Nanosecond pulsed laser induced fluorescence : measuring the depopulation rates of argon excited states

J.M. Palomares Linares, E.A.D. Carbone, S. Hubner, J.J.A.M. Mullen, van der

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Abstract

In this contribution we report the application of time resolved laser induced fluorescence (tr-LIF) experiments on low pressure argon surfatron plasmas to obtain insight in the argon excitation kinetics. In this experimental study we pump two excited levels of the argon system in the 4p and 5p group. Studying the decay time of the fluorescence signal for different plasma conditions in combination with precise Thomson scattering measurements of the electron density, enable us to obtain the rates for the collisional processes that depopulate the levels, namely the heavy particle quenching and the inelastic electron-atom collisions rate. We have measure depopulation rates one order of magnitude larger for the higher excited levels. We have also observed increase of the electron collision rates for lower gas pressures as well as indications of self-absorption of the studied 4p line under low pressure conditions (<1 mbar).
Original languageEnglish
Title of host publicationProceedings of the 30th International Conference on Phenomena in Ionized Gases (ICPIG 2011), August 28th- September 2nd, 2011, Belfast, UK
PagesA1-275-1/4
Publication statusPublished - 2011
Event30th International Conference on Phenomena in Ionized Gases (ICPIG 2011), August 28 - September 2, 2011, Belfast, UK - Belfast, United Kingdom
Duration: 28 Aug 20112 Sep 2011
http://www.qub.ac.uk/sites/icpig2011/

Conference

Conference30th International Conference on Phenomena in Ionized Gases (ICPIG 2011), August 28 - September 2, 2011, Belfast, UK
Abbreviated titleICPIG 2011
CountryUnited Kingdom
CityBelfast
Period28/08/112/09/11
Internet address

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