The rotational infrared spectra of complexes of OCS with single para-H-2, H
D, and ortho-D-2 molecules inside cold (0.15 K) mixed He-4/He-3 droplets ar
e used to determine the in-plane structure, in agreement with calculations
for the free complex, as well as the out-of-plane amplitude imposed by the
superfluid liquid He-4 environment. (C) 2001 American Institute of Physics.