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  • ATOMIC AND MOLECULAR PHYSICS  (4)
  • 1990-1994  (3)
  • 1975-1979  (1)
  • 1965-1969
  • 1925-1929
  • 1992  (3)
  • 1979  (1)
  • 1
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    The low-energy, charge-transfer excited states of 4-amino-4-prime-nitrodiphenyl sulfide (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Absorption and emission spectra of 4-amino-4-prime-nitrodiphenyl sulfide in polar and nonpolar solvents were used to characterize and assign the low-energy excited states of the molecule. Fluorescence-excitation anisotropy spectra and fluorescence quantum yields were also used to characterize the photophysics of these states. The lowest-energy fluorescent singlet state was determined to be an intramolecular charge transfer (ICT) state involving transfer of a full electron charge from the amino to the nitro group yielding a dipole moment of about 50 D. A low-energy, intense absorption band is assigned as a transition to a different ICT state involving a partial electron charge transfer from sulfur to the nitro group.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics (ISSN 0021-9606); 97; 6, Se; 4018-402
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Radiation force on a single atom in a cavity (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: We consider the radiation pressure microscopically. Two perfectly conducting plates are parallelly placed in a vacuum. As the vacuum field hits the plates they get pressure from the vacuum. The excessive outside modes of the vacuum field push the plates together, which is known as the Casimer force. We investigate the quantization of the standing wave between the plates to study the interaction between this wave and the atoms on the plates or between the plates. We show that even the vacuum field pushes the atom to place it at nodes of the standing wave.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA. Goddard Space Flight Center, Workshop on Squeezed States and Uncertainty Relations; p 217-224
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Atomic oxygen undercutting of LDEF aluminized-Kapton multilayer insulation (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Atomic oxygen undercutting is a potential threat to vulnerable spacecraft materials which have atomic oxygen protective coatings. Such undercutting is due to atomic oxygen attack of oxidizable materials at microscopic defects in the protective coatings. These defects occur during fabrication and handling, or from micrometeoroid and debris bombardment in space. An aluminized-polyimide Kapton multilayer insulation sample that was located on the leading edge of the Long Duration Exposure Facility (LDEF) was used to study low Earth orbit directed ram atomic oxygen undercutting. Cracks in the aluminized coatings located around vent holes provided excellent defect sites for evaluation of atomic oxygen undercutting. The experimentally observed undercutting profiles were compared to predictions from Monte Carlo models for normal incident ram atomic oxygen attack. The shape of the undercut profile was found to vary with crack width, which is proportional to the number of oxygen atoms entering the crack. The resulting profiles of atomic oxygen which occurred on LDEF indicated wide undercut cavities in spite of the fixed ram orientation. Potential causes of the observed undercutting are presented. Implications of the undercutting profiles relevant to the Space Station Freedom are also discussed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA. Langley Research Center, LDEF: 69 Months in Space. First Post-Retrieval Symposium, Part 2; p 781-795
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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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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