Details
| Original language | English |
|---|---|
| Article number | 081002 |
| Journal | Journal of Physics B: Atomic, Molecular and Optical Physics |
| Volume | 41 |
| Issue number | 8 |
| Publication status | Published - 3 Apr 2008 |
| Externally published | Yes |
Abstract
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 Schrödinger 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 41, No. 8, 081002, 03.04.2008.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Theory of high-order harmonic generation from molecules by intense laser pulses
AU - Le, Anh Thu
AU - Della Picca, R.
AU - Fainstein, P. D.
AU - Telnov, D. A.
AU - Lein, Manfred
AU - Lin, C. D.
N1 - Funding information: The authors gratefully acknowledge Universiti Putra Malaysia (UPM) for financial support and all members of the Environmental Biotechnology Research Group, UPM for help and guidance. The authors express their deepest gratitude to Professor Dr. Tan Soon Guan for his help in preparing this manuscript.
PY - 2008/4/3
Y1 - 2008/4/3
N2 - 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 Schrödinger 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.
AB - 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 Schrödinger 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.
UR - http://www.scopus.com/inward/record.url?scp=42549149388&partnerID=8YFLogxK
U2 - 10.1088/0953-4075/41/8/081002
DO - 10.1088/0953-4075/41/8/081002
M3 - Article
AN - SCOPUS:42549149388
VL - 41
JO - Journal of Physics B: Atomic, Molecular and Optical Physics
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
SN - 0953-4075
IS - 8
M1 - 081002
ER -