This paper describes the vibrational excitation of CO molecules by FEL-SUT (Free Electron Laser at Tokyo University of Science). FEL is tuned to 4.67 μm, corresponding to the X1Σ+(v″ = 1)←(v″ = 0) transition of CO. The population of the vibrationally excited states is probed by the (2 + 1) resonance enhanced multiphoton ionization technique via the B1Σ+ Rydberg state. We find that ∼10% of the population in v″ = 0 is excited to v″ = 1. In spite of the existence of the resonant vibrational ladder climbing channels via specific rotational levels, no signal originating from v″ = 2 is detectable. The predissociation in the B1Σ+(v′ = 2) state is believed to be responsible for the absence of CO+ signals.
|ジャーナル||Journal of Electron Spectroscopy and Related Phenomena|
|出版ステータス||Published - 2003 1|
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