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Flowing Mercury Afterglow Excited by D. C. Discharge

1971; Physical Society of Japan; Volume: 31; Issue: 3 Linguagem: Inglês

10.1143/jpsj.31.910

1347-4073

Masahiro Nishikawa, Yoich Fujii-e, Tokuo Suita,

Laser-induced spectroscopy and plasma

Atomic collision processes occurring in a flowing mercury afterglow excited by d. c. discharge are investigated by probe and optical measurements. The electron attachment process near the discharge source can be interpreted as the production process of temporary negative ions shown by U. Fano and J. W. Cooper. From decrease in density of the metastable atom somewhat distant from the discharge source, the diffusion coefficient and the conversion frequency from metastable atoms to metastable diatomic molecules are estimated to be 82/ p cm 2 s -1 and 830 p s -1 at about 400 K, respectively. From decrease in intensity of Hg lines at slow constant rate it is found that the conversion from atomic ions to molecular ions occurs at the rate of 150 p 2 s -1 and the dissociative recombination coefficient is 3.7×10 -7 cm 3 s -1 .