Above-threshold ionization in neon produced by combining optical and bichromatic XUV femtosecond laser pulses

Douguet, Nicolas; Grum–Grzhimailo, A. N.; Bartschat, Klaus

doi:10.1103/physreva.95.013407

Cited by 9 publications

(12 citation statements)

References 63 publications

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“…For this reason, neon has been systematically used to test new many-body theoretical methods. More recently, due to the recent advances in the generation of shorter and shorter pulses and the possibility to track electron wave-packet dynamics in real time, there has been a renewed interest in this system [58][59][60][61][62] that calls for additional theoretical effort.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…( 4) perturbatively. A second-order approximation is suitable to manipulate quantum interferences between conventional opposite-parity pathways to control the anisotropy of photoelectron emission [16][17][18][19]. It can also describe the necessary dynamics of same-parity (two-photon) pathways [24].…”

Section: B Electron Dynamics: Time-dependent Perturbative Treatmentmentioning

confidence: 99%

“…However, at light sources where it is impractical to perform coincidence experiments, or in systems of growing complexity where alignment or analysis of the fragmentation is difficult, complementary methods are required to obtain sensitive, differential information. The anisotropic photoelectron distributions induced by breaking parity symmetry are one example of a possible complementary technique [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In the photoelectron circular dichroism (PECD) technique [9,13,[25][26][27][28][29][30][31][32][33], chiral molecules are used to break parity symmetry, and the differential photoelectron angular distribution (PAD) for ionization by left and right circularly polarized light is measured.…”

Section: Introductionmentioning

confidence: 99%

Perfect control of photoelectron anisotropy for randomly oriented ensembles of molecules by XUV REMPI and polarization shaping

Goetz

Koch

Greenman

2019

The Journal of Chemical Physics

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We report two schemes to generate perfect anisotropy in the photoelectron angular distribution of a randomly oriented ensemble of polyatomic molecules. In order to exert full control over the anisotropy of photoelectron emission, we exploit interferences between single-photon pathways and a manifold of resonantly-enhanced two-photon pathways. These are shown to outperform nonsequential (ω, 2ω) bichromatic phase control for the example of CHFClBr molecules. We are able to optimize pulses that yield anisotropic photoelectron emission thanks to a very efficient calculation of photoelectron momentum distributions. This is accomplished by combining elements of quantum chemistry, variational scattering theory, and time-dependent perturbation theory.

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“…So this scheme should be based on a four-wave-mixing process. Below we consider an experimental technique where the gas having the resonant transition is irradiated with the two replicas of the attosecond train and a (relatively weak) IR field (note that ionization by combining optical and bichromatic XUV pulses was considered recently in [50]). A pair of high harmonics and IR field generate the UV at the frequency of a loworder harmonic as it is shown in the inset to figure 6 with green and orange arrows.…”

Section: Four-wave Mixingmentioning

confidence: 99%

Method of XUV attosecond pulse characterization using two-photon resonant Raman-type transition

2018

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We suggest a new method of attosecond pulse train measurement based on two-photon Raman-type resonant interaction of the XUV with an atom (Attosecond pulse reconstruction using Raman-type Transitions, ART). We show analytically and numerically that the attosecond pulse auto-correlation function and chirp can be measured using this process. Its resonant nature allows obtaining reasonable signal even for relatively low XUV intensity. The interpretation of the results is remarkably simple for the XUV generated by bi-circular field. The experimental realization of the method can be based either on measuring the excitation of the gas or on four-wave mixing fully optical scheme.We suppose that the parity of the states is such that a two-photon transition from the ground to the excited state is allowed. Transitions to other bound states are assumed to be non-resonant and so they can be neglected.

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Above-threshold ionization in neon produced by combining optical and bichromatic XUV femtosecond laser pulses

Cited by 9 publications

References 63 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

Perfect control of photoelectron anisotropy for randomly oriented ensembles of molecules by XUV REMPI and polarization shaping

Method of XUV attosecond pulse characterization using two-photon resonant Raman-type transition

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