A conventional laser Raman spectrometer has been modified and used to obtain useful Raman spectra from discrete solid particles as small as 0.7 µm in linear dimensions. Spectra obtained from single, micrometer-sized particles of several inorganic and organic compounds are reported. Simplified calculations are discussed which provide an estimate of detectability levels and other problems associated with these measurements. Certain parameters that must be considered in the design of an instrument especially intended for use in the chemical characterization of single fine particles are reviewed in the light of this work.
Uranyl and europium ion-doped fibres of 5-45 pm diameter were prepared which emit in the green and red spectral regions, respectively. Measurements were made of fluorescence flux as a function of fibre length, dopant concentration, slit shape and fibre diameter. The Aux was found to be proportional to fibre length and fluorophor concentration and proportional to the square of the fibre radius. In addition, the fluorescence flux as a functio,n of aperture size and shape and fibre position has been measured experimentally and compared to computer generated fluorescence flux envelopes. It is suggested that inorganic ion-doped fibres are suitable for use as microspectrofluorimetric standards.
The gamma radiations of Y 92 have been investigated with a scintillation spectrometer. The Y 92 was produced in a cyclotron by a (d,a) reaction on zirconium and was not contaminated with Y 91 or Y 93 isotopes present in fission product solutions. Gamma rays of 0.21=fc0.01, 0.475db0.02, 0.94db0.03, 1.45±0.10, 1.9 ±0.10, and 2.4±0.10 Mev have been observed and both ft-y and 7-7 coincidences of the lower-energy lines tabulated. A decay scheme is proposed which is consistent with the experimental data and with recent data on Nb 92 and Nb 92m reported in the literature.
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