Abstract Title: *
Chemi-ionization/recombination Atomic Processes in the AGNs Broad-Line Region

Authors: *
Vladimir A. Srećković, Milan S. Dimitrijević and Ljubinko M. Ignjatović

Institution: *
Institute of Physics, University of Belgrade, P.O. Box 57, 11001 Belgrade, Serbia

Preferred format: *
Oral

Abstract Text: *
The chemi-ionization and chemi-recombination processes in atom - Rydberg atom collisions,
are considered as factors of influence on the atom excited-state populations and ionization level
in clouds in Broad Line Region (BLR) region of active galactic nuclei (AGN). The presented
results are related to the moderately ionized layers of dense parts of the BLR clouds. It has
been found that the investigated chemi ionization/recombination processes for the conditions in
moderately ionized layers dominate over the relevant concurrent processes. This is an
indication that the considered chemi-ionization/recombination processes should have a very
significant influence on the optical properties of some regions in AGN.