Electron, Ion and Atom Collisions Leading to Anomalous Doppler Broadening in Hydrogen

Details Electron, Ion and Atom Collisions Leading to Anomalous Doppler Broadening in Hydrogen Electron, Ion and Atom Collisions Leading to Anomalous Doppler Broadening in Hydrogen

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..938..237p&link_type=abstract

SPECTRAL LINE SHAPES IN ASTROPHYSICS: VI Serbian Conference on Spectral Line Shapes in Astrophysics (VI SCSLSA). AIP Conference

Astronomy and Astrophysics

Astrophysics

Atomic And Molecular Data, Spectra, And Spectral Parameters, Atomic, Molecular, Ion, And Heavy-Particle Collisions, Electron Collisions, Monte Carlo Methods, Low-Field And Townsend Discharges

Scientific paper

DC high E/N swarm experiment (self sustained discharge operating in the Townsend regime) may be modeled directly and exactly as it does not require self consistent calculation of the electric field and is thus open to a simple Monte Carlo simulation that may include complexity at the level of representation of collisional events. Thus such an experiment operating under swarm conditions is the best way to test the mechanism of generation of anomalously large Doppler broadening that was often observed in low pressure discharges.
In this paper we show revised results of modeling of Doppler profiles by using a well tested Monte Carlo procedure and revised models of heavy particle collisions. In particular we study the importance of fast H2 and fast H particles, the effect of different models of angular distribution of particles scattered of the surface and of the molecules and we study the role of the energy losses due to vibrational excitation.

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