The Rotational Zeeman Effect of Methyl-and Silylbromide

Abstract

The rotational Zeeman effect of the J→J' = 0→1, K = 0 transition has been investigated for CH 3 81 Br and SiH 3 81 Br under high resolution. The shielding constant for the 81 Br-nucleus in these molecules has been determined from the spectra and is compared to the values calculated from the spin-rotation coupling constants. The sign of the electric dipole moment in SiHßBr is shown to be ⊕H3SiBr⊕. From the Zeeman effect of two K ≠ 0 transitions of SiH 3 Br, g || is determined to be negative for SiH a Br, in contrast to CH 3 Br, where g || is positive