Knowledge Bank

Further progress on the methyl alcohol spectrum is reported. A series of absorption lines of $C12H3O16H$ has been followed from J = 2 up to J = 30. The corresponding series for $C13H3O16H$ and $C12H3O18$ H have been found and measured up to J = 31 and J = 26, respectively. The lines of these three series have first-order Stark effects. About twenty lines have been found which have a second-order Stark effect. Some of these are grouped in a way which suggests that they are due to transitions between K-type doublets. Altogether for the three isotopic molecules about 140 lines have been measured and classified according to the order of their Stark effects. J-values have been determined and quantitative Stark effect measurements have been made in many cases.