Direct and sequential ejection of the two valence electrons of beryllium by ultrashort laser pulses with photon energies below 18.2 eV
| Autor: | Stéphane Laulan, Samira Barmaki, Marc-André Albert |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Photon Double ionization General Physics and Astronomy chemistry.chemical_element 01 natural sciences 010305 fluids & plasmas Schrödinger equation symbols.namesake Ultrashort laser chemistry Ionization 0103 physical sciences Atom symbols Atomic physics Beryllium 010306 general physics Valence electron |
| Zdroj: | Canadian Journal of Physics. 95:900-904 |
| ISSN: | 1208-6045 0008-4204 |
| DOI: | 10.1139/cjp-2017-0082 |
| Popis: | We investigate the two-photon double ionization of a beryllium atom by intense ultrashort laser pulses. We apply a nonperturbative approach to solve the time-dependent Schrödinger equation. We treat the atom as a two-active-electron system with two outer electrons in the field of a frozen core that includes the nucleus and the electrons of the 1s2 inner shell. We trigger the ionization with photon energies lower than the second ionization potential Ip(Be+(2s)) = 18.2 eV of the atom so that the 2s2 valence shell electrons can be directly ejected in the double continuum or sequentially ejected via excitation ionization through the Be+(2p) ion. We investigate, for various photon energies, the contribution of each of the direct and sequential processes to the ionization dynamic. |
| Databáze: | OpenAIRE |
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