Endoergic and resonant charge transfer excitation in He-Cu discharge |
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Authors: | P Mezei K Rózsa M Jánossy P Apai |
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Institution: | (1) Central Research Institute for Physics, P.O.B. 49, H-1525 Budapest 114, Hungary |
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Abstract: | The intensity of Cu-II lines with upper level energies near and above those of the He ion was measured as a function of He pressure in a Cu hollow cathode tube. In this tube at low pressures the negative glow could expand above the cathode. The maximum intensity of the Cu-II 493.1 nm line was found in the low voltage, high pressure hollow cathode discharge region in accordance with a resonant charge transfer excitation process. Enhancement of the intensity of the Cu-II 436.5 nm and 417.9 nm lines was observed in the cathode glow at low pressures. Excitation of these lines is attributed to endoergic charge transfer collisions between He ions accelerated by the 2 kV tube voltage and ground state Cu atoms. The cross-section for this reaction exciting the 436.5 nm line was estimated to be of the order of 10–17 cm2. |
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Keywords: | 34 42 55C 52 |
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