EXTENDED MEASUREMENT AND ANALYSIS OF THE V3-INFRARED BAND OF METHANE

被引:60
作者
GRAY, DL [1 ]
ROBIETTE, AG [1 ]
PINE, AS [1 ]
机构
[1] MIT,LINCOLN LAB,LEXINGTON,MA 02173
基金
美国国家科学基金会;
关键词
D O I
10.1016/0022-2852(79)90183-8
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
Previous Doppler-limited measurements of the allowed lines in the ν3 infrared band of 12CH4, recorded using a stabilized difference-frequency tunable infrared laser system, have been extended to P(17), Q(17), and R(19). The data have been analyzed by diagonalization of an effective Hamiltonian for the v3 = 1 state, in which many higher-order terms (including tensor operators of up to eighth rank) have been added to the usual fourth-order expansion. These extra terms are necessary to reproduce the experimental splitting patterns and in particular to fit an unusual inversion of the ordering of the tetrahedral levels for R = J - 1 around J = 14 in the upper state. The standard deviation of the fit to 440 assigned transitions is 0.0056 cm-1, and the calculated intensities are also in good agreement with experiment. © 1979.
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页码:440 / 456
页数:17
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