Premium
Dispersed Fluorescence Spectroscopy and Transition Dipole Moment of HCO β 2 A ′‐X̄ 2 A ′
Author(s) -
Chang HuiAn,
Fan YangHsiung,
Chen IChia
Publication year - 1996
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199600033
Subject(s) - chemistry , dipole , atomic physics , transition dipole moment , fluorescence , spectral line , spectroscopy , ground state , moment (physics) , emission spectrum , molecular electronic transition , molecular physics , analytical chemistry (journal) , molecule , optics , physics , organic chemistry , quantum mechanics , astronomy , classical mechanics , chromatography
Dispersed fluorescence spectra of β 2 A′ ‐ x̄ 2 A′ transitions are measured on exciting HCO to the vibrational levels (0,0,0), (0,0,1), (0,1,0) and (1,0,0) of β 2 A′ in a gas cell. Vibrational energies of bound and resonant states are determined for energy up to 17 500 cm −1 from the ground vibrational level of the x̄ 2 A′ state. Rotationally resolved spectra of the bands β 2 A′ ‐ x̄ 2 A′ 2 0 3 3 0 1 , 2 1 4 and 2 0 2 3 1 2 were recorded and analyzed. Abnormal intensities in the P, Q and R branches are due to the mechanism of “axis switching”. From the ratios of emission intensity of a ‐ and b ‐type transitions, without taking into account the varied lifetimes of rotational states of the upper electronic state, the directions of transition dipole moments of these bands are determined to be 39 − 43° to the inertial a axis.