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Ionization Transition Rates in the Intermediate Regime of the Keldysh Parameter for a (0, 1)*LG Spiral Amplitude Modulated Laser Field

  • ATOMS, MOLECULES, OPTICS
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Abstract

The mechanisms of the tunnel and multiphoton ionization transitions of hydrogen-like atoms and noble gas atoms are discussed. Atoms potassium and argon, with ionization energy of 4.34 and 15.76 eV, were chosen as the target. The atoms are exposed to Ti:Sapphire, (0,1)*LG, spiral amplitude modulated, laser beam at λ = 800 nm wavelength in a broad intensity range 1012 to 1015 W/cm2. The computational approach to describe tunnel and multiphoton processes was based on using the ADK theory. Stark and ponderomotive effects are also included to study their influence on the transition rate. Obtained results show that, for the lower γ values, the contribution of multiphoton ionization was less significant than the tunnel ionization contribution. In comparison, for higher γ values, multiphoton ionization dominated over tunnel ionization in a total transition rate. It is found that, in this particular case of spiral amplitude modulated mode, the intermediate regime, where both processes equally contribute, strongly depends on the atom selection and laser field intensity. Ionization in the intermediate regime occurs for γ ≈ 10 and 12 for low laser intensities, as γ ≈ 2 and 2.5 for the higher values, in the case of potassium and argon respectively. Our analysis indicated that the Stark and ponderomotive effects have a significant influence on the total transition rate. It is shown that these effects decrease the transition rate value and move the intermediate regime’s position toward lower values of the γ parameter, mainly in the case of higher laser field intensity.

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ACKNOWLEDGMENTS

The authors acknowledge funding provided by the University of Kragujevac—Institute for Information Technologies (contract 451-03-47/2023-01/200378), University of Kragujevac—Faculty of Science (contract 451-03-47/2023-01/200122) through the grants by the Ministry of Education, Science and Technological Development of the Republic of Serbia.

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Authors and Affiliations

  1. Institute for Information Technologies, University of Kragujevac, 34000, Kragujevac, Serbia

    T. B. Miladinović

  2. Faculty of Science, University of Kragujevac, 34000, Kragujevac, Serbia

    S. Simić & N. Danilović

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  1. T. B. Miladinović
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Miladinović, T.B., Simić, S. & Danilović, N. Ionization Transition Rates in the Intermediate Regime of the Keldysh Parameter for a (0, 1)*LG Spiral Amplitude Modulated Laser Field. J. Exp. Theor. Phys. 136, 690–698 (2023). https://doi.org/10.1134/S1063776123060080

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