Time Dependent BLR Photoionization Models

Time - dependent studies of single and multiple photoionization of H

A time-dependent method is used to study the photoionization of the simplest one-electron molecule, H2 1 . We use the variational principle to solve the time-dependent Schrödinger equation for H2 1 in spherical coordinates (r ,u) centered on the center of mass of the H2 1 system in a time-varying electromagnetic field, in the fixed-nuclei approximation. Bound and continuum states of H2 1 are ob...

Relativistic Photoionization Computations with the Time Dependent Dirac Equation

Time dependent photoionization opacities in dense Gamma–Ray Burst environments

The recent detection of a transient absorption feature in the X–ray prompt emission of GRB 990705 showed the importance of such observations in the understanding of gamma–ray bursts and their progenitors. We investigate the time dependence of photoionization edges during the prompt emission of bursts in different environments. We show that their variability can be used to infer the density and ...

Photoionization time delays

The material presented in this chapter is based on important advances realized in “attophysics” which make feasible to follow the motion of electrons in atoms and molecules with attosecond-level time resolution. In this context, timedelays have been recently determined in the process of photoionization by extremeultra-violet (xuv) pulses and the question of the significance of these measured de...

Time-Dependent Photoionization in a Dusty Medium. III: The effect of dust on the photoionization of metals

We use the time-dependent photoionization and dust destruction code developed by Perna & Lazzati (2002) to study the time evolution of the medium in a dusty gaseous cloud illuminated by a bright central source that sets on at time zero. We study the case of a bright source, which lasts for a time scale much smaller than the recombination and dust creation time scales. For this reason an equilib...