Temperature Measurements of Rarefied Gases by the Metastable Time-of-Flight Technique
- 1 July 1980
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 19 (7)
- https://doi.org/10.1143/jjap.19.1205
Abstract
By using the metastable time-of-flight technique (MTOF), experiments were carried out to determine the temperatures of extremely rarefied Ar and N2 gases at temperatures ranging from 300 to 550 K and at pressures of 10-5 Torr or lower. Temperatures were calculated from the time spectra obtained for Ar gas within the accuracy of ±3 K on the assumption that the Ar atoms excited onto the metastable states have a Maxwellian velocity distribution. Temperatures of N2 gas were obtained also within the accuracy of ±3 K; in this case some metastable states of N2 molecules are considered to have a mean life time of 160 µs due to radiative decays.Keywords
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