arXiv subjects

G. Scoles

Publications and source records attributed to G. Scoles.

2 recordsLinked to original sources

arXiv1999

A superfluid hydrodynamic model for the enhanced moments of inertia of molecules in liquid 4He

We present a superfluid hydrodynamic model for the increase in moment of inertia, $ΔI$, of molecules rotating in liquid $^4$He. The static inhomogeneous He density around each molecule (calculated using the Orsay-Paris liquid $^4$He density functional) is assumed to adiabatically follow the rotation of the molecule. We find that the $ΔI$ values created by the viscousless and irrotational flow are in good agreement with the observed increases for several molecules [ OCS, (HCN)$_2$, HCCCN, and HCCCH$_3$ ]. For HCN and HCCH, our model substantially overestimates $ΔI$. This is likely to result from a (partial) breakdown of the adiabatic following approximation.

cond-mat↗

arXiv1999

Single and Double Resonance Microwave Spectroscopy in Superfluid $^4$He Clusters

Purely rotational transitions of a molecule, such as HCCCN, embedded in large $^4$He 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.

physics.chem-ph↗