Rotational Analysis of Yellow and Near Infrared Bands in ThO

Three new systems in the molecular spectrum of ThO have been rotationally analysed. They are located in the yellow region of the spectrum. Two bands at 5600 and 5615 Å are the 0-0 and 1-1 bands of a system named P-H . One band at 5613 Å is another 0-0 band of a system called O-H . The states O and P both have Ω = 0 with different symmetries. Another band at 5579 Å is also analysed. Its position in the term scheme of ThO is unknown. New measurements and an extended analysis of the previously investigated G-H transition have been performed. A term scheme and a table of molecular constants for all known states in ThO is given.