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in creator/contributor: "Smith, D. B."  
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Multiphoton ionization of (Xe)/sub n/ and (NO)/sub n/ clusters using a picosecond laser

Description: In an effort to extend the application of multiphoton ionization (MPI) spectroscopy to the study of weakly bound systems, we have begun a systematic investigation of picosecond MPI in van der Waals molecules and clusters. To our knowledge no previous picosecond MPI studies of weakly bound systems have been reported. We present here results of picosecond MPI of Xe/sub n/(n = 1-20) and (NO)/sub n/(n = 1-4) clusters. Previous MPI studies using nanosecond lasers have not detected the NO cluster ser… more
Date: January 1, 1989
Creator: Smith, D. B. & Miller, J. C.
Partner: UNT Libraries Government Documents Department
open access

Picosecond multiphoton ionization of atomic and molecular clusters

Description: High peak-power picosecond laser pulses have been used for the first time to effect nonresonant or resonant multiphoton ionization (MPI) of clusters generated in a supersonic nozzle expansion. The resulting ions are subsequently detected and characterized by time-of-flight mass spectroscopy. Specifically, we present results involving MPI of clusters of xenon and nitric oxide. Previous MPI studies of many molecular clusters using nanosecond lasers have not been successful in observing the parent… more
Date: January 1, 1990
Creator: Miller, J. C. & Smith, D. B.
Partner: UNT Libraries Government Documents Department
open access

Thermographic properties of eight blue-emitting phosphors

Description: We examined the effect of temperature on the light absorption and emission properties of eight phosphorescent compounds. These phosphors are commercially produced powders that emit mainly in the blue region when illuminated with ultraviolet light in the range 220 to 400 mn. Excitation and emission spectra measured over the range 20 to 350{degrees}C are examined for these phosphors. Data from the emission spectra indicate that there is a significant temperature dependence in this temperature ran… more
Date: May 1, 1993
Creator: Cunningham, D. M.; Allison, S. W. & Smith, D. B.
Partner: UNT Libraries Government Documents Department
open access

Fiber optic temperature sensor using a Y{sub 2}O{sub 2}S:Eu thermographic phosphor

Description: This report details the development and testing of a thermographic-phosphor-based fiber-optic temperature sensor. The sensor is constructed by removing a region of the fiber jacket and cladding, then coating the exposed core with yttrium oxysulfide doped with a europium activator (Y{sub 2}O{sub 2}S:Eu). When photoexcited, the europium in the host lattice emits a sharp-line fluorescence spectrum that is characteristic of the temperature of the host crystal lattice. By measuring fluorescence life… more
Date: September 1, 1993
Creator: Smith, T. V. & Smith, D. B.
Partner: UNT Libraries Government Documents Department
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