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  • ASTROPHYSICS  (1)
  • INORGANIC AND PHYSICAL CHEMISTRY  (1)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
  • Nuclear Physics  (1)
  • 1
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    Probing the Single-Particle Character of Rotational States in $^{19}\mathrm{F}$ Using a Short-Lived Isomeric Beam (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-03-24
    Description: Author(s): D. Santiago-Gonzalez, K. Auranen, M. L. Avila, A. D. Ayangeakaa, B. B. Back, S. Bottoni, M. P. Carpenter, J. Chen, C. M. Deibel, A. A. Hood, C. R. Hoffman, R. V. F. Janssens, C. L. Jiang, B. P. Kay, S. A. Kuvin, A. Lauer, J. P. Schiffer, J. Sethi, R. Talwar, I. Wiedenhöver, J. Winkelbauer, and S. Zhu A beam containing a substantial component of both the J π = 5 + , T 1 / 2 = 162     ns isomeric state of F 18 and its 1 + , 109.77-min ground state is utilized to study members of the ground-state rotational band in F 19 through the neutron transfer reaction ( d , p ) in inverse kinematics. The resulting spectroscopic s... [Phys. Rev. Lett. 120, 122503] Published Fri Mar 23, 2018
    Keywords: Nuclear Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Can the chirality of the ISM be measured (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Many moderately complex carbon-based molecules of the type associated with biological systems can exist in one of two mirror-image forms (left-handed and right-handed), which can be distinguished on the basis of their influence on the state of polarization of a light beam. Both forms are possible in nature; yet in living organisms it is invariably the rule that one of these two species predominates. This gives rise to a net chirality. One possible explanation for the net chirality is that the early earth was somehow seeded from the ISM with an excess of chiral organic compounds which led to the development of life forms which are based on left-handed amino acids and right-handed sugars. Molecular spectroscopy of the interstellar medium (ISM) has revealed a complex variety of molecular species similar to those thought to have been available in the oceans and atmospheres of the earth at the time life formed. The detection of such molecules demonstrates the generality of the chemical processes occurring in both environments. If this generality extends to the processes which produce chirality, it may be possible to detect a net chirality in the ISM. This is of particular interest because determining whether or not net chirality exists elsewhere in the universe is an essential aspect of understanding how life developed on earth and how widely distributed it might be. Researchers report preliminary results of a feasibility study to determine whether or not a net chirality in the ISM can be measured. If laboratory results identify candidate chiral molecules that might exist in the ISM, the next step in this feasibility study will be to estimate the detectability of the chiral signature in astrophysical environments.
    Keywords: ASTROPHYSICS
    Type: Carbon in the Galaxy: Studies from Earth and Space; p 337-338
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Fourier emission infrared microspectrophotometer for surface analysis. I - Application to lubrication problems (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A far-infrared interferometer was converted into an emission microspectrophotometer for surface analysis. To cover the mid-infrared as well as the far-infrared the Mylar beamsplitter was made replaceable by a germanium-coated salt plate, and the Moire fringe counting system used to locate the moveable Michelson mirror was improved to read 0.5 micron of mirror displacement. Digital electronics and a dedicated minicomputer were installed for data collection and processing. The most critical element for the recording of weak emission spectra from small areas was, however, a reflecting microscope objective and phase-locked signal detection with simultaneous referencing to a blackbody source. An application of the technique to lubrication problems is shown.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Analysis of infrared emission from thin adsorbates (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Fuel and lubricant deposits on solid surfaces, though often of similar visual appearance, differ in composition, depending on the nature of the deposit formers and the circumstances of deposition. To help establish these relations an Infrared Emission Fourier Polarization Microspectrophotometer was constructed to record infrared spectra from the deposits on their original support. By focussing on small aggregates with a reflecting microscope objective and by discriminating against the randomly polarized blackbody radiation with a rotating polarizing filter phase-locked to an amplifier, excellent Fourier emission spectra of polarized bands could be obtained. In many instances, the microscope objective was adequate without the polarizer. The analysis was calibrated against a very thin film of polyethylene terephthalate attached to a highly reflective aluminum mirror on the sample positioner.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: In: International Conference on Fourier Transform Infrared Spectroscopy; Jun 08, 1981 - Jun 12, 1981; Columbia, SC
    Format: text
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    NASA TECHNICAL REPORTS
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