Single and Double Resonance Microwave Spectroscopy in Superfluid 4He Clusters
I. Reinhard, C. Callegari, A. Conjusteau, K. K. Lehmann, G. Scoles
Abstract
Purely rotational transitions of a molecule, such as HCCCN, embedded in large 4He clusters have been detected for the first time. The saturation behavior shows that, in contrast to previous expectations, the microwave line profiles are dominated by inhomogeneous broadening mechanisms. Spectral holes and peaks produced by microwave-microwave double resonance have widths comparable to those of single resonance lines, indicating that relaxation occurs among quantum states of the inhomogeneous distribution of each rotational level, at a rate approximately 10 times faster than rotationally inelastic relaxation.
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