I. Kleiner,1
M. Godefroid,1
M. Herman,1
and A. R. W. McKellar2
1Laboratoire de Chimie Physique Moleculaire CP. 160, Universite Libre de Bruxelles, Avenue F.D. Roosevelt 50, 1050 Brussels, Belgium
2Herzberg Institute of Astrophysics, National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
I. Kleiner is a research assistant, M. Godefroid a research associate, and M. Herman a senior research associate with the National Fund for Scientific Research (FNRS), Belgium.
Intracavity laser Stark experiments were performed on the ν2 fundamental band of nitric acid, HNO3, using a CO laser. Despite the high density of observed resonances in the spectra, it was possible to recognize and fit several transitions. Calculations were made using a theoretical approach describing the Stark effect in asymmetric-topped molecules in terms of tensorial elements. The main result of the analysis was the first reported determination of the a and b components of the electric-dipole moment in the ν2 = 1 vibrational level.
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The TME values, which were the quantities minimized in the least- squares-fitting procedure, correspond to the offset between the energy position of the upper M level, calculated with the fixed parameters (Elower + lower Stark shift + νCO) and determined from the fitted parameters (Eupper + upper Stark shift + Δν); σTME = 9 MHz.
The TME values, which were the quantities minimized in the least- squares-fitting procedure, correspond to the offset between the energy position of the upper M level, calculated with the fixed parameters (Elower + lower Stark shift + νCO) and determined from the fitted parameters (Eupper + upper Stark shift + Δν); σTME = 9 MHz.