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  • ATOMIC AND MOLECULAR PHYSICS  (4)
  • 1990-1994  (3)
  • 1975-1979  (1)
  • 1965-1969
  • 1925-1929
  • 1993  (3)
  • 1979  (1)
  • 1
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    Phasing operator for two oscillators in classical field (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The origin of Dicke cooperative states was studied by considering two harmonic oscillators driven by a common field of radiation. The origin is assumed for superradiance in a system of molecules where no mutual interactions exist, but all of the molecules encounter the same field of radiation. A phasing operator as Phi(sub Nu) equals D(alpha) + P(sub Nu)D(alpha), where D(alpha) is the displacing operator and P(sub Nu) the projection operator for constant energy Nu for two oscillators, was derived. The eigenstates of the phasing operator Phi are found to show a finite correlation as in the Dicke cooperative states.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA. Goddard Space Flight Center, The Second International Workshop on Squeezed States and Uncertainty Relations; p 143-148
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The dispersed fluorescence spectrum of NaAr - Ground and excited state potential curves (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Potential curves for the ground state and the first excited state of NaAr were determined. The van der Waals molecule NaAr was prepared by supersonic free jet expansion of a mixture of sodium, argon, and helium. The electronic transition from the ground state to the first excited state A2pi was excited by a tunable dye laser and the resulting fluorescence was studied. The dispersed fluorescence spectra show discrete and diffuse features, corresponding to transitions from excited vibrational levels of the A state to bound and unbound levels of the x state. The characteristic reflection structure in the bound-free spectra permits an unambiguous assignment of the vibrational numbering in the A state, and this assignment together with previously measured spectroscopic constants are used to calculate the potential curve of the A state. The discrete structure in the fluorescence spectra is used to determine the potential curve of the x state in the well region, and the repulsive part of the X curve is then deduced through trial-and-error simulation of the bound-free spectra.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 71; Aug. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Remarks about massive and massless particles in supersymmetry (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The internal space-time symmetry and simple supersymmetry of relativistic particles are briefly discussed in terms of the little group of the Poincare group. The little group generators in a finite-dimensional matrix representation of the N = 1 super-Poincare algebra are explicitly constructed. The supergeometry of a massive case continuously becomes that of a massless case in the infinite-momentum limit. The origin of the gage transformations associated with the massless supermultiplets becomes transparent in that limit.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA. Goddard Space Flight Center, Workshop on Harmonic Oscillators; p 255-260
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    NASA TECHNICAL REPORTS
  • 4
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    Condensed-matter energetics from diatomic molecular spectra (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Analyses of molecular spectra and compression data from crystals show that a single function successfully describes the dependence on interatomic separation of both the potential energy of diatomic molecules and the cohesive binding energy of condensed matter. The empirical finding that one function describes interatomic energies for such diverse forms of matter and over a wide range of conditions can be used to extend condensed-matter equations of state but warrants further theoretical study.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Science (ISSN 0036-8075); 260; 5108; p. 649-652.
    Format: text
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    NASA TECHNICAL REPORTS
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