Browsing by Author "Lees, RM"

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Internal rotation and spin conversion of CH3OH in solid para-hydrogen
(2006-01-20)
Lee, YP
;
Wu, YO
;
Lees, RM
;
Xu, LH
;
Hougen, JT
The quantum solid para-hydrogen (p-H-2) has recently proven useful in matrix isolation spectroscopy. Spectral lines of compounds embedded in this host are unusually narrow, and several species have been reported to rotate in p-H-2. We found that a p-H-2 matrix inhibits rotation of isolated methanol (CH3OH) but still allows internal rotation about the C-O bond, with splittings of the E/A torsional doublet in internal rotation-coupled vibrational modes that are qualitatively consistent with those for CH3OH in the gaseous phase. This simplified high-resolution spectrum further revealed the slow conversion of nuclear spin symmetry from species E to species A in the host matrix, offering potential insight into nuclear spin conversion in astrophysical sources.