Abstract
Dynamic optogalvanic signals of Ar/rare-earth metal hollow-cathode discharges are measured in detail by chopped CW diode laser irradiation at 772.376 nm (1s 5–2p 7 transition for Ar metastable level in Paschen's notation). In the negative resistance region of the voltage–current curve, a component which has a time scale of a few hundreds microseconds in a dynamic optogalvanic signal is observed. The plot of the magnitudes of the optogalvanic signals versus the discharge currents shows a peak in the same discharge current region. Resonant ionizing energy transfer collisions between the argon atoms in the lowest metastable state and the sputtered atoms in the ground state are discussed to explain the experimental observations for several different rare-earth metal cathodes. Direct optogalvanic measurement of the sputtered atoms in the negative resistance region is also performed to investigate the Penning ionization effect on the optogalvanic response.
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