title: Low-energy vibrational spectra of flexible diphenyl molecules: biphenyl, diphenylmethane, bibenzyl and 2-, 3- and 4-phenyltoluene.
abstract: Gas phase absorption far-infrared (FIR) spectra of six flexible hydrocarbon molecules containing two phenyl groups -biphenyl, diphenylmethane, bibenzyl and 2-, 3-, 4-phenyltoluene- are reported for the first time, allowing an accurate determination of most of their active low-frequency vibrational modes. DFT calculations have been carried out at the harmonic and perturbative anharmonic levels to predict the vibrational spectra of these molecules and unambiguously assign observed vibrational modes.
authors.affiliation: Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Sud, bât. 210, 91405 Orsay Cedex, France. mmartin@cfa.harvard.edu.
authors.forename: M A
authors.initials: MA
authors.lastname: Martin-Drumel
authors.forename: O
authors.initials: O
authors.lastname: Pirali
authors.forename: C
authors.initials: C
authors.lastname: Falvo
authors.forename: P
authors.initials: P
authors.lastname: Parneix
authors.forename: A
authors.initials: A
authors.lastname: Gamboa
authors.forename: F
authors.initials: F
authors.lastname: Calvo
authors.forename: Ph
authors.initials: P
authors.lastname: Bréchignac