The dynamical behavior of single OCS molecules embedded in large (N4=6000) superfluid 4He droplets has been investigated with high resolution double resonance infrared-microwave spectroscopy. The individual lines for the rotational transitions 2↔1, 3↔2, 4↔3, and 5↔4 are clearly resolved in the difference double resonance spectra and reveal a fine structure. This is especially well resolved for the 3↔2 transition which exhibits five separate lines having widths of about 50 MHz and separated by 200 MHz. The possible origin of the splitting is discussed.
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Grebenev et al. (2000) studied this question.
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