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Ivanov, Igor
초강력 레이저과학 연구단
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Instantaneous ionization rate as a functional derivative

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Title
Instantaneous ionization rate as a functional derivative
Author(s)
Ivanov, Igor; Hofmann, C.; Ortmann, L.; Landsman, A. S.; Chang Hee Nam; Kyung Taec Kim
Publication Date
2018-11
Journal
Communications Physics, v.1
Publisher
NATURE PUBLISHING GROUP
Abstract
The notion of the instantaneous ionization rate (IIR) is often employed in the literature for understanding the process of strong field ionization of atoms and molecules. This notion is based on the idea of the ionization event occurring at a given moment of time, which is difficult to reconcile with the conventional quantum mechanics. We describe an approach defining instantaneous ionization rate as a functional derivative of the total ionization probability. The definition is based on physical quantities, such as the total ionization probability and the waveform of an ionizing pulse, which are directly measurable. The definition is, therefore, unambiguous and does not suffer from gauge non-invariance. We compute IIR by numerically solving the time-dependent Schrodinger equation for the hydrogen atom in a strong laser field. In agreement with some previous results using attoclock methodology, the IIR we define does not show measurable delay in strong field tunnel ionization.
URI
https://pr.ibs.re.kr/handle/8788114/9741
DOI
10.1038/s42005-018-0085-5
ISSN
2399-3650
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > 1. Journal Papers (저널논문)
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