A high-resolution FTIR-spectroscopic study of HI gas:

band analysis and the dipolar moment function

A. Domanskaya1*, M. Bulanin1, K. Kerl2

1 V. A. Fock Institute of Physics, St. Petersburg University, Peterhof, 198504 St. Petersburg, Russia

2 Institut für Physikalische und Theoretische Chemie, D-38106 Braunschweig, Germany

* Corresponding author. E-mail: domav@molsp.phys.spbu.ru

Received: 15 October 2003; revised version accepted: 02 November 2004

Abstract

New high-resolution experimental data are reported on the linestrengths and self-pressure-broadened Lorentzian widths for the P1(1)-P1(10), R1(0)-R1(15), and P2(13)- R2(12) vibration-rotation lines in the fundamental and the first overtone absorption bands of HI. An improved dipole moment expansion as a function of the reduced nuclear displacement is generated and compared with the available ab initio calculations. A new set of the Herman - Wallis coefficients is obtained, which is in a better agreement with theory than previously published results.

Keywords: Diatomic molecules; Linestrengths; Dipole moment function; Pressure broadening; Hyperfine structure.

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