Laser Assisted Electron - Alkali Atom Collisions

Genetic programming approach for electron- alkali-metal atom collisions

New technique is presented for modeling the total cross sections of electron scattering by Na, K, Rb and Cs atoms in the low and intermediate energy regions. The calculations have been performed in the framework of genetic programming ( GP ) technique. The GP has been running based on the experimental data of the total collisional cross sections to produce the total cross sections for each targ...

Ultrahigh harmonics from laser-assisted ion-atom collisions.

We present a theoretical analysis of high-order harmonic generation from ion-atom collisions in the presence of linearly polarized intense laser pulses. Photons with frequencies significantly higher than in standard atomic high-harmonic generation are emitted. These harmonics are due to two different mechanisms: (i) collisional electron capture and subsequent laser-driven transfer of an electro...

Theoretical Investigation of Cold Alkali Atom Collisions

Plateau structure in resonant laser-assisted electron-atom scattering.

Orders of magnitude increases are predicted in the cross sections for electron-atom scattering accompanied by absorption or emission of n laser photons for incident electron energies at which the electron, by emitting micro laser photons, can be captured by the atom to form a negative ion. Enhancements are most significant in the plateau region (n>>micro) of the scattered electron spectrum, who...

Electron collisions with cesium atoms---benchmark calculations and application to modeling an excimer-pumped alkali laser

The B-spline R-matrix (BSR) with pseudostates method is employed to describe electron collisions with cesium atoms. Over 300 states are kept in the close-coupling expansion, including a large number of pseudostates to model the effect of the Rydberg spectrum and, most importantly, the ionization continuum on the results for transitions between the discrete physical states of interest. Predictio...