Abstract
A microcomputer-controlled photon counting system using a digital sampling method has been developed to perform the spectral measurement of weak lines emitted from Ne atoms and ions excited by square-wave voltage pulses in hollow-cathode discharge tubes with sufficient sensitivity and accuracy. The characteristic features of the system are, 1) the high-voltage pulse generator and photon counter are operated synchronously, 2) the background noise and dark current of the photomultiplier are effectively eliminated by the use of two sampling gates, 3) even when the scanning range is greatly expanded, fluctuation of the gate position remains small. It has been observed using the system that the rise time of the intensity of a neutral line of Ne is generally shorter than that of an ionic line in pulsed hollow-cathode discharge.
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