TABSTRACE, © 0 — .\s ee ° The highe resolution ultraviolet and visible spectra of typical test nuciear detonations ug gto" ‘. and including Operation Ivy have been analyzed and compared. Topica studied include the types.of atomic and molecular material observed (with calculations, in some cases, of the relative . Quantities involved), theultraviolet cutoff, and rotational temperatures.- Variation of these quantities with the radiochemical yield of the bombis indicated.