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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.

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Title: Ionization Transition Rates in the Intermediate Regime of the Keldysh Parameter for a (0, 1)*LG Spiral Amplitude Modulated Laser Field.
Authors: Miladinović, T. B.1 (AUTHOR) tanja.miladinovic@uni.kg.ac.rs, Simić, S.2 (AUTHOR), Danilović, N.2 (AUTHOR)
Source: Journal of Experimental & Theoretical Physics. Jun2023, Vol. 136 Issue 6, p690-698. 9p.
Subjects: Multiphoton ionization, Multiphoton processes, Stark effect, Ionization energy, Noble gases, Laser pulses, Lasers, Laser beams
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. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Experimental & Theoretical Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Ionization Transition Rates in the Intermediate Regime of the Keldysh Parameter for a (0, 1)*LG Spiral Amplitude Modulated Laser Field.
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  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Experimental & Theoretical Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1134/S1063776123060080
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        Text: English
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      – SubjectFull: Stark effect
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      – SubjectFull: Ionization energy
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      – SubjectFull: Noble gases
        Type: general
      – SubjectFull: Laser pulses
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      – SubjectFull: Lasers
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      – SubjectFull: Laser beams
        Type: general
    Titles:
      – TitleFull: Ionization Transition Rates in the Intermediate Regime of the Keldysh Parameter for a (0, 1)*LG Spiral Amplitude Modulated Laser Field.
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            – D: 01
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              Text: Jun2023
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