Helium clusters seeded with CO molecules: New results for HeN-13C18O and the approach to the nanodroplet limit

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TypeArticle
Journal titleThe Journal Of Chemical Physics
Volume125
Issue16
Pages1643288; # of pages: 164321
Subjectatomic clusters; carbon compounds; drops; helium neutral molecules; infrared spectra; isotope shifts; rotational states; vibrational states
AbstractInfrared spectra of helium clusters seeded with doubly substituted carbon monoxide molecules, 13C18O, have been studied in order to complement recent helium nanocluster results and to determine whether additional isotopic data would help to separate vibrational and rotational contributions to the observed transitions. The experiments were made by direct infrared absorption in pulsed supersonic jet expansions using a tunable diode laser probe in the region of the fundamental band (~2045 cm?1 for 13C18O). Even with data on the R(0) transitions from four CO isotopomers, it was found that a clear and consistent separation of vibration and rotation could not be achieved for HeN–CO clusters in the size range N[approximate]10–20. Isotope shifts observed for clusters with 13C18O (relative to 12C16O) were found to be close to the sums of the shifts previously determined for 13C16O and 12C18O. The new measurements generally supported previous assignments of cluster size, but some modifications for the range N=14–16 are suggested here. New measurements for HeN–12C16O under conditions favoring larger clusters (high backing pressure and low jet temperature) showed that individual transitions could be resolved even at N[approximate]50. For larger clusters, a partly resolved "lump" of transitions was observed to approach the nanodroplet limit.
Publication date
Linkhttp://link.aip.org/link/?JCP/125/164328/1
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12328425
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Record identifiera669fa76-0e4d-4fc6-8ce6-2d69815168f8
Record created2009-09-10
Record modified2016-05-09
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