摘要Twenty-five new R-branch lines of the v2 (1- ←0+) band of H3O+ are measured using diode laser velocity modulation spectroscopy between 1070 and 1230 cm-1. The H3O+ ions are produced in a high voltage ac discharge with water diluted in helium. The observed lines together with all the previously published measurements are fit to the standard vibration-rotational Hamiltonian of an oblate symmetric top, yielding a set of improved molecular constants. All the sextic centrifugal distortion constants for both 0+ and 1- states are determined precisely. The observed R(13, 0) transition is shifted about -0.129cm-1 from its calculated value, indicating that a near degeneracy exists between the (13, 0)+ and (13, 3)- ground-state rotation-inversion levels.
Abstract：Twenty-five new R-branch lines of the v2 (1- ←0+) band of H3O+ are measured using diode laser velocity modulation spectroscopy between 1070 and 1230 cm-1. The H3O+ ions are produced in a high voltage ac discharge with water diluted in helium. The observed lines together with all the previously published measurements are fit to the standard vibration-rotational Hamiltonian of an oblate symmetric top, yielding a set of improved molecular constants. All the sextic centrifugal distortion constants for both 0+ and 1- states are determined precisely. The observed R(13, 0) transition is shifted about -0.129cm-1 from its calculated value, indicating that a near degeneracy exists between the (13, 0)+ and (13, 3)- ground-state rotation-inversion levels.
(Rotation, vibration, and vibration-rotation constants)
引用本文:
ZHENG Rui;WANG Rui-Bo;LI Song;HUANG Guang-Ming;DUAN Chuan-Xi. Extended Measurement of the v2 (1- ←0+) Band of H3O+ by Mid-Infrared Diode Laser Spectroscopy[J]. 中国物理快报, 2007, 24(9): 2569-2571.
ZHENG Rui, WANG Rui-Bo, LI Song, HUANG Guang-Ming, DUAN Chuan-Xi. Extended Measurement of the v2 (1- ←0+) Band of H3O+ by Mid-Infrared Diode Laser Spectroscopy. Chin. Phys. Lett., 2007, 24(9): 2569-2571.
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