Two-photon ionisation cross section calculations of noble gases: results for Ne and Ar

Moccia, R.; Rahman, N. K.; Rizzo, Antonio

doi:10.1088/0022-3700/16/15/016

Cited by 31 publications

(31 citation statements)

References 24 publications

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“…All in all it seems possible to say that, exactly as in H 2 O, where a fundamental role is played by the intermediate state resonance corresponding to the dissociative 1b 1 →4a 1 state, 4 in H 2 S a huge effect arises from the 2b 1 →6a 1 state at an excitation energy of about 6.6 eV, a single excitation from the outer occupied orbital to an orbital of strong antibonding character. 8 The TPDICS of H 2 S has also strong similarities to the one exhibited by the isoelectronic argon atom in the work of Moccia et al 13 In those calculations an R-matrix approach was employed to obtain properly ␦(E) normalized partial waves and to recover the continuum degeneracy conditions. Much smaller sets of oscillating functions than is now possible with the present computer facilities were employed, and a detailed comparison with the current extended calculations in H 2 S is not easily done.…”

Section: Computations Results and Discussionmentioning

confidence: 87%

Calculation of the differential two-photon ionization cross section of H2S

Cacelli

Carravetta²,

Rizzo³

et al. 1995

The Journal of Chemical Physics

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Differential cross section of nonresonant two-photon ionization of the outer valence shell of H 2 S is computed using ab initio methods for several choices of photon polarization and experimental setup. The theoretical model employed is based on the second-order perturbation theory in the dipole and vertical transition approximations and the calculations are performed adopting a large basis set of L 2 integrable functions. The excitations to intermediate states are described in the random phase approximation, while the final states are described in the static-exchange approximation adopting for the continuum orbitals a K-matrix technique that allows a proper description of the angular distribution of the emitted electrons.

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Section: Computations Results and Discussionmentioning

confidence: 87%

Calculation of the differential two-photon ionization cross section of H2S

Cacelli

Carravetta²,

Rizzo³

et al. 1995

The Journal of Chemical Physics

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“…For our specific case in neon, the f -channel is due to the potential part of the transition amplitude, rather than the resonant part [50,51]. The importance of the f -wave has, indeed, posed problems in previous calculations [66]. The restricted PT employed in our previous work [49] also clearly underestimated the role of two-photon transitions into the f -wave.…”

Section: B Dependence Of the Parameters On The Fundamental Frequencymentioning

confidence: 99%

Quantum coherent control of the photoelectron angular distribution in bichromatic-field ionization of atomic neon

et al. 2018

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We investigate the coherent control of the photoelectron angular distribution in bichromatic atomic ionization. Neon is selected as target since it is one of the most popular systems in current gas-phase experiments with free-electron lasers (FELSs). In particular, we tackle practical questions, such as the role of the fine-structure splitting, the pulse length, and the intensity. Time-dependent and stationary perturbation theory are employed, and we also solve the time-dependent Schrödinger equation in a single-active electron model. We consider neon ionized by a FEL pulse whose fundamental frequency is in resonance with either 2p − 3s or 2p − 4s excitation. The contribution of the nonresonant two-photon process and its potential constructive or destructive role for quantum coherent control is investigated.

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“…While the electron correlations in these two-electron systems are significant, they are much stronger in the heavier rare gases, which are drawing increasing theoretical attention. These include the many-body perturbation theory calculation of the two-photon ionization cross section of argon of Pindzola and Kelly [33], the approximate RPA calculation of the two-photon ionization cross sections of neon and argon of Moccia, Rahman, and Rizzo [34], the transition matrix calculation of the two-photon ionization cross section for argon of Jiang and Starace [35], and the RPA calculation of the two-photon ionization cross section for xenon of L'Huillier and Wendin [36].…”

Section: Electron Correlations Important For Two-photon Ionization Prmentioning

confidence: 99%

Electron Correlation Effects in Nonresonant Multiphoton Ionization Processes

Starace¹

1987

Phys. Scr.

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The role of electron correlations in nonresonant multiphoton processes of atoms is presented. The evidence for the validity of a lowest order perturbation theory (LOPT) approach for the laser field in the case of nonresonant processes is sketched. The growing consensus for a LOPT interpretation of even the multiply-charged ion spectra obtained with high intensity lasers is reviewed. Finally, a review of those specific electron correlation processes within LOPT that are important for the quantitative prediction of two-photon ionization cross sections is presented and some of their effects on calculated generalized cross sections are exhibited.

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Two-photon ionisation cross section calculations of noble gases: results for Ne and Ar

Cited by 31 publications

References 24 publications

Calculation of the differential two-photon ionization cross section of H2S

Calculation of the differential two-photon ionization cross section of H2S

Quantum coherent control of the photoelectron angular distribution in bichromatic-field ionization of atomic neon

Electron Correlation Effects in Nonresonant Multiphoton Ionization Processes

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