Charge Resonance Enhanced Ionization of CO2 Probed by Laser Coulomb Explosion Imaging

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Title Charge Resonance Enhanced Ionization of CO2 Probed by Laser Coulomb Explosion Imaging
Author Bocharova, Irina; Karimi, Reza; Penka, Emmanuel F.; Brichta, Jean-Paul; Lassonde, Philippe; Fu, Xiquan; Kieffer, Jean-Claude; Bandrauk, Andre´ D.; Litvinyuk, Igor; Sanderson, Joseph; Légaré, François
Journal Name Physical Review Letters
Year Published 2011
Place of publication United States
Publisher American Physical Society
Abstract The process by which a molecule in an intense laser field ionizes more efficiently as its bond length increases towards a critical distance Rc is known as charge resonance enhanced ionization (CREI). We make a series of measurements of this process for CO2 , 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 þ and higher charge states, 100 fs is the time scale required to reach the critical geometry hRCO i �� 2:1 �� A and h��OCO i �� 163�� (equilibrium CO2 geometry is hRCO i �� 1:16 �� A and h��OCO i �� 172�� ). The CO2 3 þ molecule, however, appears always to begin dissociation from closer than 1.7 A˚ indicating that dynamics on charge states lower than 3 þ is not sufficient to initiate CREI. Finally, we make quantum ab initio calculations of ionization rates for CO2 and identify the electronic states responsible for CREI.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1103/PhysRevLett.107.063201
Volume 107
Issue Number 6
Page from 063201-1
Page to 063201-5
ISSN 1079-7114
Date Accessioned 2011-08-08; 2012-02-16T05:32:42Z
Date Available 2012-02-16T05:32:42Z
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Atomic and Molecular Physics
URI http://hdl.handle.net/10072/42781
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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