I V Litvinyuk et al 2008 New J. Phys. 10 083011 doi:10.1088/1367-2630/10/8/083011
Wavelength-dependent study of strong-field Coulomb explosion of hydrogen
I V Litvinyuk1,5, A S Alnaser2, D Comtois3, D Ray1, A T Hasan2, J-C Kieffer3 and D M Villeneuve4
Show affiliationsWe present the first systematic wavelength-dependent study of laser Coulomb explosion of deuterium molecules at various peak intensities and polarizations. We measured the kinetic energy spectra of D+ for laser wavelengths in the range 480–2000 nm. In addition to the well-known enhanced ionization channel present for all wavelengths, we observe a new high-energy band at short wavelengths. This new band exhibits wavelength dependence, with fragment energy decreasing with increasing wavelengths until it merges with the enhanced ionization band for 800 nm and longer. We attribute the emergence of this band to a new pathway that involves resonant three-photon coupling to the first excited electronic state of the molecular ion during the Coulomb explosion process. This pathway should be accounted for in controlling molecular dynamics of hydrogen by intense laser pulses.
- PACS
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33.80.Eh Autoionization, photoionization, and photodetachment
33.80.Rv Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states)
- Subjects
- Dates
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Issue 8 (August 2008)
Received 5 June 2008
Published 7 August 2008
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Wavelength-dependent study of strong-field Coulomb explosion of hydrogen
I V Litvinyuk et al 2008 New J. Phys. 10 083011
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