Spectral line parameters in the (3 ← 0) overtone band of the HI molecule and line-mixing in the band head |
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Authors: | MO Bulanin AV Domanskaya C Maul |
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Institution: | a V.A. Fock Institute of Physics, St. Petersburg University, Peterhof, 198504 St. Petersburg, Russia b Institut für Physikalische und Theoretische Chemie der Technischen Unversität Braunschweig, D-38106, Braunschweig, Germany |
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Abstract: | The linestrengths, self-pressure broadening and shifting coefficients have been measured for P3 (10)- R3 (12) lines in the second overtone band of hydrogen iodide. A dipole moment function in terms of the reduced nuclear displacement x = (R − Re)/Re is obtained using rotationless dipole matrix elements determined by the Herman-Wallis analysis of the (1, 2, 3 ← 0) HI bands: μ (x) = 0.4471(5) − 0.0770(2)x + 0.547(3)x2 − 1.93(2)x3, in a full agreement with the function proposed previously J. Mol. Spectrosc. 223 (2004) 67]. A close match is demonstrated of the results of most recent relativistic calculations Phys. Chem. Chem. Phys. 6 (2004) 3779] with the spectroscopically derived electric dipole parameters for HI. Line-mixing in the band head is observed, the self-pressure shifting and broadening coefficients for the (3 ← 0) band lines are determined. |
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Keywords: | Infrared Diatomic molecules Linestrengths Dipole moment function Line-mixing Pressure broadening Pressure shift |
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