Abstract
The recombination of H 3 + ions with electrons has been studied in pulsed afterglow plasma. Measurements were carried out in helium buffer gas with small admixtures of argon and hydrogen. Molecular hydrogen number density was varied from 1011 up to 3×1013 cm−3. The gas temperature was varied from 130 K up to 250 K, and the total pressure ranged from 150 Pa to 320 Pa. Evolution of electron number density during afterglow was monitored by Langmuir probe. Measurements were carried out using new Variable Temperature Stationary Afterglow apparatus (VT-AISA). From the electron number density decays the recombination rate coefficient (α) was determined. Temperature dependence of recombination rate coefficient over broad range of hydrogen number densities was obtained from measured data. We observed strong dependence of α on partial pressure of hydrogen and on temperature. The measurement is continuation of our previous studies, which were carried out at 260 K only.
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