Population Difference and Pulse-Mode Optogalvanic Effect on Hel(2³S-3³P) 388.9-nm

抄録

Pulse-dye-laser-induced optogalvanic (OG) effect has been investigated on Hel(2³S-3³P) 388.9-nm in the positive column of a He glow discharge. It has been found that the peak OG current is approximately in proportion to the steady-state population difference between the 2³S and 3³P states. A rate equation analysis is made on the ion density and the population of the excited levels relevant to the optical pumping on the basis of the mechanism in which the excess charges responsible for the OG signal are generated and decay via associative ionization collision of the 3³P state atoms optically pumped from the 2³S state and via recombination governed by the ion wall current as described by Tonks and Langmuir, respectively.