title: Rotational study of carbon monoxide solvated with helium atoms.
abstract: High resolution microwave and millimeter-wave spectra of HeN-CO clusters with N up to 10, produced in a molecular expansion, were observed. Two series of J = 1-0 transitions were detected, which correspond to the a-type and b-type J = 1-0 transitions of He1-CO. The B rotational constant initially decreases with N and reaches a minimum at N = 3. Its subsequent rise indicates the transition from a molecular complex to a quantum solvated system already for N = 4. For N > or =6, the B value becomes larger than that of He1-CO, indicating an almost free rotation of CO within the helium environment.
authors.affiliation: I. Physikalisches Institut, University of Cologne, 50937 Cologne, Germany.
authors.forename: L A
authors.initials: LA
authors.lastname: Surin
authors.forename: A V
authors.initials: AV
authors.lastname: Potapov
authors.forename: B S
authors.initials: BS
authors.lastname: Dumesh
authors.forename: S
authors.initials: S
authors.lastname: Schlemmer
authors.forename: Y
authors.initials: Y
authors.lastname: Xu
authors.forename: P L
authors.initials: PL
authors.lastname: Raston
authors.forename: W
authors.initials: W
authors.lastname: Jäger