Abstract
A recently proposed method of optogalvanic double-resonance (OGDR) spectroscopy, which employs two cw lasers modulated at different frequencies and a dc discharge, has been investigated theoretically as well as experimentally. The technique is demonstrated to provide a versatile, state-selective spectroscopic method. A detailed analysis has been carried out for different situations where two lasers pump transitions which have the lower and/or upper state, or no state, in common. It also shows that the OGDR signal detected at the sum or difference modulation frequency can be given as a linear combination of the perturbed population densities in a plasma which give rise to the single-resonance signal. In addition, the results show that the OGDR signal polarity is characteristic for each type of double resonance. This has been verified in an OGDR experiment using a hollow-cathode discharge in neon and two cw dye lasers. State-selective OGDR spectra have been compared with optical-optical double-resonance spectra. Useful applications and advantages of the OGDR spectroscopy are discussed.
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