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- W2065876516 abstract "Time-resolved laser optogalvanic (LOG) signals have been induced by pulsed laser excitation (lsj→2pk, Paschen notation) of a ∼30 MHz radio-frequency (rf) discharge in neon at ∼5 torr. Dramatic changes of the shape/polarity of certain parts of the LOG signals occur when the rf excitation frequency is scanned over the electrical resonance peak of the plasma and the associated driving/detecting circuits. These effects are attributed to ionization rate changes (i.e., laser-induced alterations of the plasma conductivity), with concomitant variations in the plasma resonance characteristics. In addition to ionization rate changes, it is shown that photoacoustic (PA) effects also play a significant role in the generation of the LOG signal. Those parts of the LOG signal that are invariant with respect to the rf frequency are attributed to a PA effect. The similarity of LOG signal shapes from both rf and dc discharges suggests that photoacoustics play a similar role in the LOG effect in dc discharges. Contrary to common belief, most reported LOG signal profiles, ones produced by excitation to levels that do not lie close to the ionization threshold, appear to be totally mediated by the PA effect." @default.
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- W2065876516 date "1990-09-15" @default.
- W2065876516 modified "2023-10-16" @default.
- W2065876516 title "Role of photoacoustics in optogalvanics" @default.
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- W2065876516 doi "https://doi.org/10.1063/1.458776" @default.
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