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A systematic survey of ions that could be responsible for features in theoptical spectra of supernovae is carried out. Six different compositions thatcould be encountered in supernovae are considered. For each composition, theLTE optical depth of one of the strongest optical lines of each ion is plottedagainst temperature. For each ion that can realistically be considered as acandidate to produce identifiable features in supernova spectra, a samplesynthetic spectrum is displayed. The optical depth plots and the syntheticspectra can provide guidance to studies of line identifications in the opticalspectra of all types of supernovae during their photospheric phases.

Ion Signatures in Supernova Spectra