Anomalous high harmonic generation cutoff of O2 molecule
Bing Shan, X. M. Tong, Z. X. Zhao, C. D. Lin, Zenghu Chang
James R. Macdonald Laboratory, Kansas State University
The high harmonic generation (HHG) from O2 molecule and Xe atom is compared experimentally. Even though they have almost identical ionization potential (12.06 eV for O2 and 12.13 eV for Xe), the HHG cutoff order of O2 (43th) was found to be almost twice higher than Xe(25th). The experiments were carried out with a 20fs kHz laser, the Kansas Light Source. We believe that this higher HHG cutoff for O2 is related to the well-known ionization suppression of O2 as compared to Xe. While the mechanism of ionization suppression for some molecules is still under debate, the extension of HHG cutoff in O2 can be explained by the nonadiabatic ionization potential model of Guo  where the effective ionization potential of O2 was estimated to be at 16.9 eV. Further simulations and theoretical calculations to test this model are underway.
 C. Guo, Phys. Rev. Lett. 85, 2276 (2000).
This work was supported by the
Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.
Submitted to DAMOP 2002, May 2002 in Williamsburg, VA.
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