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Dihelium


Constants of diatomic molecules

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: K.P. Huber and G. Herzberg

Data collected through November, 1976

Symbols used in the table of constants
SymbolMeaning
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)
Diatomic constants for 4He2
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
RydbergRydberg series of nppi 3Pig levels (b,e,i,l,p,r,s,t,u,...)
nu 1 = 34302.20 - R/n=0.071)2, n=2...17
Ginter and Ginter, 1968; Rosen, 1970
Rydberg series of npsigma 3Sigmag+ levels (c,g,k',n,p',r',s',t',...)
nu 1 = 34302.20 - R/n=0.777)2, n=3...12
Ginter and Ginter, 1968; Rosen, 1970
u 3Pig 10ppi 177291 [1628.69] 2Z (35.25)  7.212 2 0.222 2  [0.000503] 2  1.081 u rarrow a R 33189.16 Z
Ginter and Ginter, 1968
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
t' 3Sigmag+ 10psigma [177969]    [8.27] 3      t' rarrow a V 33026.6 Z
Ginter and Ginter, 1968
t 3Pig 9ppi 177027 [1629.15] 4 Z (35.25)  7.212 4 0.230 4  [0.000507] 4  1.081 t rarrow a R 32925.96 Z
Ginter and Ginter, 1968
s' 3Sigmag+ 9psigma [177636]    [8.04] 3      s' rarrow a V 32693.2 Z
Ginter and Ginter, 1968
s 3Pig 8ppi 176658 [1629.30] 5 Z (35.25)  7.213 5 0.2234 5  0.00051 5  1.0806 s rarrow a R 32556.66 Z
Ginter and Ginter, 1968
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
r' 3Sigmag+ 8psigma [177154]    [7.78] 3      r' rarrow a V 32211.7 Z
Ginter and Ginter, 1968
r 3Pig 7ppi 176117 (1700.56) 6 (35.25)  [7.1044] 6 6  [0.000508] 6  [1.0889] r rarrow d R 11625.3 Z
Rosen, 1970
176117          r rarrow a R 32016.56 Z
Ginter and Ginter, 1968
p' 3Sigmag+ 7psigma [176421]    [7.543] 3      p' rarrow a 31478.6 Z
Ginter and Ginter, 1968
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
q 3Deltau 6ddelta [176195]    [7.092] 7   [0.00050] 7  [1.0898] q rarrow c V 20365
Dieke, 1929; Rosen, 1970
           q rarrow b V 26483
Dieke, 1929; Rosen, 1970
q 3Piu 6dpi [(176169)]          q rarrow c R (20330)
Dieke, 1929; Rosen, 1970
           q rarrow b R (26466)
Dieke, 1929; Rosen, 1970
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
q 3Sigmau+ 6dsigma [176120]       [] 7   q rarrow c R 20288
Dieke, 1929; Rosen, 1970
           q rarrow b R 26409
p 3Pig 6ppi 175281 1701.18 Z 35.35  7.220 8 0.224  0.000514  1.0801 p rarrow d R 10788.68 Z
Rosen, 1970
175281          p rarrow a R 31179.93 Z
Ginter and Ginter, 1968
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
o 3Sigmau+ 6ssigma [176001]    [7.109]   [0.00051]  [1.0885] o rarrow c V 20168.8 Z
missing citation
[176001]          o rarrow b R 26290.3 Z
Dieke, Imanishi, et al., 1929; Rosen, 1970
n 3Sigmag+ 6psigma 174389 [1619.52] Z (36.5)  7.4754 9 0.2490  [0.000721] 10  1.0615 n rarrow a 30283.26 Z
Jevons, 1932; Orth and Ginter, 1976
m 3Deltau 5ddelta [174863]    [7.09] 11     [1.091] m rarrow c V (19039)
Rosen, 1970
           m rarrow b V (25152)
Rosen, 1970
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
m 3Piu 5dpi 174778    [7.07] 12      m rarrow c R (18944)
Rosen, 1970
           m rarrow b R (25070)
Rosen, 1970
m 3Sigmau+ 5dsigma [174730]          m rarrow c R 18899
Rosen, 1970
           m rarrow b R 25019
Rosen, 1970
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
l 3Pig 5ppi 173884 [1633.96] 13 Z (35.25)  7.226 13 0.222 13  [0.000512] 13  1.0797 l rarrow d R 9393.9 Z
Rosen, 1970
            29785.31 Z
Ginter and Ginter, 1968
k 3Sigmau+ 5ssigma (173698) [1635.3] Z   7.232 0.23    1.079 k rarrow c V 18683.5 Z
Rosen, 1970
           k rarrow b R 24804.8 Z
Rosen, 1970
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
k' 3Sigmag+ 5psigma 172236 1686.90 Z 38.10  7.379 14 0.349 15  [5.8E-4]  1.0684 k' rarrow a R 28127.58 Z
Orth and Ginter, 1976
j 3Deltau 4ddelta 171573 1702.24 16Z 35.07  7.2088 16 0.2248 17  5.2E-4 16  1.0810 j rarrow c V 16583.18 16Z
Brown and Ginter, 1973
           j rarrow b V 22704.5 16Z
Brown and Ginter, 1973
j 3Piu 4dpi 171402 1680.94 16 Z 40.81  7.1860 16 0.2296 18  5.4E-4 16  1.0827 j rarrow c R 16400.69 16 Z
Brown and Ginter, 1973
           j rarrow b R 22522.0 16 Z
Brown and Ginter, 1973
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
j 3Sigmau+ 4dsigma 171323 1669.79 19 39.09        j rarrow c R 16316.54 19 Z
Brown and Ginter, 1973
j 3Sigmau+ 4dsigma 20           j rarrow b R 22437.8 19 Z
Brown and Ginter, 1973
i 3Pig 4ppi 171290 [1637.94] 21Z (35.25)  7.242 21 0.223 21  [5.14E-4] 21  1.0785 i rarrow a R 27193.01 Z
Ginter and Ginter, 1968; Rosen, 1970
h 3Sigmau+ 4ssigma (170884) [1637.9] Z   7.264 22 0.23  (5.24E-4)  1.077 h rarrow c V 15870.7 Z
Dieke, Imanishi, et al., 1929; Rosen, 1970; Brown and Ginter, 1973
           h rarrow b R 21992.2 Z
Dieke, Imanishi, et al., 1929; Rosen, 1970; missing citation
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
g 3Sigmag+ 4psigma 167714 [1589.92] Z (41)  7.2207 0.2478  [5.38E-4] 23  1.0801 g rarrow a R 23597.00 Z
Orth and Ginter, 1976
f 3Deltau 3ddelta 166303 1706.82 Z 35.10  7.230 24 0.227 25  [5.26e-4] 26  1.0794 f rarrow c V 11316.06 Z
           f rarrow b V 17437.3 Z
missing citation
f 3Piu 3dpi 165877 27 1661.48 Z 44.79  7.136 24 0.235 28  [5.34E-4] 29  1.0865 f rarrow c 10864.53 Z
Ginter, 1966
           f rarrow b 16985.8 Z
Ginter, 1965; Rosen, 1970
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
f 3Sigmau+ 3dsigma 165685 1635.77 Z 44.41  7.071 24 0.246 30  [5.31E-4] 31  1.0914 f rarrow c R 10659.33 Z
           f rarrow b R 106780.6 Z
e 3Pig 3ppi 165598 1721.22 Z 34.970 32  7.2838 33 0.2215 34  5.22E-4  1.0754 ea lrarrow 35 R 21507.26 Z
Brown and Ginter, 1971
d 3Sigmau+ 3ppi 164479 1728.01 Z 36.13 36  7.342 0.2244 37  5.32E-4  1.0712 d rarrow c V 9502.7 Z
Ginter, 1965
           d rarrow b R V 15623.1 Z
missing citation
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
c 3Sigmag+ 3psigma 155053 1583.85 Z 52.74 38  7.0048 0.3105 39  [5.56E-4] 40  1.0966 c rarrow a R 10889.48 Z
Ginter, 1965, 2
b 3Pig 2ppi 148835 1769.07 Z 35.02 41  7.4473 42 0.2196 43  [5.30E-4] 44  1.0635 b rarrow a R 4768.2 Z
Hepner and Herman, 1956; Gloersen and Dieke, 1965
a 3Sigmau+ 2ssigma 144048 1808.56 Z 38.21 45 46  7.7036 47 0.2281 48  5.56E-4 49  1.0457 (a rarrow X) 144935 50
S 1Pig 8ppi [177515]    (7.21) (0.22)    (1.081) S rarrow A R 30228.6 Z
Rosen, 1970
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
R 1Pig 7ppi [176983]    (7.22) (0.22)    (1.080) R rarrow A R 29696.4 Z
Rosen, 1970
P 1Pig 6ppi [176160]    (7.22) (0.22)    (1.080) P rarrow A R 28873.9 Z
Rosen, 1970
M 1Deltau 5ddelta [(174838)]    [7.09] 51     [1.091] M rarrow B (24050)
Rosen, 1970
M 1Piu 5dpi [(174788)]    [7.07] 52     1.091 M rarrow B (24000)
Rosen, 1970
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
M 1Sigmau+ 5dsigma     [7.07] 52     1.091 M rarrow B (23960)
Rosen, 1970
L 1Pig 5ppi [174794]    (7.23) (0.222)    (1.079) L rarrow A R 27507.8 Z
Rosen, 1970
J 1Deltau 4ddelta [172416]    [7.097] 53   [5.0E-4]  [1.0894] J rarrow C V 14183.90 53 Z
Brown and Ginter, 1973
           J rarrow B V 21627.9 53 Z
Brown and Ginter, 1973
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
J 1Piu 4dpi [172290]    [7.080] 53   [5.4E-4]  [1.0908] J rarrow C 14058.37 53 Z
Brown and Ginter, 1973
           J rarrow B 21502.4 53 Z
Brown and Ginter, 1973
J 1Sigmau+ 4dsigma [172222] 54          J rarrow C R 13990.32 54 Z
Brown and Ginter, 1973
J 1Sigmau+ 4dsigma 55           J rarrow B R 21434.3 54 Z
Brown and Ginter, 1973
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
I 1Pig 4ppi [172266]    (7.242) (0.223)    (1.078) I rarrow A R 24979.6 Z
Rosen, 1970
H 1Sigmau+ 4ssigma [171951]    (7.26) 56 (0.23)    (1.077) H rarrow C V 13719.5 Z
Rosen, 1970; Brown and Ginter, 1973
           H rarrow B R 21163.5 Z
Rosen, 1970; Brown and Ginter, 1973
F 1Deltau 3ddelta 166304 1706.59 Z 35.06  7.230 57 0.225 58  [5.20E-4] 59  1.0794 F rarrow B V 16360.9 Z
Ginter, 1965, 3; Ginter, 1966
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
F 1Piu 3dpi 165971 60 1670.87 Z 20.03  7.156 57 0.235  [5.24E-4] 61  1.0849 F rarrow B 16008.3 Z
Ginter, 1965, 3; Ginter, 1966
F 1Sigmau+ 3dsigma (165813) [1564.25] Z (10)  7.098 57 0.246  [5.21E-4] 62  1.0894 F rarrow B R 15837.5 Z
Ginter, 1965, 3; Ginter, 1966
E 1Pig 3ppi 165911 1721.19 Z 34.76 63  7.2705 64 0.2156 65  5.20E-4  1.0764 E rarrow A R 19476.61 Z
Brown and Ginter, 1971
D 1Sigmau+ 3ssigma 165085 1746.43 Z 35.54  7.365 0.2180 66  5.24E-4 67  1.0694 D rarrow B 68 R V 15161.81 Z
Ginter, 1965, 3
           D rarrow X 69 70 
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
C 1Sigmag+ 3psigma 157415 1653.43 Z 41.04 71  7.052 0.215 72  5.08E-4 73  1.0929 C rarrow A R 10945.50 Z
Ginter, 1965, 2; Rosen, 1970
B 1Pig 2ppi 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 1Sigmau+ 2ssigma 146365 77 1861.33 Z 35.28 78  7.7789 0.2166 79  5.44E-4  1.0406 AX lrarrow 80 147279 81
Tanaka and Yoshino, 1963; Mies and Smith, 1966; Smith, 1967; Chow, Smith, et al., 1971
X 1Sigmag+ 0 82         2.97 83  

Notes

1missing note
2Refers to Pi-. B0(3Pi+) ~ 5.6, strongly affected by l-uncoupling.
3Effective value, strongly affected by l-uncoupling.
4Refers to Pi-. B0(3Pi+) = 5.87, strongly affected by l-uncoupling.
5Refers to Pi-. B0(3Pi+) = 6.13, strongly affected by l-uncoupling.
6Constants refer to Pi-; B0(3Pi+)= 6.375 affected by l-uncoupling. v=1 is perturbed; approximate deperturbed constants for Pi-: B1 = 6.886, DeltaG(1/2) = 1629.7.
7Strong l-uncoupling. The rotational constants Dieke, 1929 refer to the average of Pi- and Delta-.
8Refers to Pi-. B0(3Pi+) = 6.630 affected by l-uncoupling.
9Several small accidental perturbations.
10D1 = 6.82E-4, H0 = 14.2E-8, H1 ~ -26E-8.
11Average of Pi- and Delta- as given by Rosen, 1970.
12Average of Sigma+, Pi+, Delta+ as given by Rosen, 1970.
13Refers to Pi-.
14Several small accidental perturbations.
15missing note
16The vibrational and rotational constants refer to Pi- and Delta- which are less affected by l-uncoupling.
17missing note
18missing note
19Constants refer to N'=1.
20Strongly perturbed by l-uncoupling and by interaction with the h state. 22
21Constants refer to 3Pi-.
22 Brown and Ginter, 1973 give average effective constants for the four interacting components j(3Deltau+, 3Piu+, 3Sigmau+) and h 3Sigmau+.
23H0 = 2.0E-8.
24These constants are corrected for l-uncoupling effects.
25missing note
26D1=5.28E-4, D2=5.50E-4, H0=2.5E-8
27Ab initio calculations of f 3Piu and F 1Piu Browne, 1965, Gupta and Matsen, 1969 yield excellent agreement with the observed constants and confirm the presence of substantial potential maxima; see also Mulliken, 1964.
28missing note
29D1=5.34E-4, D2=5.74E=4, H0=2.9E-8.
30missing note
31D1=5.34E-4, D2=5.45E-4, H0 = 0.91E-8.
32See also 33
33The rotational constants refer to Pi- Brown and Ginter, 1971; B(3Pi-)-B(3Pi+) ~ +0.072. Slightly different constants were given by Dieke and Robinson, 1950 who also derived constants for 3He2.
34missing note
35Observed in absorption in a pulsed discharge Callear and Hedges, 1967.
36missing note
37missing note
38omegaeze = -0.4875.
39alphav= 0.1629(v+1/2)2 - 0.0655(v+1/2)3.
40D1= 5.76E-4, D2= 6.11E-4,...; H0=1.32E-8, H1= -0.40E-8, H2=-5.3E-8,... .
41missing note
42The constants refer to 3Pi- and were derived by Ginter, 1965 from the d, frarrowb bands; B(3Pi-) - B(3Pi+) ~ +0.026 Ginter, 1965. The triplet splitting is partially resolved in the drarrowb bands Ginter, 1965.
43missing note
44D1= 5.34E-4,...; H0= 2.80E-8, H1= 3.60E-8,...
45 Brown and Ginter, 1971
46There 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.
47From 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 lambda = -0.03666 Lichten, McCusker, et al., 1974, Vierima, 1975, gamma= -0.0000808 cm-1 Lichten, McCusker, et al., 1974, Vierima, 1975. An ab initio calculation gives lambda= -0.04089 Beck, Nicolaides, et al., 1974.
48missing note
49He ~ 2.7E-8 Brown and Ginter, 1971.
50Energy of a 3Sigmau+,v=0,N=0 above He(1S) + He(1S), based on D00(He2+)= l9073 cm-1. See also 81
51Average of Pi- and Delta- as given by Rosen, 1970.
52Average of Sigma+, Pi+, Delta+ as given by Rosen, 1970.
53These constants refer to Pi- and Delta- which are less affected by l-uncoupling.
54Refers to N=1.
55Strongly perturbed by l-uncoupling and interaction with H 1Sigmau+. 56
56 Brown and Ginter, 1973 give average effective constants for the four interacting components J(1Deltau+, 1Piu+, 1Sigmau+) and H 1Sigmau+.
57These constants are corrected for l-uncoupling effects.
58missing note
59D1=5.26E-4, H0=2.18E-8.
60Ab initio calculations of f 3Piu and F 1Piu Browne, 1965, Gupta and Matsen, 1969 yield excellent agreement with the observed constants and confirm the presence of substantial potential maxima; see also Mulliken, 1964.
61D1=5.26E-4, H0 = 1.97E-8.
62D1=5.29E-4.
63missing note
64The rotational constants refer to Pi- Brown and Ginter, 1971; B(Pi-)-B(Pi+) ~ + 0.044.
65missing note
66missing note
67missing note
68Franck-Condon factors Zhirnov and Shadrin, 1968.
69The weak maximum near 676 Å in the Hopfield continuum is ascribed by Chow and Smith, 1971 to the transition DrarrowX.
70continuum
71omegaeze= -0.1315. Calculations of Guberman and Goddard, 1972 give a potential hump of 0.22 eV at 2.09 Å; see also Andresen and Kuppermann, 1975 and Guberman and Goddard, 1975.
72missing note
73H0 = 1.72E-8,...
74 Ginter, 1965, 3.
75Be refers to Pi-; B(Pi-)-B(Pi+) = +0.019; gammae = -0.0015 Ginter, 1965, 3, betae = +0.05E-4 Ginter, 1965, 3.
76From Rosen, 1970.
77RKR 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 1Sigmau+ state. Theoretical work by Allison, Browne, et al., 1966, Scott, Greenawalt, et al., 1966, Guberman and Goddard, 1972 gives maxima of 0.084,0.153,0.061 eV, respectively; see also Andresen and Kuppermann, 1975, Guberman and Goddard, 1975.
78 Brown and Ginter, 1971
79 Brown and Ginter, 1971.
80Transitions from the low vibrational levels of A 1Sigmau+ to X 1Sigmag+ gives rise to the Hopfield continuum; see MOLSPEC. 1, 404. Transitions from the high vibrational levels as well as the continuous range of energy levels of A 1Sigmau+ to X 1Sigmag+ give rise to diffuse bands near 600 Å observed in emission Mies and Smith, 1966, Smith, 1967 and absorption Tanaka and Yoshino, 1963, Chow, Smith, et al., 1971 with quite different intensity distribution. See also Tanaka, Jursa, et al., 1958, Chow and Smith, 1971 and Michaelson and Smith, 1970, Mukamel and Kaldor, 1973, Peatman and Wu, 1973. Observed absorption coefficients near 600 Å Chow, Smith, et al., 1971 agree fairly well with those predicted by Sando and Dalgarno, 1971.
81Energy of the v=0,N=0 level of A 1Sigmau+ relative to He(1S) + He(1S), calculated from the corresponding value for a 3Sigmau+ by adding the energy difference Deltav = 2343.91 ± 0.05 cm-1 Miller, Freund, et al., 1975 as determined by Miller, Freund, et al., 1975 from singlet-triplet anticrossings. Optical measurements give Deltav = 2344.1 cm-1 Ginter and Battino, 1970. The relative position of the levels is much more accurately known than their absolute values.
82Repulsive potential with very small well (De = 0.90 meV).
83From differential elastic scattering measurements Farrar and Lee, 1972, Burgmans, Farrar, et al., 1976.
84Average 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.
85Based 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 1Sigmau+) = 2.50 eV Ginter and Brown, 1972.
86Relative to He(1S)+He(1S), i.e. I.P.(He2) = I.P.(He) - D00(He2+). The I.P. for the lowest stable state (a 3Sigmau+) is 4.25297 eV.
87Giving the v=0,N=0 levels (real or hypothetical) of npsigma 3Sigmag+ and nppi 3Pig- relative to 2ssigma 3Sigmau+, v=0, N=0.

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
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Notes

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