Electron rotational asymmetry in strong-field photodetachment from F− by circularly polarized laser pulses

Abstract

We use the R-matrix with time-dependence method to study detachment from F − in circularlypolarized laser fields of infrared wavelength. By decomposing the photoelectron momentum distribution into separate contributions from detached 2p1 and 2p−1 electrons, we demonstrate that the detachment yield is distributed asymmetrically with respect to these initial orbitals. We observe the well-known preference for strong-field detachment of electrons that are initially counter-rotating relative to the field, and calculate the variation in this preference as a function of photoelectron energy. The wavelengths used in this work provide natural grounds for comparison between our calculations and the predictions of analytical approaches tailored for the strong-field regime. In particular, we compare the ratio of counter-rotating electrons to corotating electrons as a function of photoelectron energy. We carry out this comparison at two wavelengths, and observe good qualitative agreement between the analytical predictions and our numerical results. arXiv:1911.00290v1 [physics.atom-ph] 1 Nov 2019

Ionization and excitation of low-lying circular states of the hydrogen atom in strong circularly polarized laser fields

“…Theoretically such effects were predicted much earlier [3,19,20] and quite recently, for instance, in Refs. [9,12,13,24,27,28,38,39,41,[48][49][50][51][52][53][54]. Most of the above works is devoted to the circular dichroism in adiabatic or nonadiabatic tunneling regimes.…”

“…for corotating light. (The mixing of two paths ( 6) and ( 7) is also allowed [39].) Of course, when the laser field is on, the photons may be absorbed or emitted time and again and both quantum numbers ( ) m l, may decrease as well.…”

Electron correlation and short-range dynamics in attosecond angular streaking

“…We note the expected dominance of counter-rotating electrons under these conditions, as well as the clear energy separation between the slow counter-rotating electrons and the faster corotating electrons. Both these tendencies have been seen in numerous calculations [29,34,35]. However, the relative angular offset within an attoclock scheme is less-thoroughly explored.…”

“…Our treatment of the F − ionic structure is described in previous work [26,28,29], and is based on earlier Rmatrix Floquet calculations for this system [30,31]. To investigate electron correlation in the core, we consider two atomic structure models, one in which the residual F atom is treated at the Hartree-Fock level of detail [32], and another that uses pseudo-orbitals to construct a set of configurations for subsequent use in a configurationinteraction calculation of the 1s 2 2s 2 2p 5 2 P o state of F. We couple a single electron to the residual neutral, retaining all 1s 2 2s 2 2p 5 l channels up to l = L max + 1.…”

Modeling tomographic measurements of photoelectron vortices in counter-rotating circularly polarized laser pulses

“…Recently, RMT calculations of photoelectron momentum distributions for two-photon ionization of helium using counter-rotating circularly polarized pulses [52] were compared against those from time-dependent close-coupling calculations [30]. A further study addressed the influence of the bound-electron magnetic quantum number on detachment yields from F − in circularly polarized pulses [58].…”