title: Rotational Spectrum of Dichloromethane-Ne: Internal Dynamics and Cl Quadrupolar Hyperfine Effects.
abstract: The rotational spectra of three isotopologues, CH2(35)Cl2···(20)Ne, CH2(35)Cl(37)Cl···(20)Ne, and CH2(35)Cl2···(22)Ne, of the complex dichloromethane-neon have been assigned and measured by molecular beam Fourier transform microwave spectroscopy. The corresponding tunnelling splittings-due to the motion of Ne from above to below the ClCCl plane-have been determined as ΔE0+0- = 6.8900(5), 6.6630(4), and 6.3724(7) MHz, respectively. From these data the barrier to planarity has been obtained, B2 = 68.7 cm(-1). In addition, the structure and the (35)Cl (or (37)Cl) quadrupole coupling constants have been determined.
authors.affiliation: Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), Sezione di Bologna CNR , Via Gobetti 101, I-40129 Bologna, Italy.
authors.forename: Laura B
authors.initials: LB
authors.lastname: Favero
authors.affiliation: Dipartimento di Chimica "G. Ciamician" dell'Università , Via Selmi 2, I-40126 Bologna, Italy.
authors.forename: Assimo
authors.initials: A
authors.lastname: Maris
authors.affiliation: Dipartimento di Chimica "G. Ciamician" dell'Università , Via Selmi 2, I-40126 Bologna, Italy.
authors.forename: Laura
authors.initials: L
authors.lastname: Paltrinieri
authors.affiliation: Dipartimento di Chimica "G. Ciamician" dell'Università , Via Selmi 2, I-40126 Bologna, Italy.
authors.forename: Walther
authors.initials: W
authors.lastname: Caminati