Spatial and temporal behaviour of electron temperatures in laser sparks in nitrogen, argon and helium
- 11 July 1975
- journal article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 8 (10) , 1177-1184
- https://doi.org/10.1088/0022-3727/8/10/004
Abstract
Spatially resolved recordings of the plasma emission in a narrow spectral band and the absorption of an He-Ne laser probe beam have been used to deduce the electron temperature and estimate the density in sparks produced by a Q-switched Nd laser in nitrogen, argon and helium at pressures from 0.5 to 4.5 atm. A uniform temperature decay with time constants of several hundred nanoseconds is observed in nitrogen and argon in the range of 5-1 eV, whereas in helium a secondary heat wave emerges from the initial breakdown zone approximately=150 ns after breakdown. The temperatures obtained are in good agreement with published spectroscopic measurements under similar conditions.Keywords
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