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Sökning: L773:1050 2947 OR L773:1094 1622 > Luleå tekniska universitet

  • Resultat 1-4 av 4
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1.
  • Gustafsson, Magnus, et al. (författare)
  • Infrared absorption by H2-Ar collisional complexes and the anisotropy of the intermolecular interaction potential
  • 2006
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 74
  • Tidskriftsartikel (refereegranskat)abstract
    • H2-Ar scattering processes in the presence of a weak photon field are considered. Calculations are based on an accurate ab initio interaction-induced electric dipole surface and an anisotropic intermolecular potential energy surface. The close-coupled scheme of integrating the Schrödinger equation is employed to calculate the rototranslational absorption spectrum of H2-Ar pairs in the far-infrared region of the electromagnetic spectrum. The results are compared with previous work where the weak anisotropy of the intermolecular interaction potential was suppressed. Under the conditions considered, accounting for the anisotropy modifies the rototranslational absorption spectrum discernibly, but only at some frequency bands where the corrections are negative, typically below 10%.
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2.
  • Gustafsson, Magnus, et al. (författare)
  • Intracollisional interference of R lines of HD in mixtures of deuterium hydride and helium gas
  • 2001
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 63:5
  • Tidskriftsartikel (refereegranskat)abstract
    • Line shapes of the R0(0) and R0(1) lines in the pure rotational band, and of the R1(0) and R1(1) lines in the fundamental band of HD are computed from first principles for HD molecules that interact collisionally with He atoms. Interference of the permanent dipole of the HD molecule and the interaction-induced dipole of HD–He supermolecular complex shapes these profiles. We use the close-coupling scheme for the scattering calculations which take into account the anisotropy of the HD–He interaction potential. Thus rotational level mixing is accounted for in a non-perturbative manner. The treatment is fully quantum mechanical and takes into account single binary collisions between HD and He. Spectral absorption profiles and line shape parameters of the R-lines are computed for comparison with existing measurements at 77 K. Agreement between theory and measurements is observed in the low-helium-density limit of the measured absorption as expected.
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3.
  • Henderson, M., et al. (författare)
  • Lifetimes of the 5d ^{9} 6p levels in Hg III
  • 1999
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 59:5, s. 4068-4070
  • Tidskriftsartikel (refereegranskat)abstract
    • We report measurements and theoretical calculations for the lifetimes of the 5d96p levels in Hg iii with J=0,2,3,4. This is an extension of earlier measurements of the lifetimes of the 5d96p levels in Hg iii with J=1, and now provides data for all 12 of the levels. The results also provide an isoelectronic comparison with earlier studies of these levels in Au ii of the Pt sequence, and a homologous comparison with earlier studies of the 4d95p levels in Ag ii, Cd iii, and In iv in the Pd sequence.
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4.
  • Scandale, W., et al. (författare)
  • Experimental study of the radiation emitted by 180-GeV/c electrons and positrons volume-reflected in a bent crystal
  • 2009
  • Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 79:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The radiation emitted by 180-Ge/c volume-reflected electrons and positrons impinging on a bent crystal has been measured by the H8RD22 Collaboration on the H8 beamline at the CERN SPS. A dedicated spectrometer has been developed to measure high-energy photon spectra (up to ∼100 GeV) under volume reflection: photon and charged particle beams have been separated by a bending magnet and leptons were detected and tagged by microstrip silicon detectors and a Pb-scintillator sampling calorimeter. A comparison between the experimental and analytical data for the amorphous and volume-reflection cases is presented and the differences are discussed. © 2009 The American Physical Society.
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  • Resultat 1-4 av 4

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