High resolution infrared spectra of helium clusters seeded with isotopic carbon monoxide, HeN-13C 16O and HeN-12C 18O.
Infrared spectra of isotopically substituted HeN-CO clusters (1 < N < 19) have been studied in order to extend the original results on the normal isotope. The same two series of R(0) transitions were observed, correlating with the a- and b-type transitions of He1-CO, with only small shifts in relative position. The previously obscured a-type line for He6-CO was detected. Examination of the small shifts among isotopomers showed remarkably smooth behavior, except in the "unstable" regions around N=7 (b-type series) and 15 (a-type series). The overall results firmly support the assignments and analysis given for the normal isotope.
McKellar
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Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario K1A0R6, Canada.