Multipeak envelope of the above-threshold-ionization energy spectrum in a strong circularly polarized laser field

Bauer, Jarosław H.

doi:10.1103/physreva.85.063417

Cited by 11 publications

(6 citation statements)

References 28 publications

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“…The angular dependence is stronger in the ATI regime (for elliptical polarization), with double peaks extending through the angle Φ and energy K . This multipeak effect found here for the initial ground state in the ATI case is similar to the multipeak found for the excited states by Bauer 80 .…”

Section: Resultssupporting

confidence: 90%

Effects of ultrashort laser pulses on angular distributions of photoionization spectra

Ooi

Bandrauk

2017

Sci Rep

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We study the photoelectron spectra by intense laser pulses with arbitrary time dependence and phase within the Keldysh framework. An efficient semianalytical approach using analytical transition matrix elements for hydrogenic atoms in any initial state enables efficient and accurate computation of the photoionization probability at any observation point without saddle point approximation, providing comprehensive three dimensional photoelectron angular distribution for linear and elliptical polarizations, that reveal the intricate features and provide insights on the photoionization characteristics such as angular dispersions, shift and splitting of photoelectron peaks from the tunneling or above threshold ionization(ATI) regime to non-adiabatic(intermediate) and multiphoton ionization(MPI) regimes. This facilitates the study of the effects of various laser pulse parameters on the photoelectron spectra and their angular distributions. The photoelectron peaks occur at multiples of 2ħω for linear polarization while odd-ordered peaks are suppressed in the direction perpendicular to the electric field. Short pulses create splitting and angular dispersion where the peaks are strongly correlated to the angles. For MPI and elliptical polarization with shorter pulses the peaks split into doublets and the first peak vanishes. The carrier envelope phase(CEP) significantly affects the ATI spectra while the Stark effect shifts the spectra of intermediate regime to higher energies due to interference.

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Section: Resultssupporting

confidence: 90%

Effects of ultrashort laser pulses on angular distributions of photoionization spectra

Ooi

Bandrauk

2017

Sci Rep

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“…Since this was not the main goal of the present work, we delay such attempts to a later paper. The above-mentioned findings confirm the physical relevance of our recent two-dimensional analogous SFA calculations [12], where similar regularities were found. It appears that probability distributions in the polarization plane for the real three-dimensional hydrogen atom are very similar to those obtained in its simplified two-dimensional model.…”

Section: Discussionsupporting

confidence: 90%

“…The SFA is expected to be valid for z 1 1 (our curves in figures 1 and 2 begin at z 1 = 1). The multipeak effect (visible enough) in the LG SFA appears for z 1 50 [12] or z 1 100 (this work). In the recent experiment of the Keller group [18], the Keldysh parameter γ was equal to γ = 0.73, which corresponds to z 1 = 3.8.…”

Section: Discussionsupporting

confidence: 51%

“…We are in hope that the LG SFA is able to describe correctly (at least qualitatively) what happens with the atom in an intense circularly polarized laser pulse. In our humble opinion, the advantage of the LG form of the SFA is connected with a matter of gauge invariance [16] (for a shorter version of the justification see appendix B in [6] or appendix C in [12]).…”

Section: Discussionmentioning

confidence: 99%

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Comparison of two forms of theS-matrix element of strong-field photoionization: II. (n,l,m) = (2, 1, ±1) states

Bauer

2013

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

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In our previously published work (Bauer 2008 J. Phys. B: At. Mol. Opt. Phys. 41 185003) we numerically compared ionization rates and photoelectron energy (or momentum) spectra resulting from the so-called length gauge (LG) and velocity gauge (VG) forms of the Keldysh–Faisal–Reiss theory for a strong circularly polarized laser field. Our investigations concerned initial (bound) states of a hydrogen atom with the principal quantum number equal to 1 or 2. However, some of these states were not taken into account in this work, but only their linear combinations (quantum-mechanical superpositions). The main purpose of the present work is to fill this gap. It is appropriate to add that excited bound states (of the hydrogen atom) considered here are easier to achieve from an experimental point of view. As in our previous work, we find substantial differences in the shape of photoelectron energy spectra for both (LG and VG) theories. Differently from the VG theory, the LG one shows a multipeak envelope in photoelectron energy spectra for most initial states of the hydrogen atom. We give examples showing that the multipeak effect may be observed also in the polarization plane of the laser field. The field parameters (frequency and intensity) applied by us in the calculations indicate that one should be able to observe experimentally the above-mentioned effect in the near future.

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“…Theoretically, m-dependent strong-field ionization has been studied based on several different methods, such as the PPT model [13,14,22], strong-field approximation [23][24][25][26], adiabatic approximation [27], the time-dependent Schrödinger equation (TDSE) [28][29][30][31][32][33][34][35][36][37], the time-dependent R-matrix [38,39], the analytical R-matrix [40,41] and so on. For neutral atoms, it is well known that the tunneling ionization is preferential as the electron counter-rotates with the CPL field [13,14,32].…”

Section: Introductionmentioning

confidence: 99%

Role of excitation in the electron rotational asymmetry in circularly polarized laser fields

Wen

Jing

Sun

et al. 2023

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

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We comparatively study electron rotational asymmetries in photoionization of the excited hydrogen atom and photodetachment of the fluorine anion in single circularly polarized laser fields by numerically solving the three-dimensional time-dependent Schrödinger equation (3D-TDSE). We first show that single-photon ionization (or detachment) is more favored for the electron initially corotates with respect to the direction of the laser field. More interestingly, we systematically demonstrate the electron rotational asymmetry of the excited hydrogen atom is completely contrary to that of the fluorine anion in multiphoton ionization (or detachment) regime, which can be attributed to the role played by excited bound states by analyzing the total excitation probability in the excited hydrogen atom. Furthermore, we also confirmed that the electron rotational asymmetry of 2p+ and 2p− degenerate orbitals in the excited hydrogen atom changes when the ionization mechanism switches from three-photon to over-the-barrier.

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Multipeak envelope of the above-threshold-ionization energy spectrum in a strong circularly polarized laser field

Cited by 11 publications

References 28 publications

Effects of ultrashort laser pulses on angular distributions of photoionization spectra

Effects of ultrashort laser pulses on angular distributions of photoionization spectra

Comparison of two forms of theS-matrix element of strong-field photoionization: II. (n,l,m) = (2, 1, ±1) states

Role of excitation in the electron rotational asymmetry in circularly polarized laser fields

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