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Iodosilylidyne


Gas phase thermochemistry data

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

Quantity Value Units Method Reference Comment
Deltafgas313.63kJ/molReviewChase, 1998Data last reviewed in December, 1976
Quantity Value Units Method Reference Comment
gas,1 bar253.85J/mol*KReviewChase, 1998Data last reviewed in December, 1976

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. - 1200.1200. - 6000.
A 48.9021739.76691
B -19.02582-0.555238
C 12.94843-0.047700
D -3.0852370.064392
E -0.468319-0.206919
F 298.2150301.9459
G 315.5217302.6530
H 313.6293313.6293
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in December, 1976 Data last reviewed in December, 1976

Constants of diatomic molecules

Go To: Top, Gas phase thermochemistry data, 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 September, 1977

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 28Si127I
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
Unassigned bands in the region 41500 - 43600 cm-1.
Olddershaw and Robinson, 1972
F           F larrow X1 V 44995 H
missing citation
(E) 1           (E larrow X) (44104)
missing citation
D           D larrow X1 V 42859 H
missing citation
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
C 42711 486 H 3.5        C larrow X1 V 42772 H
missing citation
B 2Sigma 32380.3 471.7 H 0.9        B larrow X1 V 32434.3 H
Oldershaw and Robinson, 1968; missing citation
A 2Sigma 21204.9 208.6 H 1.66 2 0.079 3      A larrow X1 R 21127.2 H
missing citation
a (4Sigma1/2-) x + 20289.7 275.7 H 5.6  [(0.118)] 4     [(2.50)] a lrarrow X2 5 R 20246.9 H
missing citation; missing citation
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
X2 2Pi3/2 x 6 359.0 H 1.1         
X1 2Pi1/2 0 363.8 H [(1.25)] 7       [(2.45)]  

Notes

1Diffuse bands, assignment uncertain.
2omegaeze = -0.0055.
3Only the 7-0 and 8-0 bands of A larrow X1 have been analyzed Billingsley, 1972, B' ~ 0.085 Billingsley, 1972. Of the six expected branches only four have been observed; R11 and Q P 21 (i.e. Ree and Pff) lines are absent. Extensive perturbations by levels of a 4Sigma1/2- state; see 4.
4As a full rotational analysis of the emission bands [called A' rarrow X by Billingsley, 1972 and A rarrow X by Lakshminarayana and Haranath, 1970] was not possible, the nature of the a state is not known. Billingsley, 1972 suggests that this is the same 4Sigma1/2- state whose higher vibrational levels (DeltaG ~ 176, B ~ 0.097) have been identified in perturbations of A 2Sigma(v=7,8).
5A much weaker system reported by Lakshminarayana and Haranath, 1970 at 650 cm-1 to the red of the main system was not confirmed by Billingsley, 1972. Transitions to or from X1 2Pi1/2 have not been observed.
6 Billingsley, 1972 assumes x ~ 700 cm-1 Billingsley, 1972. Tentative assignments of weak absorption bands would give x=649 cm-1 Billingsley, 1972 or x=757 cm-1 Oldershaw and Robinson, 1968.
7Estimated by assuming the same percentage decrease in bond length from HSiI to SiI as from HSiCl to SiCl Billingsley, 1972. The rotational analysis of the A larrow X1 7-0 and 8-0 bands gives B"- |p"|/2 = 0.10987 and D"= 2.1E-7.
8Extrapolation of the vibrational levels in A2Sigma Billingsley, 1972. An upper limit of 4.02 eV follows from the predissociation in B 2Sigma.
9The bands become progressively more diffuse with increasing v' Billingsley, 1972.

References

Go To: Top, Gas phase thermochemistry data, 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Olddershaw and Robinson, 1972
Olddershaw, G.A.; Robinson, K., Ultraviolet spectra of GeI and SiI: lower wavelength bands, J. Mol. Spectrosc., 1972, 44, 602. [all data]

Oldershaw and Robinson, 1968
Oldershaw, G.A.; Robinson, K., Ultra-violet absorption spectra of GeI and SiI, Trans. Faraday Soc., 1968, 64, 2256. [all data]

Billingsley, 1972
Billingsley, J., The absorption and emission spectrum of silicon monoiodide, J. Mol. Spectrosc., 1972, 43, 3, 128-147. [all data]

Lakshminarayana and Haranath, 1970
Lakshminarayana, A.; Haranath, P.B.V., The emission band spectrum of silicon monoiodide, J. Phys. B:, 1970, 3, 4, 576-579. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, References