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- W1995792156 abstract "The absorption of microwaves in pulse irradiated C2H6 (ethane), N2, He, and Ar at atmospheric pressure has been investigated on a nanosecond timescale. In the case of C2H6, a time of less than 1 nsec following the pulse is required for the absorption signal to reach a time independent plateau value. For N2, He, and Ar, a considerable delay in the development of the absorption signal is observed. This increase in absorption coefficient over 20, 50, and 300 nsec in the case of N2, He, and Ar, respectively, is attributed to a time dependence of the electron collision frequency resulting from post-pulse thermalization of the electron energy. Using momentum transfer collision frequency data from swarm studies, the time dependence of the electron energy has been derived and is discussed in terms of the energy exchange rate coefficient Ku, defined by −d?/dt=Ku [?−(3/2) kT]N. For N2, Ku is found to be almost independent of electron energy over the range kTe=0.03–0.7 eV and has a mean value of 1.55×10−11 cm3 sec−1. For He, Ku increases from 0.25×10−11 cm3 sec−1 at kTe?0.03 eV to 1.3×10−11 cm3 sec−1 at kTe?1.5 eV. The results are compared with energy exchange parameters from other sources. A further growth of absorption signal over several hundred nanoseconds in He is attributed to Penning ionization of impurities." @default.
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- W1995792156 date "1975-09-01" @default.
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- W1995792156 title "The delayed absorption of microwaves due to electron thermalization in nanosecond pulse irradiated N2, He, and Ar at atmospheric pressure" @default.
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- W1995792156 doi "https://doi.org/10.1063/1.431548" @default.
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