Accession Number : ADA302776

Title :   Spectral Characteristics of an Aerogel.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Morrison, Robert J.

PDF Url : ADA302776

Report Date : 27 DEC 1995

Pagination or Media Count : 72

Abstract : The spectra of an aerogel bombarded with high energy (0.5-1.0 MeV) protons, H2(+), and H3(+) have been measured and investigated. The spectra from the excited gel are essentially continue peaking in the blue (lambda 4500 A), and cannot be explained by the spectral lines from known participating elements or a blackbody. They are due to luminescence. Wavelength scans taken before, inside, and behind the gel gave different spectra. The continuum's spatial intensity was independent of the particle energy, but the location of the intensity maximum moved further downstream inside the gel as the particle energy increased. The spatial intensity maintained the same shape, but its shape depended on the wavelength viewed. Instantly after the beam initially strikes the gel, a large explosion of light is emitted. The burst is followed by a very fast (0.8 sec) and then slower (4 sec) decay of radiation lambda 4500 A, which depended on wavelength. jg p3

Descriptors :   *SPECTRA, *GELS, SCANNING, FREQUENCY, SPATIAL DISTRIBUTION, EXCITATION, ENERGY, INTENSITY, LIGHT, EXPLOSIONS, THESES, PROTONS, HYDROGEN, GASES, HIGH ENERGY, PARTICLES, BLACKBODY RADIATION, LUMINESCENCE, DECAY, SPECTRAL LINES.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Laminates and Composite Materials
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE