FLUORESCENCE EXCITATION SPECTRUM OF $CCl_{2}$ IN A SUPERSONIC FREE JET
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Date
1989
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Ohio State University
Abstract
Dichlorocarbone $(CC1_{2})$ has been produced in a continuous supersonic free jet by pyrolysis of $(CH_{3})_{3}SICCl_{2}$ seeded in argon using a nozzie heated to $400^{\circ}$C. Laser excitation spectra of several bands of the $A ^{1}B_{1} \leftarrow X ^{1}A_{1}$ electronic system have been obtained for the cold carbone $(\approxeq 20^{\circ}K)$ in the 500-540 nm spectral region. Partial rotational resolution of several $(\nu_{1},\nu_{2},O) \leftarrow (0,0,0)$ progressions has yielded an assignment based on a perpendicular-band of a near-prolate symmetric rotor with clearly assignable $^{R}R_{K} (J)$ band-head structure. Analysis of the band-head positions in conjunction with spectral band shape simulations leads to rotational constant information for the ground vibronic state and the various observed vibrational states of the $^{1}B_{1}$ excited electronic state. Although the data are not complete, they provide reliable inferences to be made about the ground and excited electronic state structures.
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Author Institution: Department of Chemistry, University of Kansas