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Silylidyne cation


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
gas,1 bar186.79J/mol*KReviewChase, 1998Data last reviewed in December, 1971

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 August, 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 28SiH+
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
A 1Pi 25846.1 [390.17] Z (72.0) 1  4.9125 2 0.7667  [19.92E-4] 3  1.8782 A rarrow X 4 5 R 25025.20 Z
Douglas and Lutz, 1970; missing citation
X 1Sigma+ 0 2157.17 Z 34.24  7.6603 0.2096 .00455 3.83E-4 -5E-6 1.5041  

Notes

1Estimated from Pekeris' relation Douglas and Lutz, 1970.
2From average Bv values for the two Lambda-doubling components; B(P,R) - B(Q) = +0.0062, +0.0156 (v=0,1).
3D1= 17.89E-4. In both v=0 and 1, rotational levels having J geq 9 cannot be represented by short power series in J(J+1).
4Also observed in the solar spectrum Grevesse and Sauval, 1970. On the basis of this observation Grevesse and Sauval, 1971 obtain f00 = 0.0005 Grevesse and Sauval, 1971; see, however, Liszt and Smith, 1972.
5Potential functions, Franck-Condon factors Rao and Lakshman, 1971, Liszt and Smith, 1972.
6From a short extrapolation of the vibrational levels in A 1Pi Douglas and Lutz, 1970.
7Table IV as well as eqn. [3] and eqn. [5] of Douglas and Lutz, 1970 contain several errors which were later corrected in an unpublished erratum.

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]

Douglas and Lutz, 1970
Douglas, A.E.; Lutz, B.L., Spectroscopic identification of the SiH+ molecule: the A 1«pi»-X1+ system, Can. J. Phys., 1970, 48, 247. [all data]

Grevesse and Sauval, 1970
Grevesse, N.; Sauval, A.J., Identification of SiH+ in the solar photospheric spectrum, Astron. Astrophys., 1970, 9, 232-238. [all data]

Grevesse and Sauval, 1971
Grevesse, N.; Sauval, A.J., Oscillator strengths for SiH and SiH+ deduced from the solar spectrum, J. Quant. Spectrosc. Radiat. Transfer, 1971, 11, 65. [all data]

Liszt and Smith, 1972
Liszt, H.S.; Smith, W.H., RKR Franck-Condon factors for blue and ultraviolet transitions of some molecules of astrophysical interest and some comments on the interstellar abundance of CH, CH+, and SiH, J. Quant. Spectrosc. Radiat. Transfer, 1972, 12, 947. [all data]

Rao and Lakshman, 1971
Rao, T.V.R.; Lakshman, S.V.J., The true potential energy curves and Franck-Condon factors of SiH and SiH+ molecules, Physica, 1971, 56, 322. [all data]


Notes

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