HIGH RESOLUTION LIFE SPECTROSCOPY OF JET-COOLED METHYLCYCLOPENTADIENYL RADICAL, $C_{5}H_{4}CH_{3}$
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Date
1989
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Ohio State University
Abstract
Methyl substitution on the cyclopentadienyl radical introduces two interesting effects: the splitting of the originally degenerate $\bar{X} ^{2}E_{1}{''}$ state in $C_{5}H_{5}$ due to the symmetry breaking and the coupling between the methyl internal rotation and the overall molecular rotation. We have taken rotationally resolved LIF spectra of methylcyclopentadienyl radical (MeCp) in a free jet expansion. Extremely cold ($<1K$) MeCp is produced by photolzing methyleyclopentadiene with a KrF excimer laser in the jet. The band $(29, 764 cm^{-1})$ previously assigned to the electronic origin is resolved into two subbands separated by $-2 cm^{-1}$, with type a and type b rotational structures, respectively. Based on the preliminary analysis, it seems possible that these two subbands are due to transitions from the split-electronic states. Interestingly, the bands that are assigned to He complexes with MeCp also exhibit similar ``two-subband'' structures.
Description
Author Institution: Laser Spectroscopy Facility Department of Chemistry, The Ohio State University