Observation of infrared-microwave double resonance for the far-infrared laser pumping transition of CH3OH coincident with the 10.4 R (38) CO2 laser line

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Abstract
An infrared‐microwave double‐resonance experiment has been performed on the CH3OH infrared transition pumped by the 10.4 R (38) CO2 laser line. The effect of the laser pumping was investigated on the intensities of the JK=264←255A± ground‐state microwave absorption lines, which were monitored in a standard microwave Stark cell. The intensity of the A+ microwave probe transition increased by about 5% with laser pumping, while that of the A− transition did not change. This supports the reported assignment of the infrared CH3OH far‐infrared laser pumping transition as the QP4(26) A+ transition.