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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