Abstract
The visible and near-UV emission spectroscopy of methane (CH4) induced
by a femtosecond intense laser field (800 nm, 40 fs, 1014 W/cm2)
is studied. By measuring the decay profiles of the neutral fragment product CH
(A2Δ→X2Π), two reaction pathways, i.e., the electron-ion
recombination through e−+CH+4 and the direct
disintegration of CH+4 are found to be responsible for populating
the electronic excited states of the neutral fragment product CH, which gives rise to
the photoemissions. Our results provide complementary information on previous
understanding of the strong-field-induced photoemission mechanism of CH4
through neutral dissociation of superexcited states.
© 2015 Chinese Laser Press
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