Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 41, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/41/8/081002
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We show that high-order harmonics generated from molecules by intense laser pulses can be expressed as the product of a returning electron wave packet and the photo-recombination cross section where the electron wave packet can be obtained from the simple strong-field approximation (SFA) or from a companion atomic target. Using these wave packets but replacing the photo-recombination cross sections obtained from SFA or from the atomic target by the accurate cross sections from molecules, the resulting high-order harmonic spectra are shown to agree well with the benchmark results from direct numerical solution of the time-dependent Schrodinger equation, for the case of H(2)(+) in laser fields. The result illustrates that these powerful theoretical tools can be used for obtaining high-order harmonic spectra from molecules. More importantly, the results imply that the photo-recombination cross section extracted from laser-induced high-order harmonic spectra can be used for time-resolved dynamic chemical imaging of transient molecules with temporal resolutions down to a few femtoseconds.
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