TY - JOUR
T1 - Axis-switching and coriolis coupling inthe AÃ(010)-X˜(000) transitions of DCCl and HCCl
AU - Lin, Ao
AU - Kobayashi, Kaori
AU - Yu, Hua Gen
AU - Hall, Gregory E.
AU - Muckerman, James T.
AU - Sears, Trevor J.
AU - Merer, Anthony J.
PY - 2002/1/1
Y1 - 2002/1/1
N2 - The rotationally resolved Ã(010)-X̃(000) spectrum of DCCl between 12 880 and 12 964 cm-1 was measured using frequency-modulated laser absorption spectroscopy of jet-cooled and ambient temperature samples. Transitions to levels with Ka′ = 0 and 1 were assigned, and their analysis leads to improved accuracy of both the ground state rotational constants of DCCl and, when combined with existing data for HCCl, the geometry of the radical. In addition to the expected perpendicular band structure, a number of parallel (ΔKa = 0) subbands were observed. Their intensity derives from a combination of c-type Coriolis coupling and axis-switching (J. T. Hougen and J. K. G. Watson, 1965, Can. J. Phys. 43, 298) resulting from the change in geometry between the two states. The two contributions have been calculated for the (010)-(000) band of DCCl and previously recorded data for HCCl. Satisfactory agreement with experimental measurements was obtained. The Coriolis contributions are small for these transitions, but may add to or subtract from the axis-switching. For higher bending excitation in the upper state, Coriolis coupling is predicted to make larger contributions to the parallel subband intensities.
AB - The rotationally resolved Ã(010)-X̃(000) spectrum of DCCl between 12 880 and 12 964 cm-1 was measured using frequency-modulated laser absorption spectroscopy of jet-cooled and ambient temperature samples. Transitions to levels with Ka′ = 0 and 1 were assigned, and their analysis leads to improved accuracy of both the ground state rotational constants of DCCl and, when combined with existing data for HCCl, the geometry of the radical. In addition to the expected perpendicular band structure, a number of parallel (ΔKa = 0) subbands were observed. Their intensity derives from a combination of c-type Coriolis coupling and axis-switching (J. T. Hougen and J. K. G. Watson, 1965, Can. J. Phys. 43, 298) resulting from the change in geometry between the two states. The two contributions have been calculated for the (010)-(000) band of DCCl and previously recorded data for HCCl. Satisfactory agreement with experimental measurements was obtained. The Coriolis contributions are small for these transitions, but may add to or subtract from the axis-switching. For higher bending excitation in the upper state, Coriolis coupling is predicted to make larger contributions to the parallel subband intensities.
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U2 - 10.1006/jmsp.2002.8594
DO - 10.1006/jmsp.2002.8594
M3 - Article
AN - SCOPUS:0036025866
VL - 214
SP - 216
EP - 224
JO - Journal of Molecular Spectroscopy
JF - Journal of Molecular Spectroscopy
SN - 0022-2852
IS - 2
ER -