Ionic dynamics underlying strong-field dissociative molecular ionization

Ionic dynamics underlying strong-field dissociative molecular ionization We study strong-field molecular ionization, with a focus on indirect ionization to dissociative excited ionic states. Indirect ionization, also known as post-ionization excitation, refers to the excitation of the molecular cation following ionization to a lower-lying state. We propose two possible mechanisms underlying indirect ionization: resonant transitions facilitated by nuclear dynamics and nonadiabatic transitions driven by the laser field off resonance. We compare them by measuring the dependence of the indirect ionization yield on pulse duration for cations with different electronic structures. Both experiments and simulations confirm the importance of nuclear dynamics in indirect ionization and indicate the presence of off-resonant nonadiabatic transitions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Ionic dynamics underlying strong-field dissociative molecular ionization

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Ionic dynamics underlying strong-field dissociative molecular ionization

Abstract

We study strong-field molecular ionization, with a focus on indirect ionization to dissociative excited ionic states. Indirect ionization, also known as post-ionization excitation, refers to the excitation of the molecular cation following ionization to a lower-lying state. We propose two possible mechanisms underlying indirect ionization: resonant transitions facilitated by nuclear dynamics and nonadiabatic transitions driven by the laser field off resonance. We compare them by measuring the dependence of the indirect ionization yield on pulse duration for cations with different electronic structures. Both experiments and simulations confirm the importance of nuclear dynamics in indirect ionization and indicate the presence of off-resonant nonadiabatic transitions.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1050-2947
eISSN
1094-1622
D.O.I.
10.1103/PhysRevA.96.023404
Publisher site
See Article on Publisher Site

Abstract

We study strong-field molecular ionization, with a focus on indirect ionization to dissociative excited ionic states. Indirect ionization, also known as post-ionization excitation, refers to the excitation of the molecular cation following ionization to a lower-lying state. We propose two possible mechanisms underlying indirect ionization: resonant transitions facilitated by nuclear dynamics and nonadiabatic transitions driven by the laser field off resonance. We compare them by measuring the dependence of the indirect ionization yield on pulse duration for cations with different electronic structures. Both experiments and simulations confirm the importance of nuclear dynamics in indirect ionization and indicate the presence of off-resonant nonadiabatic transitions.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Aug 2, 2017

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