Possible Mechanism of “Additional” Production of Hydrogen Negative Ions in a H2 Glow Dischargeстатья

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[1] Possible mechanism of “additional” production of hydrogen negative ions in a h2 glow discharge / S. G. Belostotsky, D. J. Economou, D. V. Lopaev, T. V. Rakhimova // 59-th Annual Gaseous Electronics Conference (GEC), 10-13 October 2006, Columbus, Ohio, USA. — Columbus, Ohio, USA, 2006. Based on measurements of H− and H densities a DC glow discharge in H2 (P=0.1-3 Torr) the rate coefficient of H− production as a function of E/N was determined. To analyze the mechanisms of H− production, a simple model of H2 vibrational excitation was developed. Estimations of vibrational level densities (v=3-5) obtained from VUV absorption measurements were in reasonable agreement with the calculated data. The analysis revealed that standard mechanisms of H−production (dissociative attachment to vibrationally excited molecules H2(v) and molecules in Rydberg states H2({Ry})) were not enough to explain the experimental results. In order to describe both the shape (vs E/N) and the magnitude of the measured H− production rate coefficient, an “additional” source of H−, having a strong resonant electron attachment CS in the range of ∼5-9 eV, should be invoked. Although H2 has no resonances in the 5-9 eV range, water is known to strongly dissociatively attach in this range. Thus, even small amounts (0.1-1{
explain the origin of the “additional” H− production. This result is corroborated by the work of Cadez {et. al.} in Proc. of XXVII ICPIG, 2005. This work was supported by the RFBR (No.05-02-17649a), Scientific School - 171113.2003.2 and NATO Collaborative Linkage Grant (No.980097).

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