Spectroscopic evidence of jet-cooled o-chloro-alpha-methylbenzyl radical in corona excitation.
We report the first spectroscopic evidence of the o-chloro-alpha-methylbenzyl radical. The electronically hot but jet-cooled o-chloro-alpha-methylbenzyl radical was formed from precursor o-chloro-ethylbenzene seeded in a large amount of inert carrier gas helium, by employing the technique of corona excited supersonic expansion with a pinhole-type glass nozzle. The vibronic emission spectrum was recorded with a long path monochromator in the D(1) --> D(0) electronic transition in the visible region. By comparing the observed spectrum with that of the o-chlorobenzyl radical reported previously, we could easily identify the spectroscopic evidence of the jet-cooled o-chloro-alpha-methylbenzyl radical generated in the corona discharge of o-chloro-ethylbenzene, from which the electronic transition energy and several vibrational mode frequencies in the ground electronic state were accurately determined.
Ahn
Hyeon Geun
HG
Department of Chemistry and The Chemistry Institute of Functional Materials, Pusan National University, Pusan 609-735, Republic of Korea.
Lee
Gi Woo
GW
Lee
Sang Kuk
SK