Vibrational excitation of CO molecules by infrared free electron laser

Y. Ogi, T. Endo, K. Tsukiyama, H. Kondoh, K. Tono, Y. Ogawa, Y. Hamada, T. Ohta, H. Kuroda

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)67-73
Number of pages7
JournalJournal of Electron Spectroscopy and Related Phenomena
Issue number1
Publication statusPublished - 2003 Jan
Externally publishedYes


  • CO
  • Free electron laser
  • Vibrational excitation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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