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Search results for: VIBRATIONAL EXCITATION

  • Vibrational excitation of acetylene by positron impact

    Publication

    - EUROPEAN PHYSICAL JOURNAL D - Year 2006

    Vibrationally inelastic quantum calculations are carried out at low collision energies for the scattering of a beam of positrons off acetylene gaseous molecules. The normal mode analysis is assumed to be valid and the relative fluxes into the C–C and C–H symmetric vibrational modes are computed within a Body-Fixed (BF) formulation of the dynamics by solving the relevant vibrational Coupled Channels (VCC) equations. The clear dominance...

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  • Vibrational excitation of tetrahydrofuran by electron impact in the low energy range

    Publication

    - CHEMICAL PHYSICS LETTERS - Year 2007

    Wzbudzenie oscylacyjne cząsteczki tetrahydrofuranu w zderzeniach z elektronami przeprowadzone było w zakresie energii 5-14 eV w szerokim kącie rozproszenia (20°-180°). Pomiary funkcji wzbudzenia oscylacyjnego modów rozciągających w grupie CH2 (wiązania C-H) wykazują obecność struktur dla energii 6.0, 7.9 i 10.3 eV, którym można przypisać formowanie się stanów rezonansowych jonów ujemnych cząsteczki. W pracy wyznaczono także różniczkowy...

  • Electron collisions with cyanoacetylene HC3N : Vibrational excitation and dissociative electron attachment

    Publication
    • M. Ranković
    • P. Nag
    • M. Zawadzki
    • L. Ballauf
    • J. Žabka
    • M. Polášek
    • J. Kočišek
    • J. Fedor

    - PHYSICAL REVIEW A - Year 2018

    We experimentally probe electron collisions with HC3N in the energy range from 0 to 10 eV with the focus on vibrational excitation and dissociative electron attachment. The vibrational excitation cross sections show a number of resonances which are mode specific: the two dominant π∗ resonances are visible in the excitation of all the vibrational modes; however, broad σ ∗ resonances are visible only in certain bond-stretching vibrational...

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  • Computed vibrational excitation ofCF4by low-energy electrons and positrons: Comparing calculations and experiments

    Publication
    • J. Franz
    • I. Baccarelli
    • S. Caprasecca
    • F. Gianturco

    - PHYSICAL REVIEW A - Year 2009

    Quantum calculations for the excitation of the asymmetric modes of the CF4 target gas, ν3 and ν4, by impact of low-energy electrons and positrons are carried out in the energy range around 1 eV and are compared with recent experimental findings. The similarities and differences between the two types of projectiles, and the two different modes, are analyzed and discussed vis à vis the present accord with the experimental results.

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  • Elastic electron scattering and vibrational excitation of isoxazole molecules in the energy range from 2 to 20 eV

    Publication

    Differential cross sections for elastic electron scattering and the excitation of the C-H vibrational modes of isoxazole molecules were measured in the energy range from 2 to 20 eV and over the scattering angle range from 10◦ to 180◦. The cross sections at the scattering angles of and above 90◦ were accessible with the use of a magnetic angle changer. The differential cross sections were integrated to yield integral and momentum...

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