First observation of a Fano profile following one step autoionization into a double photoionization continuum

Journel, L.; Rouvellou, B.; Cubaynes, D.; Bizau, J. M.; Wuilleumier, F. J.; Richter, M.; Sladeczek, P.; Selbmann, K.-H.; Zimmermann, Peter; Bergeron, Hervé

doi:10.1051/jp4:1993621

Cited by 16 publications

(22 citation statements)

References 20 publications

(26 reference statements)

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“…(18)]. For this reason, for each partial cross section, we will fix the parameters already obtained from the fit of the total cross section (E r , , and q) and will only leave three free parameters: Re(α μ ), Im(α μ ), (17), by introducing the new parameters C 1μ and C 2μ [87] defined as…”

Section: Photoionization Of Ne At XCI Levelmentioning

confidence: 99%

Photoionization using the xchem approach: Total and partial cross sections of Ne and resonance parameters above the 2s22p5 threshold

et al. 2017

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The XCHEM approach interfaces well established quantum chemistry packages with scattering numerical methods in order to describe single-ionization processes in atoms and molecules. This should allow one to describe electron correlation in the continuum at the same level of accuracy as quantum chemistry methods do for bound states. Here we have applied this method to study multichannel photoionization of Ne in the vicinity of the autoionizing states lying between the 2s 2 2p 5 and 2s2p 6 ionization thresholds. The calculated total photoionization cross sections are in very good agreement with the absolute measurement of Samson et al.[J. Electron Spectrosc. Relat. Phenom. 123, 265 (2002)], and with independent benchmark calculations performed at the same level of theory. From these cross sections, we have extracted resonance positions, total autoionization widths, Fano profile parameters, and correlation parameters for the lowest three autoionizing states. The values of these parameters are in good agreement with those reported in earlier theoretical and experimental work. We have also evaluated β asymmetry parameter and partial photoionization cross sections and, from the latter, partial autoionization widths and Starace parameters for the same resonances, not yet available in the literature. Resonant features in the calculated β parameter are in good agreement with the experimental observations. We have found that the three lowest resonances preferentially decay into the 2p −1 d continuum rather than into the 2p −1 s one [Phys. Rev. A 89, 043415 (2014)], in agreement with previous expectations, and that in the vicinity of the resonances the partial 2p −1 s cross section can be larger than the 2p −1 d one, in contrast with the accepted idea that the latter should amply dominate in the whole energy range. These results show the potential of the XCHEM approach to describe highly correlated process in the ionization continuum of many-electron systems, in particular molecules, for which the XCHEM code has been specifically designed.

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Section: Photoionization Of Ne At XCI Levelmentioning

confidence: 99%

Photoionization using the xchem approach: Total and partial cross sections of Ne and resonance parameters above the 2s22p5 threshold

et al. 2017

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“…This effect is referred to as the presence of Fano zeros that do not depend on the optical-field strength. Experimental evidence of the Fano zeros has been brought, e.g., in [4]. In general, there exist N Fano zeros in a system with N discrete levels [1].…”

Section: Introductionmentioning

confidence: 99%

Photoionization electron spectra in a system interacting with a neighboring atom

et al. 2011

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Photoelectron ionization spectra of a system interacting with a neighbor two-level atom are investigated using the Laplace-transform method. These spectra are typically composed of several peaks. Photoelectron ionization spectra conditioned by the measurement on the two-level atom show oscillations at the Rabi frequency. The presence of spectral zeros occurring periodically with the Rabi period is predicted. This phenomenon is analyzed in detail.

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“…In this approximation, just two reduced E1 matrix elements J f = 1/2 m α m a 1 1 (r m ) J = 1/2, 3/2 need to be calculated in order to obtain the transition amplitude (4), where we have omitted the electron configurations for the sake of brevity. The two |J = 1/2, 3/2 resonances overlap each other and cannot be resolved spectroscopically [40][41][42][43]. In the computations, we use the experimentally known data 0.199 eV and 66.41 eV for the total linewidth Γ tot and the central excitation energy E exc [43].…”

Section: Resultsmentioning

confidence: 99%

Level sequence and splitting identification of closely spaced energy levels by angle-resolved analysis of fluorescence light

Volotka

Surzhykov

et al. 2016

Phys. Rev. A

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The angular distribution and linear polarization of the fluorescence light following the resonant photoexcitation is investigated within the framework of the density matrix and second-order perturbation theory. Emphasis has been placed on "signatures" for determining the level sequence and splitting of intermediate (partially) overlapping resonances, if analyzed as a function of the photon energy of the incident light. Detailed computations within the multiconfiguration Dirac-Fock method have been performed especially for the 1s 2 2s 2 2p 6 3s Ji = 1/2 + γ1 → (1s 2 2s2p 6 3s)13p 3/2 J = 1/2, 3/2 → 1s 2 2s 2 2p 6 3s J f = 1/2 + γ2 photoexcitation and subsequent fluorescence emission of atomic sodium. A remarkably strong dependence of the angular distribution and linear polarization of the γ2 fluorescence emission is found upon the level sequence and splitting of the intermediate (1s 2 2s2p 6 3s)13p 3/2 J = 1/2, 3/2 overlapping resonances owing to their finite lifetime (linewidth). We therefore suggest that accurate measurements of the angular distribution and linear polarization might help identify the sequence and small splittings of closely-spaced energy levels, even if they can not be spectroscopically resolved.

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First observation of a Fano profile following one step autoionization into a double photoionization continuum

Cited by 16 publications

References 20 publications

Photoionization using the xchem approach: Total and partial cross sections of Ne and resonance parameters above the 2s22p5 threshold

Photoionization using the xchem approach: Total and partial cross sections of Ne and resonance parameters above the 2s22p5 threshold

Photoionization electron spectra in a system interacting with a neighboring atom

Level sequence and splitting identification of closely spaced energy levels by angle-resolved analysis of fluorescence light

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