Abstract
A neon bulb used in a relaxation oscillator is a sensitive detector for observing optogalvanic spectra of neon. A few percent change in the oscillation frequency was observed with resonant irradiation of tenths of microwatts for some neon lines. The percent change is greater than the corresponding current change in an ordinary optogalvanic detection by 2 orders of magnitude. The new technique, not requiring a lock-in amplifier and a special sample cell, probably provides the simplest and the cheapest method for calibrating wavelengths.
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