(a) Spectrum and (b) interferometric autocorrelation (IAC) of the ultrashort laser pulse. The spectrum was not calibrated with the response curve of the detector.
Time-of-flight mass spectra of methane irradiated by different pulse durations and comparable peak laser intensities. (a) and , (b) and , and (c) and . The spectra were normalized to the intensity of the . Please note that the signal of was divided by 4 for laser pulses.
Potential energy surfaces of at different laser intensities and in two opposite laser field directions. The field vector is shown by the arrows: (a) and (b) .
Time-dependent dissociation probability for the C–H bond parallel to the laser polarization direction at different laser intensities.
Field-free potential energy surfaces of .
Time-of-flight mass spectra of irradiated by laser pulse at (a) , (b) , and (c) . The spectra were normalized to the intensity of . The intensities were magnified by 20 for the mass peaks of , , and .
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