Influence of the helium autoionization structures on the single/double ionization signal |
| |
| Authors: | L.A.A. Nikolopoulos Takashi Nakajima P. Lambropoulos |
| |
| Affiliation: | (1) Institute of Electronic Structure and Laser, FORTH, P.O. Box 1527, Heraklion, Crete 71110, Greece, GR;(2) Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan, JP;(3) Dept. of Physics, Univ. of Crete, P.O. Box 1527, Heraklion, Crete 71110, Greece, GR |
| |
| Abstract: | Calculations of intense field (around 1016 W/cm2) single- and double-ionization processes in helium at XUV wavelengths are presented. The laser wavelength is chosen near the | 2s2p 1 P autoionization structure and the dynamics are explored. Single and double ionization yields, as well as the photoelectron energy spectrum for photon energies around the autoionization structure are calculated. In the case of a pulse of few femtoseconds duration, no significant enhancement of the double ionization yield has been found in tuning the photon frequency around the peak of the resonance. It is also shown that in the case of a long pulse (and hence narrow compared with the relevant autoionization width), the branching ratio of double to single ionization yield can be relatively enhanced by tuning to the absorption minimum of the resonance. Received 19 February 2002 / Received in final form 2 May 2002 Published online 19 July 2002 |
| |
| Keywords: | PACS. 32.80.Rm Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states) – 32.80.Dz Autoionization |
| 本文献已被 SpringerLink 等数据库收录！ |
|
