Partial-wave decomposition of the Keldysh ionization amplitude
- University of Colorado, Boulder, CO (United States); The Ohio State University, Columbus, OH (United States); JILA and Department of Energy, University of Colorado Boulder
- University of Colorado, Boulder, CO (United States)
We present an alternative way of calculating the Keldysh amplitude, i.e., the length-gauge form of the ionization amplitude in the strong-field approximation. The amplitude is evaluated exactly by expanding it in Fourier components and partial waves. Comparisons of the semianalytic model predictions with results of ab initio numerical simulations of the time-dependent Schrödinger equation for the interaction of electrons in short-range potentials with intense laser light yield excellent agreement, for wavelengths from the single photon to the multiphoton to the tunneling regime. Specifically, for ionization from initial states with higher angular momentum quantum number, e.g., p states, a significant improvement over predictions based on the popular saddle-point approximation is found. Furthermore, the current model rate allows for interpretation of the strong-field ionization process in terms of multiphoton absorption pathways and angular momentum selection rules.
- Research Organization:
- University of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE; National Science Foundation (NSF)
- Grant/Contract Number:
- SC0001771
- OSTI ID:
- 2438482
- Alternate ID(s):
- OSTI ID: 2204425
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 108; ISSN 2469-9926
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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