Microwave-infrared double resonance spectroscopy of an OCS molecule inside a ~4He droplet

摘要

The dynamicla behavior of single OCS molecules embedded in large (N_4 = 6000) superfluid ~4He droplets has been investigated with high resolution double resonance infrared-microwave spectroscopy. TRhe individual lines for the rotational transitions 2<->1, 3<->2, 4<->3, and 45<->4 are clearly resol ed in the difference double resonance spectra and eveal a fine structure. This isespecially well resolved for the 3<->2 transition which exhibits five separate lines haing widths of about 50 MHz and sep[arated by 200 MHz.The possible origin of the splitting is discussed