Knowledge Bank

“The microwave spectra of $(CH3)2CHBr79,(CH3)2CHBr31$, and $(CH3)2C13HBr79$ have been examined and a number of rotational transitions assigned. Preliminary values of the rotational constants for the bromine-79 species are A =8030.6 Mc. B=2917.67 Mc, and C=2295.38 Mc. The CBr bond distance computed by the substitution method is 1.902 {\AA}. The quadrupole coupling constants along the principal inertial axes, as obtained by first-order calculations, are $\chi aa=477.9MC,\chi bb=-262.9$ Mc, and $\chi ee=-215.1$ Mc for the Br-79 species. Progress toward correcting for evident second-order quadrupole effects in the hyperfine splittings will be discussed.”