Direct observation of super-excited states in methane created by a femtosecond intense laser field

A. Azarm, H. L. Xu, Y. Kamali, J. Bernhardt, D. Song, A. Xia, Teranishi Yoshiaki, S. H. Lin, F. Kong, S. L. Chin

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Abstract

We report, for the first time, a direct observation of the super-excited states of CH4 in femtosecond intense laser fields using a pump (800 nm)-probe (1338 nm) technique. An unambiguous depletion of the CH (A 2Δ → X2Π) fluorescence signal as a function of the delay time is attributed to the de-excitation of the super-excited states by the probe laser pulse. The lifetime of the super-excited state is measured to be about 160 fs.

Original languageEnglish
Article number225601
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume41
Issue number22
DOIs
StatePublished - 1 Dec 2008

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