High resolution millimeter-wave spectrum of methyl bromide. Spin–rotation and nuclear shielding tensors of bromine

Abstract

The ground state rotational spectrum of CH3 Br has been observed using a molecular beam-absorption spectrometer. The B rotational constant and the quartic and sextic centrifugal distortion constants are determined with great accuracy. From the hyperfine splitting the quadrupole coupling constant and the spin–rotation constants of the two isotopic species 79Br and 81Br can also be deduced. These data are used to determine the elements of the bromine nuclear magnetic shielding tensor.