Spectral line parameters in the (4 ← 0) overtone band and the dipole moment function of HI

We present new measurements of the line strengths in the third vibrational overtone band in pure HI and its mixtures with Ne, Ar, and Xe, and report results of the Herman–Wallis analysis for this band. Significance of the higher-order terms in the polynomial representation of the dipole moment funct...

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Bibliographic Details
Published in:Journal of molecular spectroscopy 2009-07, Vol.256 (1), p.75-79
Main Authors: Domanskaya, A.V., Bulanin, M.O., Kerl, K., Maul, C.
Format: Article
Language:English
Subjects:
Diatomic molecules
Dipole moment function
Infrared spectra
Overtone
Pressure broadening
Pressure shift
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Summary:We present new measurements of the line strengths in the third vibrational overtone band in pure HI and its mixtures with Ne, Ar, and Xe, and report results of the Herman–Wallis analysis for this band. Significance of the higher-order terms in the polynomial representation of the dipole moment function is discussed. It is concluded that the spectroscopic data yield the dipole moment function fully described by a cubic polynomial in powers of the reduced displacement from the equilibrium bond length. In the Padé approximant for the dipole moment function, the vicinity of the saddle point near equilibrium also can be accurately fitted with a cubic polynomial. Pressure line broadening and shifting parameters are reported for mixtures of HI with rare gases.
ISSN:0022-2852
1096-083X
DOI:10.1016/j.jms.2009.02.003