title: Evidence for negative cross correlations in vibrational dephasing in liquids: isotropic raman-line shift and width phenomena in isotopic mixtures of N2 and O2
abstract: To experimentally confirm the hypothesis of negative cross terms between different dephasing mechanisms, potentially leading to a broadening of the isotropic Raman line upon isotopic dilution, we present a detailed study on the concentration dependencies of all of the line shifts and widths in the four isotopic mixtures of type (15N14N)(x)-(14N2)(1-x), (15N2)(x)-(14N2)(1-x), (15N2)(x)-(15N14N)(1-x), and (16O2)(x)-(18O2)(1-x) near the normal boiling point of nitrogen at T = 77.35 K. A quite disparate behavior of the nitrogen oscillators compared to the oxygen oscillators was observed in respect to a change of their isotopic baths.
authors.affiliation: Institut fur Physikalische Chemie, Friedrich-Schiller-Universitat Jena, D-07743 Jena, Germany.
authors.initials: D
authors.lastname: Keutel
authors.initials: F
authors.lastname: Seifert
authors.initials: KL
authors.lastname: Oehme
authors.initials: A
authors.lastname: Asenbaum
authors.initials: M
authors.lastname: Musso