Titanium Oxide Bands in the Orange, Red and Infra-Red Region

BANDS in the region of λ5600 to λ8000 have been analysed into at least two systems, distinct from that of the blue-green region, previously analysed by Birge and Christy (Phys. Rev., vol. 29, p. 212; 1927. Abstract. NATURE, vol. 122, p. 205; 1928). One of these in the orange is a singlet system due to the electronic transition 1P – 1S, the other a triplet system in the red and infra-red due to the transition 3S – 3P. Of the former only one sequence has yet been found; of the latter, four have been determined, namely, the (0, 1), (0, 0), (1, 0) and (2, 0), the δv separations of the triplet heads of the (0, 0) sequence being 66.7 and 74.6 cm.-1 respectively.