Strong Field Ionization Rate for Arbitrary Laser Frequencies
S.V. Popruzhenko, V.D. Mur, V.S. Popov, D. Bauer
TL;DR
This paper derives a simple analytical formula for ionization rates of atoms and ions in intense UV and x-ray fields, valid across all Keldysh parameters, and confirms its accuracy with numerical solutions, aiding FEL experiments.
Contribution
It introduces a novel, analytical ionization rate formula applicable at any Keldysh parameter, validated by numerical simulations.
Findings
The formula accurately predicts ionization rates across different laser frequencies.
Validation against numerical solutions confirms the formula's reliability.
Applicable to experiments with free electron laser sources.
Abstract
A simple, analytical, nonrelativistic ionization rate formula for atoms and positive ions in intense ultraviolet and x-ray electromagnetic fields is derived. The rate is valid at arbitrary values of the Keldysh parameter and confirmed by results from ab initio numerical solutions of the single active electron, time-dependent Schroedinger equation. The proposed rate is particularly relevant for experiments employing the new free electron laser (FEL) sources under construction worldwide.
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