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arXiv:1302.0645 · Physical Review A

Effects of laser polarization on photoelectron angular distribution through laser-induced continuum structure

Gabriela Buică, Takashi Nakajima

Published Nov 30, 2005• 1 citation
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Abstract

We theoretically investigate the effects of laser polarization on the photoelectron angular distribution through laser-induced continuum structure. We focus on a polarization geometry where the probe and dressing lasers are both linearly polarized and change the relative polarization angle between them. We find that the total ionization yield and the branching ratio into different ionization channels change as a function of the relative polarization angle, and accordingly the photoelectron angular distribution is altered. We present specific results for the $4{p}_{1∕2}\text{\ensuremath{-}}6{p}_{1∕2}$ and $4{p}_{3∕2}\text{\ensuremath{-}}6{p}_{3∕2}$ systems of the K atom and show that the change of the polarization angle leads to a significant modification of the photoelectron angular distribution.

DOI
10.1103/physreva.72.053416

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We theoretically investigate the effects of laser polarization on the photoelectron angular distribution through laser-induced continuum structure. We focus on a polarization geometry where the probe and dressing lasers are both linearly polarized and change the relative polarization angle between them. We find that the total ionization yield and the branching ratio into different ionization channels change as a function of the relative polarization angle, and accordingly the photoelectron angular distribution is altered. We present specific results for the 4p1∕2\ensuremath-6p1∕24{p}_{1∕2}\text{\ensuremath{-}}6{p}_{1∕2}4p1∕2​\ensuremath-6p1∕2​ and 4p3∕2\ensuremath-6p3∕24{p}_{3∕2}\text{\ensuremath{-}}6{p}_{3∕2}4p3∕2​\ensuremath-6p3∕2​ systems of the K atom and show that the change of the polarization angle leads to a significant modification of the photoelectron angular distribution.
We theoretically investigate how the photoelectron angular distribution is altered by the introduction of a dressing laser. The physical mechanism underlying this alteration is the so-called laser-induced continuum structure; namely, a strong dressing laser induces quantum mechanical interference, the degree of which is different for different ionization channels. Therefore the branching ratio into different ionization channels changes as a function of laser detuning, and accordingly the photoelectron angular distribution is altered. After a general argument, we present specific theoretical results for the K atom, which indeed exhibit significant modification of the photoelectron angular distribution.
The influence of laser-induced continuum structure on the angular distribution of photoelectrons is studied in the femtosecond time domain by direct numerical solution of the time-dependent Schrodinger equation. Control of the photoelectron angular distribution is demonstrated for the hydrogen atom by coherent population transfer from the initial S-state to an excited D-state via the p-continuum and further ionization into the f-continuum states. A direct optimization procedure is used to find a domain of laser parameters, for which the efficiency of the control with respect to the time delay and energy detuning between the laser pulses is maximized.
In this paper, we present the theory of photoelectron angular distributions in resonant multiphoton ionization that rigorously takes into account the saturation, ac Stark-shift, and the laser-linewidth effects. The influence of these effects on the distribution is incorporated through the coupling equations between the angle-resolved ionization probabilities and the (time-dependent) bound-state density-matrix elements. General expressions for the angular distributions are derived and several properties of these distributions are arrived at from these expressions. Finally, numerical results are presented to illustrate the effects of saturation, of ac Stark shifts, and of the laser line shape.
Abstract Ionization of laser-dressed atomic helium is investigated with focus on photoelectron angular distributions stemming from two-color multi-photon excited states. The experiment combines extreme ultraviolet (XUV) with infrared (IR) radiation, while the relative polarization and the temporal delay between the pulses can be varied. By means of an XUV photon energy scan over several electronvolts, we get access to excited states in the dressed atom exhibiting various binding energies, angular momenta, and magnetic quantum numbers. Furthermore, varying the relative polarization is employed as a handle to switch on and off the population of certain states that are only accessible by two-photon excitation. In this way, photoemission can be suppressed for specific XUV photon energies. Additionally, we investigate the dependence of the photoelectron angular distributions on the IR laser intensity. At our higher IR intensities, we start leaving the simple multi-photon ionization regime. The interpretation of the experimental results is supported by numerically solving the time-dependent Schrödinger equation in a single-active-electron approximation. Graphic abstract
We investigate the role of spin-orbit interaction in the production of spin-polarized photoelectrons under the influence of a dressing laser. Although the scheme considered here is essentially based on the laser-induced continuum structure, it turns out that special care has to be taken for the spin states in the continua. This is because the spin-orbit interaction in the continuum cannot be neglected for our specific case. After the derivation of the general formula, specific theoretical results are presented for Rb and Cs atoms. Enhancement about a factor of 2 in the degree of spin polarization has been predicted for both systems by the introduction of a dressing laser.