Comparison Study of Atomic and Molecular Single Ionization in the Multiphoton Ionization Regime
- Institute of Optics, University of Rochester, Rochester, New York 14627 (United States)
In this Letter, we report, for the first time in the multiphoton ionization regime, a comparison study of single-electron ionization of diatomic molecules versus rare gas atoms with virtually the same ionization potentials. In comparing N{sub 2}{sup +} to Ar{sup +}, a higher ion signal is seen in N{sub 2}{sup +} compared to Ar{sup +} for linear polarization but the difference vanishes in circularly polarized light. In comparing O{sub 2}{sup +} to Xe{sup +}, we observe a suppression in O{sub 2}{sup +} compared to Xe{sup +} for both linear and circular polarization but this suppression exhibits an intensity dependence; i.e., there is little suppression for O{sub 2}{sup +} at the lowest intensity range, but the suppression becomes increasingly stronger as the laser intensity increases. The multielectron screening model is used to discuss possible mechanisms of this intensity dependent suppression in O{sub 2}{sup +} in the multiphoton ionization regime.
- OSTI ID:
- 20777293
- Journal Information:
- Physical Review Letters, Vol. 96, Issue 24; Other Information: DOI: 10.1103/PhysRevLett.96.243002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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