Combination of lasers and synchrotron radiation in studies of atomic photoionization

Meyer, Michael

doi:10.1016/j.nima.2008.12.241

Cited by 8 publications

(6 citation statements)

References 50 publications

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“…This is challenging because the relatively low photon flux of the SR is not well suited to resonant multiphoton schemes, but the technique has been demonstrated in a few cases. [16][17][18] In a recent study of direct relevance to the one reported here, Meyer and coworkers have reported polarization-dependent PADs following the resonant photoionization of Xe atoms which were state-selected by SR and ionized by visible laser radiation. 19,20 In their work, ionization was enhanced through the use of an autoionizing resonance, and only a single ionic state was energetically accessible.…”

Section: Introductionmentioning

confidence: 60%

Effect of electronic angular momentum exchange on photoelectron anisotropy following the two-color ionization of krypton atoms

et al. 2016

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Section: Introductionmentioning

confidence: 60%

Effect of electronic angular momentum exchange on photoelectron anisotropy following the two-color ionization of krypton atoms

et al. 2016

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“…VUV excitation of ground-state rare gases allows one to excite only odd-parity Rydberg states with J = 1 ( ( ) = 0, 2), a broader variety of ARS can be accessed from the ground state by nonresonant two-, three-or four-photon excitation with a single tunable laser [51][52][53][54][55]124]. More selective excitation of ARS is achieved by resonant excitation schemes via low-lying intermediate Rydberg states, using narrow-band synchrotron radiation [56,60,125] or coherent VUV light [62] or a twophoton transition [126] to reach the intermediate level.…”

Section: Multiphoton-excitation Schemes While One-photonmentioning

confidence: 99%

“…It can be measured directly at the 'magic' angle α M = 54.7 • (P 2 (cos α M ) = 0). Polarization-dependent measurements can be exploited to determine the J-specific cross sections, as achieved, for instance, for two-step photoionization of ground state Xe atoms via the 7s[3/2] 1 intermediate level in the energy range of the 8p J = 0, 1, 2 resonances [59,125], see section 5.2.1.…”

Section: Multiphoton-excitation Schemes While One-photonmentioning

confidence: 99%

Photoionization dynamics of excited Ne, Ar, Kr and Xe atoms near threshold

Sukhorukov¹,

Petrov²,

Schäfer³

et al. 2012

J. Phys. B: At. Mol. Opt. Phys.

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A review of experimental and theoretical studies of the threshold photoionization of the heavier rare-gas atoms is presented, with particular emphasis on the autoionization resonances in the spectral region between the lowest two ionization thresholds (mp 5 2 P 3/2 and mp 5 2 P 1/2 , with m = 2, 3, 4, and 5 for Ne, Ar, Kr, and Xe, respectively). Observed trends in the positions, widths, and shapes of the autoionization resonances in dependence of the atomic number, the principal quantum number n, the orbital angular momentum quantum number and further quantum numbers such as K, J and F specifying the fine-and hyperfine-structure levels, are summarized and discussed in the light of ab initio and multichannel quantum defect theory calculations. The dependence of the photoionization spectra on the initially prepared neutral state, e.g. the 1 S 0 ground state, the mp 5 (m + 1)s 3 P 2 and mp 5 (m + 1)s 3 P 0 metastable levels and other states prepared from the ground or metastable levels in single-and multiphoton processes, are also discussed, including results on the photoionization of aligned and oriented samples and on photoelectron angular distributions. The effects of various approximations in the theoretical treatment of photoionization in these systems are analysed. The very large and at first sight discouraging diversity of observed phenomena and the numerous anomalies in spectral structures associated with the threshold ionization of the rare-gas atoms can be described in terms of a limited set of interactions and dynamical processes. Examples are provided illustrating characteristic aspects of the photoionization, and sets of recommended parameters describing the energy-level structure and photoionization dynamics of the rare-gas atoms are presented which were extracted in a critical analysis of the very large body of experimental and theoretical data available on these systems in the literature.

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“…High spectral resolution is achieved in experiments making use of the short-wavelength emission from a synchrotron radiation (SR) storage ring and of the very narrow bandwidth of continuous-wave dye lasers, and enabling thereby the detailed study of a whole plethora of complex electronic excitation and decay processes in state prepared atoms and molecules (e.g. [1,2]). For many photoionization applications, high temporal resolution is provided by attosecond pulses, which are produced via highorder harmonic generation (HHG) of an intense femtosecond infrared laser and open unique access to the ultra-fast dynamics of electronic relaxation (e.g.…”

Section: Introductionmentioning

confidence: 99%

Two-colour experiments in the gas phase

Meyer

Costello

Düsterer³

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. First experiments on atomic photoionization and molecular dissociation have been performed by taking advantage of the unprecedented characteristics of the Free Electron Laser in Hamburg (FLASH) combined with a separate near-infrared (NIR) femtosecond laser. In a series of two-color experiments, the photoionization of rare gases in the presence of a strong NIR dressing field as well as the polarization dependence of this process were investigated systematically. A detailed analysis of the partial cross sections for the two-color two-photon ionization process was carried out for low dressing fields. Higher dressing fields give rise to multi-photon processes, which are observed and analyzed without undesirable interferences, a beneficial consequence of the monochromaticity of the FLASH radiation. The experimental results are compared with theoretical descriptions for two-color above threshold ionization obtained by employing second-order perturbation theory and the "soft-photon" approximation. In addition, complementary information was obtained on the sequential two-photon double ionization of Ne, which was made possible by the short and intense FLASH pulses. As a starting point for future time-resolved studies on molecular dissociation, a proof-of-principle experiment on the hydrogen diatomic system was carried out. In a typical pump-probe arrangement, excited neutral fragments, which were formed during photo-induced dissociation by the FLASH radiation, were identified via single-and multi-photon ionization induced by the time delayed optical laser.

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Combination of lasers and synchrotron radiation in studies of atomic photoionization

Cited by 8 publications

References 50 publications

Effect of electronic angular momentum exchange on photoelectron anisotropy following the two-color ionization of krypton atoms

Effect of electronic angular momentum exchange on photoelectron anisotropy following the two-color ionization of krypton atoms

Photoionization dynamics of excited Ne, Ar, Kr and Xe atoms near threshold

Two-colour experiments in the gas phase

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