Dynamics of Liquid N2 at T=66.4 K Studied by Neutron Inelastic Scattering

Kim Carneiro, J. P. McTague

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Neutron inelastic scattering from liquid N2 at T=66.4 K and saturated vapor pressure is presented in the form of the normalized coherent nuclear-scattering law Sn,coh(κ, ω). Our results at the wave vector, κ=0.1 Å-1 are consistent with recent computer simulation showing that the sound mode continues to propagate for larger wave vectors than described by linear hydrodynamic theory. At larger wave vectors no evidence is found of propagating phononlike excitations in this liquid, but the observed spectra are broad and centered around the mean recoil energy of a Boltzmann gas. Using Sears' partial-wave expansion to separate the scattering owing to rotational motion from that owing to the motion of the molecular centers, we compare the latter to the result obtained from liquid argon, appropriately scaled according to the principle of corresponding states. The over-all agreement is good, but significant deviations from scaling are observed and briefly discussed in terms of anisotropic interactions. Further, the information obtained on rotational relaxation is compared with recent experiments and theories.
    Original languageEnglish
    JournalPhysical Review A
    Volume11
    Issue number5
    Pages (from-to)1744-1754
    ISSN2469-9926
    DOIs
    Publication statusPublished - 1975

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