Abstract
Since the double resonance effect in molecules was first observed in 1955 with an ammonia-beam maser at 24 GHz, it has been investigated as a tool for microwave and radiofrequency spectroscopy. The recent development of infrared lasers has made the infrared- microwave double resonance experiment feasible by using the vibration-rotation transitions in molecules. Previous works on double resonance were reviewed1 in 1971, and they are not shown in this paper.
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