PubMed Health⌕ Search

Biomedical subjects

EY Sidky

Publications and source records attributed to EY Sidky.

5 recordsLinked to original sources
PubMed2000

Boundary-free propagation with the time-dependent Schrodinger equation

We present two methods that allow for the efficient numerical propagation of continuum wave packets to large times. Time-dependent solutions of the Schrodinger equation that include continuum components are numerically challenging to solve because the wave packet travels, spreads, and acquires a spatial phase gradient. The methods we propose account for these kinematic effects analytically in general and numerically tractable schemes.

Journal Article↗
PubMed2000

Electrons ejected with half the projectile velocity and the saddle point mechanism in ion-atom collisions

Full three-dimensional ejected electron momentum distributions for proton impact ionization of atomic hydrogen are calculated for impact energies 10 through 50 keV. The distributions show a peak in the longitudinal momentum at half the projectile impact velocity: the v/2 peak. A quantitative assessment of saddle point ionization, based on quantum and classical analysis, reveals that the v/2 peak is a false indicator for this mechanism. The influence of the potential saddle on ionization is seen to decrease rapidly from 10 to 50 keV.

Journal Article↗