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Showing 1 to 2 of 2 for “"U band"”.
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The U center in potassium bromide crystals
The optical bleaching of the U band in potassium bromide crystals at 78°K has been investigated. The nature of the secondary bands, the U' and the Ul bands, was studied. The U' band consisted of component bands, including the a band which is due to exciton transitions near a negative ion vacancy. …
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Optical and X-ray studies of newly discovered flare stars
… AU = 3.8 mag flare, emitting an energy in the U-band of Eu lx 10 erg. Three other flares had AU > 2.2 mag. The flaring rate of two of these new stars is shown to be comparable to that of famous flare stars. The high time-resolution spectra (AA3600-4200A) obtained simultaneously during the large …