Silylidyne cation

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: Klaus P. Huber and Gerhard H. Herzberg

Data collected through August, 1977

Symbols used in the table of constants
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+
A 1Π 25846.1 [390.17] Z (72.0) 1  4.9125 2 0.7667  [19.92E-4] 3  1.8782 A → X 4 5 R 25025.20 Z
Douglas and Lutz, 1970; missing citation
X 1Σ+ 0 2157.17 Z 34.24  7.6603 0.2096 .00455 3.83E-4 -5E-6 1.5041  


1Estimated from Pekeris' relation Douglas and Lutz, 1970.
2From average Bv values for the two Λ-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 ≥ 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 1Π 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 [5] of Douglas and Lutz, 1970 contain several errors which were later corrected in an unpublished erratum.


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

Douglas and Lutz, 1970
Douglas, A.E.; Lutz, B.L., Spectroscopic identification of the SiH+ molecule: the A 1π-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]


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