The molecular Zeeman effect of 2‐fluoropropane. A high resolution microwave fouriertransform study

A microwave Fouriertransform spectrometer, developed for rotational Zeeman effect studies is described. Its high resolution capabilities are demonstrated by the analysis of the dense Zeeman multiplets of 2-fluoropropane. The diagonal elements of the molecular g-tensor as referred to the principal inertia axes system are obtained as gaa = −0.00794(13), gbb = +0.00722(08), and gcc = −0.01051(11). The two independent molecular magnetic susceptibility anisotropies are obtained as 2χaa - χbb -χcc = −2.77(34) · 10−6 erg G−2 mol−1 and 2χbb - χcc - χaa = −5.40(20) · 10−6 erg G−2 mol−1. The observed magnetic susceptibilities are compared with those observed earlier for propane and are discussed successfully within the model of local atom susceptibilities.