The Jahn-Teller and related effects in the cyclopentadienyl radical. II. Vibrational analysis of the A-tilde~2A_2''-X-tilde~2E_1'' electronic transition

摘要

The laser excited, jet-cooled A-tilde~2A_2''-X-tilde~2E_1'' electronic spectrum of the cyclopentadienyl radical yields detailed information abouth the vibronic structure of both its A-tilde and X-tilde states. A straightforward assignment of the A-tilde vibronic structure is presented. The X-tilde state vibronic structure reveals a comprehensive picture of the Jahn-Teller distortion of its potential energy surface. The molelcular parameters characterizing the Jahn-Teller interaction provide the stabilization energy and distorted geometry, which are compoared to previous experimental and ab initio results.