy is 1.850 eV. |
47 | From molecular beam magnetic resonance experiments Lichten, McCusker, et al., 1974, Vierima, 1975 have determined
the triplet splitting for N=1 and 3. The splitting constants (extrapolated to N=0)
are ![]() ![]() ![]() |
48 | missing note |
49 | He ~ 2.7E-8 Brown and Ginter, 1971. |
50 | Energy of a 3![]() |
51 | Average of ![]() ![]() |
52 | Average of ![]() ![]() ![]() |
53 | These constants refer to ![]() ![]() |
54 | Refers to N=1. |
55 | Strongly perturbed by l-uncoupling and interaction with H 1![]() |
56 | Brown and Ginter, 1973 give average effective constants for the four interacting components
J(1![]() ![]() ![]() ![]() |
57 | These constants are corrected for l-uncoupling effects. |
58 | missing note |
59 | D1=5.26E-4, H0=2.18E-8. |
60 | Ab initio calculations of f 3![]() ![]() |
61 | D1=5.26E-4, H0 = 1.97E-8. |
62 | D1=5.29E-4. |
63 | missing note |
64 | The rotational constants refer to ![]() ![]() ![]() |
65 | missing note |
66 | missing note |
67 | missing note |
68 | Franck-Condon factors Zhirnov and Shadrin, 1968. |
69 | The weak maximum near 676 Å in the Hopfield continuum is ascribed by
Chow and Smith, 1971 to the transition D![]() |
70 | continuum |
71 | ![]() |
72 | missing note |
73 | H0 = 1.72E-8,... |
74 | Ginter, 1965, 3. |
75 | Be refers to ![]() ![]() ![]() ![]() ![]() |
76 | From Rosen, 1970. |
77 | RKR potential curve Smith and Chow, 1970[see also Rosen, 1970]; ab initio potential Mukamel and Kaldor, 1971. The latter gives
vibrational and rotational levels in good agreement with the experimental values. Tanaka and Yoshino, 1963
have established, from the absorption and emission bands near 600 Å, a
potential maximum of 0.059 eV in the A 1![]() |
78 | Brown and Ginter, 1971 |
79 | Brown and Ginter, 1971. |
80 | Transitions from the low vibrational levels of A 1![]() ![]() ![]() ![]() |
81 | Energy of the v=0,N=0 level of A 1![]() ![]() ![]() ![]() |
82 | Repulsive potential with very small well (De = 0.90 meV). |
83 | From differential elastic scattering measurements Farrar and Lee, 1972, Burgmans, Farrar, et al., 1976. |
84 | Average of two independent values for the well depth obtained from measurements of the total Bennewitz, Busse, et al., 1972 and differential Farrar and Lee, 1972, Burgmans, Farrar, et al., 1976 elastic scattering cross sections (0.888 and 0.905 meV, respectively). Ab initio values range from 0.78 to 1.04 meV Schaefer, McLaughlin, et al., 1970, McLaughlin and Schaefer, 1971, Liu and McLean, 1973, Bertoncini and Wahl, 1970, Kleinman and Wolfsberg, 1974, Snook and Spurling, 1975. Both experiment and theory agree that no bound vibrational level exists in the potential well, i.e. D00 =0; see Murrell, 1969, Poulat, Larsen, et al., 1975. A somewhat higher De value (De= 0.99 meV Chapman, 1975) was derived Chapman, 1975 from the temperature dependence of the relaxation time in dilute 3He. For measurements of the short-range potential (0.49 < r(Å)< 1.56) see Foreman, Rol, et al., 1974; the long-range potential is discussed by Alexander, 1970, Bruch and McGee, 1970. |
85 | Based on D00(He2+). From a detailed interpretation of the Hopfield continuum
and the 600 Å absorption and emission bands Ginter and Brown, 1972 derives De(A 1![]() |
86 | Relative to He(1S)+He(1S), i.e. I.P.(He2) = I.P.(He) - D00(He2+). The I.P.
for the lowest stable state (a 3![]() |
87 | Giving the v=0,N=0 levels (real or hypothetical)
of np![]() ![]() ![]() ![]() ![]() ![]() |
References
Go To: Top, Constants of diatomic molecules, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Ginter and Ginter, 1968
Ginter, M.L.; Ginter, D.S.,
Spectrum and structure of the He2 molecule. V. Characterization of the triplet states associated with the UAO's 6-17p«pi» and 7-12p«sigma»,
J. Chem. Phys., 1968, 48, 2284. [all data]
Rosen, 1970
Rosen, B.,
International tables of selected constants. 17. Spectroscopic data relative to diatomic molecules, Pub. Pergamon Press, Oxford, 1970, 0. [all data]
Dieke, 1929
Dieke, G.H.,
Uber die eigenschaften einer klasse von molekultermen, insbesondere der terme des heliummolekuls,
Z. Phys., 1929, 57, 71. [all data]
Dieke, Imanishi, et al., 1929
Dieke, G.H.; Imanishi, S.; Takamine, T.,
Neue gesetzmabigkeiten im bandenspektrum des heliums. III,
Z. Phys., 1929, 57, 305. [all data]
Jevons, 1932
Jevons, W.,
Report on band-spectra of diatomic molecules, Pub. The Physical Society, The University Press, London, 1932, 0. [all data]
Orth and Ginter, 1976
Orth, F.B.; Ginter, M.L.,
The spectrum and structure of the He2 molecule. Characterization of the triplet states associated with the UAO's 4p«sigma», 5p«sigma», and 6p«sigma»,
J. Mol. Spectrosc., 1976, 61, 282. [all data]
Brown and Ginter, 1973
Brown, C.M.; Ginter, M.L.,
Spectrum and structure of the He2 molecule. Characterization of the singlet and triplet states associated with the UAO'S 4s, 4d«sigma», 4d«pi», and 4d«delta»,
J. Mol. Spectrosc., 1973, 46, 256. [all data]
Ginter, 1966
Ginter, M.L.,
Spectrum and structure of the He2 molecule. IV. Characterization of the singlet and triplet states associated with the UAO's 3d«sigma», 3d«pi», and 3d«delta»,
J. Chem. Phys., 1966, 45, 248. [all data]
Ginter, 1965
Ginter, M.L.,
The spectrum and structure of the He2 molecule. Part III. Characterization of the triplet states associated with the UAO's 3s and 2p«pi»,
J. Mol. Spectrosc., 1965, 18, 321. [all data]
Brown and Ginter, 1971
Brown, C.M.; Ginter, M.L.,
Spectrum and structure of the He2 molecule. VI. Characterization of the states associated with the UAO's 3p«pi» and 2s,
J. Mol. Spectrosc., 1971, 40, 302. [all data]
Ginter, 1965, 2
Ginter, M.L.,
Spectrum and structure of the He2 molecule. I. Characterization of the states associated with the UAO's 3p«sigma» and 2s,
J. Chem. Phys., 1965, 42, 561. [all data]
Hepner and Herman, 1956
Hepner, G.; Herman, L.,
Spectroscopie. Nouveau systeme de bandes d'emission de la molecule He2 vers 4700 cm-1,
C.R. Acad. Sci. Paris, Ser. B, 1956, 243, 1504. [all data]
Gloersen and Dieke, 1965
Gloersen, P.; Dieke, G.H.,
Molecular spectra of hydrogen and helium in the infrared,
J. Mol. Spectrosc., 1965, 16, 191. [all data]
Ginter, 1965, 3
Ginter, M.L.,
The spectrum and structure of the He2 molecule. Part II. Characterization of the singlet states associated with the UAO's 3s and 2p«pi»,
J. Mol. Spectrosc., 1965, 17, 224. [all data]
Tanaka and Yoshino, 1963
Tanaka, Y.; Yoshino, K.,
600-Å band of helium,
J. Chem. Phys., 1963, 39, 3081. [all data]
Mies and Smith, 1966
Mies, F.H.; Smith, A.L.,
Bandlike structure from continuum-continuum emission: the He2 600-Å bands,
J. Chem. Phys., 1966, 45, 994. [all data]
Smith, 1967
Smith, A.L.,
Observing the effect of a change in mass on de Broglie wavelength: the 600-Å bands of 3He2,
J. Chem. Phys., 1967, 47, 1561. [all data]
Chow, Smith, et al., 1971
Chow, K.W.; Smith, A.L.; Waggoner, M.G.,
Absorption coefficients of helium between 599 and 610 Å; transition moment for He2 A1 «SIGMA»u+ <-- X1 «SIGMA»g+,
J. Chem. Phys., 1971, 55, 4208. [all data]
Browne, 1965
Browne, J.C.,
Quantum mechanical potential energy curves for the 1«PI»u and 3«PI»u states of He2 and the 1«PI»g and 3«PI»g states of H2,
Phys. Rev. A: Gen. Phys., 1965, 138, 9. [all data]
Gupta and Matsen, 1969
Gupta, B.K.; Matsen, F.A.,
Quantum-mechanical study of the F1«PI»u and f3«PI»u states of He2,
J. Chem. Phys., 1969, 50, 3797. [all data]
Mulliken, 1964
Mulliken, R.S.,
Rare-gas and hydrogen molecule electronic states, noncrossing rule, and recombination of electrons with rare-gas and hydrogen ions,
Phys. Rev., 1964, 136, 962. [all data]
Dieke and Robinson, 1950
Dieke, G.H.; Robinson, E.S.,
The molecular spectrum of He3,
Phys. Rev., 1950, 80, 1. [all data]
Callear and Hedges, 1967
Callear, A.B.; Hedges, R.E.M.,
Metastability of rotationally hot dihelium at 77° K,
Nature (London), 1967, 215, 1267. [all data]
Ludlum, Larson, et al., 1967
Ludlum, K.H.; Larson, L.P.; Caffrey, J.M., Jr.,
Activation energy for the three-body reaction of helium triplet atom with normal helium,
J. Chem. Phys., 1967, 46, 127. [all data]
Ginter and Battino, 1970
Ginter, M.L.; Battino, R.,
Potential-energy curves for the He2 molecule,
J. Chem. Phys., 1970, 52, 4469. [all data]
Poshusta and Matsen, 1963
Poshusta, R.D.; Matsen, F.A.,
Potential curve of the metastable helium molecule,
Phys. Rev., 1963, 132, 307. [all data]
Klein, Greenawalt, et al., 1967
Klein, D.J.; Greenawalt, E.M.; Matsen, F.A.,
Adjustment of ab initio potential curves,
J. Chem. Phys., 1967, 47, 4820. [all data]
Gupta, 1972
Gupta, B.K.,
On the potential curve of the metastable helium molecule,
Mol. Phys., 1972, 23, 75. [all data]
Lichten, McCusker, et al., 1974
Lichten, W.; McCusker, M.V.; Vierima, T.L.,
Fine structure of the metastable a3«SIGMA»u+ state of the helium molecule,
J. Chem. Phys., 1974, 61, 2200. [all data]
Vierima, 1975
Vierima, T.L.,
Determination of the sign of the spin-spin interaction in He2(a3«SIGMA»u+),
J. Chem. Phys., 1975, 62, 2925. [all data]
Beck, Nicolaides, et al., 1974
Beck, D.R.; Nicolaides, C.A.; Musher, J.I.,
Calculation of the fine structure of the a3«SIGMA»u+ state of molecular helium,
Phys. Rev. A: Gen. Phys., 1974, 10, 1522. [all data]
Zhirnov and Shadrin, 1968
Zhirnov, N.I.; Shadrin, O.P.,
Calculation of Franck-Condon factors with Poschl-Teller wavefunctions. I. The probabilities of some vibrational transitions in the D1«SIGMA»u+-B1«PI»g band system of the He2 molecule,
Opt. Spectrosc. Engl. Transl., 1968, 24, 478, In original 890. [all data]
Chow and Smith, 1971
Chow, K.-W.; Smith, A.L.,
Repulsive potential curves from molecular continuum-continuum emission. III. He2(X1«SIGMA»g+),
J. Chem. Phys., 1971, 54, 1556. [all data]
Guberman and Goddard, 1972
Guberman, S.L.; Goddard, W.A., III,
On the origin of energy barriers in the excited states of He2,
Chem. Phys. Lett., 1972, 14, 460. [all data]
Andresen and Kuppermann, 1975
Andresen, B.; Kuppermann, A.,
The scattering of excited by ground state atoms application to He2,
Mol. Phys., 1975, 30, 997. [all data]
Guberman and Goddard, 1975
Guberman, S.L.; Goddard, W.A., III,
Nature of the excited states of He2,
Phys. Rev. A: Gen. Phys., 1975, 12, 1203. [all data]
Smith and Chow, 1970
Smith, A.L.; Chow, K.W.,
RKR potential and more accurate dissociation energy of He2(A1«SIGMA»u+),
J. Chem. Phys., 1970, 52, 1010. [all data]
Mukamel and Kaldor, 1971
Mukamel, S.; Kaldor, U.,
Potential of the A1«SIGMA»u+ state of He2,
Mol. Phys., 1971, 22, 1107. [all data]
Allison, Browne, et al., 1966
Allison, D.C.; Browne, J.C.; Dalgarno, A.,
Collision-induced de-activation of metastable helium,
Proc. Phys. Soc. London, 1966, 89, 41. [all data]
Scott, Greenawalt, et al., 1966
Scott, D.R.; Greenawalt, E.M.; Browne, J.C.; Matsen, F.A.,
Quantum-mechanical potential-energy curve for the lowest 1«SIGMA»u+ state of He2,
J. Chem. Phys., 1966, 44, 2981. [all data]
Tanaka, Jursa, et al., 1958
Tanaka, Y.; Jursa, A.S.; LeBlanc, F.J.,
Continuous emission spectra of rare gases in the vacuum ultraviolet region. II. Neon and helium,
J. Opt. Soc. Am., 1958, 48, 304. [all data]
Michaelson and Smith, 1970
Michaelson, R.C.; Smith, A.L.,
Time resolved studies of rare-gas molecular emission in the vacuum ultraviolet: helium and argon,
Chem. Phys. Lett., 1970, 6, 1. [all data]
Mukamel and Kaldor, 1973
Mukamel, S.; Kaldor, U.,
Ab initio calculation of the He2 A1«SIGMA»u+ <-- X1«SIGMA»g+ absorption spectrum,
Mol. Phys., 1973, 26, 291. [all data]
Peatman and Wu, 1973
Peatman, W.B.; Wu, D.T.,
The 600 Å bands of helium,
Chem. Phys., 1973, 2, 335. [all data]
Sando and Dalgarno, 1971
Sando, K.M.; Dalgarno, A.,
The absorption of radiation near 600 Å by helium,
Mol. Phys., 1971, 20, 103. [all data]
Miller, Freund, et al., 1975
Miller, T.A.; Freund, R.S.; Zegarski, B.R.; Jost, R.; Lombardi, M.; Derouard, J.,
Observation of singlet-triplet anticrossings in 4He2,
J. Chem. Phys., 1975, 63, 4042. [all data]
Farrar and Lee, 1972
Farrar, J.M.; Lee, Y.T.,
Intermolecular potentials from crossed beam differential elastic scattering measurements. V. The attractive well of He2,
J. Chem. Phys., 1972, 56, 5801. [all data]
Burgmans, Farrar, et al., 1976
Burgmans, A.L.J.; Farrar, J.M.; Lee, Y.T.,
Attractive well of He-He from 3He-4He differential elastic scattering measurements,
J. Chem. Phys., 1976, 64, 1345. [all data]
Bennewitz, Busse, et al., 1972
Bennewitz, H.G.; Busse, H.; Dohmann, H.D.; Oates, D.E.; Schrader, W.,
Evidence for different interaction potentials for He4 - He4 and He3 - He3 from scattering cross-section measurements,
Phys. Rev. Lett., 1972, 29, 533. [all data]
Schaefer, McLaughlin, et al., 1970
Schaefer, H.F., III; McLaughlin, D.R.; Harris, F.E.; Alder, B.J.,
Calculation of the attractive He pair potential,
Phys. Rev. Lett., 1970, 25, 988. [all data]
McLaughlin and Schaefer, 1971
McLaughlin, D.R.; Schaefer, H.F., III,
Interatomic correlation energy and the van der Waals attraction between two helium atoms,
Chem. Phys. Lett., 1971, 12, 244. [all data]
Liu and McLean, 1973
Liu, B.; McLean, A.D.,
Accurate calculation of the attractive interaction of two ground state helium atoms,
J. Chem. Phys., 1973, 59, 4557. [all data]
Bertoncini and Wahl, 1970
Bertoncini, P.; Wahl, A.C.,
Ab initio calculation of the helium-helium 1«SIGMA»g+ potential at intermediate and large separations,
Phys. Rev. Lett., 1970, 25, 991. [all data]
Kleinman and Wolfsberg, 1974
Kleinman, L.I.; Wolfsberg, M.,
Adiabatic correction to the van der Waals well depth of He2,
J. Chem. Phys., 1974, 61, 4366. [all data]
Snook and Spurling, 1975
Snook, I.K.; Spurling, T.H.,
Symmetry adapted perturbation theory of intermolecular potentials. The helium-helium interaction,
J. Chem. Soc. Faraday Trans. 2, 1975, 71, 852. [all data]
Murrell, 1969
Murrell, J.N.,
Bound vibrational states for weakly attractive potentials,
Mol. Phys., 1969, 16, 601. [all data]
Poulat, Larsen, et al., 1975
Poulat, C.; Larsen, S.Y.; Novaro, O.,
Is there a helium molecule?,
Mol. Phys., 1975, 30, 645. [all data]
Chapman, 1975
Chapman, R.,
Temperature dependence of the relaxation time in dilute 3He gas: an investigation of the He-He potential,
Phys. Rev. A: Gen. Phys., 1975, 12, 2333. [all data]
Foreman, Rol, et al., 1974
Foreman, P.B.; Rol, P.K.; Coffin, K.P.,
The repulsive 1«SIGMA»g+ He2 potential obtained from total cross sections,
J. Chem. Phys., 1974, 61, 1658. [all data]
Alexander, 1970
Alexander, M.H.,
Exact treatment of the long-range dipole-dipole interaction between two helium atoms,
J. Chem. Phys., 1970, 52, 3354. [all data]
Bruch and McGee, 1970
Bruch, L.W.; McGee, I.J.,
Semiempirical helium intermolecular potential. II. Dilute gas properties,
J. Chem. Phys., 1970, 52, 5884. [all data]
Ginter and Brown, 1972
Ginter, M.L.; Brown, C.M.,
Dissociation energies of X2«SIGMA»u+ (HE2+) and A1«SIGMA»u+ (He2),
J. Chem. Phys., 1972, 56, 672. [all data]
Notes
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