| Autor: |
Bocharova I; J. R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, 66503, USA., Karimi R, Penka EF, Brichta JP, Lassonde P, Fu X, Kieffer JC, Bandrauk AD, Litvinyuk I, Sanderson J, Légaré F |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2011 Aug 05; Vol. 107 (6), pp. 063201. Date of Electronic Publication: 2011 Aug 02. |
| DOI: |
10.1103/PhysRevLett.107.063201 |
| Abstrakt: |
The process by which a molecule in an intense laser field ionizes more efficiently as its bond length increases towards a critical distance R(c) is known as charge resonance enhanced ionization (CREI). We make a series of measurements of this process for CO(2), by varying pulse duration from 7 to 200 fs, in order to identify the charge states and time scales involved. We find that for the 4+ and higher charge states, 100 fs is the time scale required to reach the critical geometry ≈ 2.1 Å and <θ(OCO)> ≈ 163° (equilibrium CO(2) geometry is ≈ 1.16 Å and <θ(OCO)> ≈ 172°). The CO(2)(3+) molecule, however, appears always to begin dissociation from closer than 1.7 Å indicating that dynamics on charge states lower than 3+ is not sufficient to initiate CREI. Finally, we make quantum ab initio calculations of ionization rates for CO(2) and identify the electronic states responsible for CREI. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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