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  • ATOMIC AND MOLECULAR PHYSICS  (3)
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  • 1
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    Measuring the velocity of individual atoms in real time (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: It is proposed that the thermal velocity of a single atom could be measured in real time using a laser time-of-flight velocimeter (LTV) operating on the principle of laser resonance fluorescence. Theoretical data are presented for several atomic species that have resonances within the range of available dye-laser systems. It is shown that measurements in the subsonic region are certainly feasible. The atoms could be either in vacuum or in a buffer gas, e.g., at atmospheric pressure. Measurements in the transonic and supersonic region also appear possible. One potential application is the measurement of flow speeds in wind tunnels, perhaps as high as Mach 45.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Optics Letters; 2; Feb. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Detection of individual atoms in helium buffer gas and observation of their real-time motion (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Single atoms are detected and their motion measured for the first time to our knowledge by the fluorescence photon-burst method in the presence of large quantities of buffer gas. A single-clipped digital correlator records the photon burst in real time and displays the atom's transit time across the laser beam. A comparison is made of the special requirements for single-atom detection in vacuum and in a buffer gas. Finally, the probability distribution of the bursts from many atoms is measured. It further proves that the bursts observed on resonance are due to single atoms and not simply to noise fluctuations.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Optics Letters; 5; Nov. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Stimulated Rayleigh-Brillouin gain spectroscopy in pure gases (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Stimulated Rayleigh-Brillouin gain spectra of pure gases are reported. Stimulated Rayleigh scattering is now clearly distinguishable from stimulated Brillouin scattering without the aid of induced absorption. As examples, spectral line shapes of Ar and SF6 at various pressures and the associated gain asymmetry are discussed. Potential applications of coherent Rayleigh-Brillouin spectroscopy are suggested.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 51; 1648-165
    Format: text
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    NASA TECHNICAL REPORTS
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