“…There is medium strength absorption from 2500 to 3400Å which is usually attributed to theB 1 B 1 -X 1 A 1 electronic transition. It has complex vibrational and rotational structures (Brand and Nanes 1973, Brand and Srikameswaran 1972, Brand et al 1976a,b, Duchesne and Rosen 1947, Hamada and Merer 1974, 1975, Herzberg 1966, Price and Simpson 1938 (Hillier and Saunders 1971, Brand et al 1976b, Kullmer and Demtroder 1984, 1985, 1986. Finally, there is a strong absorption band system, beginning near 2350Å and continuing below 2000Å , which has been assigned as theC 1 B 2 -X 1 A 1 electronic transition.…”