2019
DOI: 10.1103/physreva.100.011401
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Fluorescence polarization as a precise tool for understanding nonsequential many-photon ionization

Abstract: Nonsequential two-photon ionization of inner-shell np subshell of neutral atoms by circularly polarized light is investigated. Detection of subsequent fluorescence as a signature of the process is proposed and the dependence of fluorescence degree of polarization on incident photon beam energy is studied. It is generally expected that the degree of polarization remains approximately constant, except when the beam energy is tuned to an intermediate n ′ s resonance. However, strong unexpected change in the polar… Show more

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Cited by 12 publications
(19 citation statements)
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“…An effective potential is also widely used in calculations of multi-photon ionization using solutions of time-dependent Schrödinger equation, which for long pulse lengths are in agreement with time-independent perturbation theory [7]. In our previous work [31], we evaluated the uncertainty in our calculations due to the choice of the screening potential by using a number of different potential models. There are approaches beyond the independent-particle approximation (see, e.g., [4]), however, they are usually applied for ionization by soft XUV photon energies and cannot be applied for deep inner-shell ionization.…”
Section: Resultsmentioning
confidence: 99%
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“…An effective potential is also widely used in calculations of multi-photon ionization using solutions of time-dependent Schrödinger equation, which for long pulse lengths are in agreement with time-independent perturbation theory [7]. In our previous work [31], we evaluated the uncertainty in our calculations due to the choice of the screening potential by using a number of different potential models. There are approaches beyond the independent-particle approximation (see, e.g., [4]), however, they are usually applied for ionization by soft XUV photon energies and cannot be applied for deep inner-shell ionization.…”
Section: Resultsmentioning
confidence: 99%
“…What is more, the Cooper minimum can be found also in many-photon (nonlinear) ionization of atoms and appears between any two adjacent level resonances of the same angular momentum [31]. We have previously shown, that such a nonlinear Cooper minimum enhances the polarization transfer from incident to fluorescence photons [31], and in the case of two-photon K-shell ionization, can uniquely reveal multipole contributions in the two-photon ionization process [32]. Furthermore, we have demonstrated that the maximum of elliptical dichroism in photoelectron angular distributions appears near the nonlinear Cooper minimum [5].…”
Section: Introductionmentioning
confidence: 99%
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“…In practice, however, only a few of these channels (continua) are usually relevant for any non-linear interaction process, either because of the symmetry of the underlying interaction operators or due to further limitations in the theoretical description. For the two-photon excitation and ionization of a electron from neon-like ions [ 5 , 45 ], for example, Figure 1 displays the symmetry channel due to a E1E1 excitation as well as the channel if, in addition, one wishes to account for E1M2 multipole excitations.…”
Section: Theoretical Backgroundmentioning
confidence: 99%
“…There are specific incident photon energies ω between two intermediate level resonances E n n j n < ω < E n ′ n j n for which one of the amplitudes U ( j n ) l j = 0, due to balance of the its spectral contributions 41 . The photon energy, at which the dominant ionisation channels drops to zero, we call nonlinear Cooper minimum, and we will demonstrate that at this energy all possible observables of the two-photon ionisation process are strongly influenced.…”
Section: Two-photon Transition Amplitudementioning
confidence: 99%