Diode laser spectroscopic measurements and theoretical calculations of line parameters of nitrogen-broadened water vapor overtone transitions in the 818-834 nm wavelength region

被引:7
作者
Bandyopadhyay, Amitava
Ray, Biswajit
Ghosh, Pradip N.
Niles, Danielle L.
Gamache, Robert R.
机构
[1] Univ Massachusetts, Dept Environm Earth & Atmospher Sci, Intercampus Grad Sch Marine Sci & Technol, Lowell, MA 01854 USA
[2] Univ Calcutta, Dept Phys, Kolkata 700009, W Bengal, India
基金
美国国家科学基金会;
关键词
N-2-broadening of water vapor; half-width; line shape;
D O I
10.1016/j.jms.2006.12.008
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
Nitrogen-broadened water vapor line parameters of the (2 1 1) <- (0 0 0) overtone band transitions in the 818-834 nm wavelength region are measured by using a tunable diode laser spectrometer. Water vapor is kept at its saturated vapor pressure at room temperature within a sample cell. Use of a balanced detector and a lock-in amplifier helps to increase the detection efficiency and the signal-to-noise ratio. The collisional broadening coefficients are extracted from the fitting of the experimental data by using a standard Voigt line profile. Collisional half-widths of water vapor lines perturbed by nitrogen are evaluated using the complex-valued implementation of the Robert-Bonamy (CRB) formalism. The rotational wave functions and the energy eigenvalues in the (2 1 1) vibrational state of water molecule are assumed on the basis of symmetry properties. Hence the outcome of this work also tests the validity of the theoretical approximations. The experimental data are compared with the corresponding theoretical values and the possible causes of deviation between the two have also been discussed. (c) 2007 Elsevier Inc. All rights reserved.
引用
收藏
页码:10 / 16
页数:7
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