Microwave–millimeter-wave double resonance experiments on Ar–CO

Jäger, Wolfgang; Gerry, M. C. L.
March 1995
Journal of Chemical Physics;3/1/1995, Vol. 102 Issue 9, p3587
Academic Journal
A new double resonance technique has been developed to extend the accessible frequency range of a cavity pulsed microwave Fourier transform spectrometer beyond the microwave to the millimeter wave range. The technique has been used to measure indirectly pure rotational transitions of the van der Waals complex Ar–CO in the millimeter-wave range. These have led to an improved value for its A-rotational constant. The experiments have been done with the signal transition in the microwave range and the pump transition in the millimeter-wave range, in order to exploit the high sensitivity of the microwave spectrometer. All double resonance effects observed can be rationalized in terms of pump (millimeter-wave) radiation-induced population transfer. © 1995 American Institute of Physics.


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