Table of Contents
International Journal of Spectroscopy
Volume 2010, Article ID 936385, 4 pages
http://dx.doi.org/10.1155/2010/936385
Research Article

Laser-Induced Optical Breakdown in Methane: Diagnostic Using H-Gamma Line Broadening

1Center for Laser Applications, The University of Tennessee Space Institute, 411 B.H. Goethert Parkway, Tullahoma, TN 37388, USA
2206 Allison Laboratory, Department of Physics, Auburn University, Auburn, AL 36849, USA

Received 6 April 2009; Accepted 8 June 2009

Academic Editor: Elisabeth Dalimier

Copyright © 2010 Christian G. Parigger and Eugene Oks. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Measurements and analysis are reported of Stark-broadened profiles of the H-gamma line emitted from plasma formed by Laser-Induced Optical Breakdown (LIOB) in a pulsed methane flow. Electron densities are deduced for 18 instants of time in the range between 0.4 and 2.1 microseconds after LIOB and for 2 different gas pressures. The obtained values of are in a good agreement with the corresponding values found previously from Stark-broadened profiles of the H-alpha and H-beta lines.