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  • 1985-1989  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Low temperature measurements of the rotational relaxation in D2 free jets (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 5673-5676 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational relaxation of molecular deuterium in a free jet expansion has been studied between 78 and 473 K by pseudorandom time-of-flight technique. In the temperature range 78–308 K a decrease of the rotational collision number Zrot with increasing temperature is observed as predicted theoretically by Raff and by Rabitz and Lam. Also reported are room temperature data of Zrot for H2 and HD expansions. The number of collisions required to relax H2, D2, and HD at room temperature is in the ratio 10:5:1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448554
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High-resolution He-scattering apparatus for gas–surface interaction studies (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2771-2779 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high-resolution apparatus designed for the study of elastic and inelastic scattering of thermal helium atoms from crystal surfaces is presented. The highly expanded He nozzle beam has an energy spread ΔE/E of about 1.4% and is collimated to 0.2°. The angle subtended by the detector opening as seen from the sample is also 0.2°. Beam intensities as low as 10−6 of the specular beam intensity from a low-temperature clean Pt(111) surface are detectable. Pseudorandom chopping with a resolution of 2.5 μs (flight path 790 mm) is used for time-of-flight (TOF) analysis of the scattered helium. The base pressure in the sample chamber is in the low 10−11 mbar. The capabilities of the apparatus are demonstrated for physisorbed Xe adlayers on Pt(111). The results presented are obtained by using He scattering in various modes: coherent inelastic, coherent elastic, and incoherent (diffuse) elastic. This technique allows for a nondestructive nearly exhaustive characterization of the thermodynamics, structure, and dynamics of physisorbed adlayers on arbitrary substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139041
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Low-energy helium nozzle beam (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 369-372 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high-intensity supersonic nozzle beam source is described, whose beam energy can be varied between 2 and 170 meV (helium). Experimental performance and time-of-flight measurements on cold helium beams are reported. Condensation in the free jet expansions of helium has been studied by mass spectrometric detection of He+2. A correlation between the maximum speed ratio and the onset of clustering is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138305
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Absolute determination of molecular-beam intensities (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 52-57 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new type of detector for the determination of absolute molecular-beam intensities is described. The intensity is obtained from the work done on a cylindrical rotating body by the torque exerted by the impinging beam particles. The detector takes advantage of the very low and constant bearing friction of magnetically suspended rotors and of the complete particle momentum accommodation on uncleaned surfaces. The detection limit of the present design is Imin0 =1.2×1015/Mv˜, where M is the atom mass and v˜ the average velocity of the beam particles in ms−1. The molecular-beam detector turns out to be an absolute instrument. Principle, experimental performance, and measurements with helium nozzle beams are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138470
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    Paper (German National Licenses)
    Fulltext
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