The Spectrum and Term System of Ti I

The emission spectrum of neutral titanium has been analysed in the region 1750 - 55 000 Å. For the registrations in the infrared and visible wavelength regions, the Fourier transform spectrometer at Kitt Peak National Observatory has been used, while the recordings in the ultraviolet are from the 10.7-m Eagle spectrograph at National Bureau of Standards, Washington, D.C. In addition to this, a study of the absorption spectrum in the region 1900 - 2315 Å has been performed using plates obtained from Harvard College Observatory. A total of 3377 lines have been identified as belonging to the Ti I spectrum, combining 439 energy levels. About 115 new energy levels have been found. Almost 15% of the previously listed level values have been discarded but a majority of these could be replaced with new values.