Zeeman Effect of Some Linear and Symmetric-Top Molecules

Abstract

The Zeeman effect in the microwave rotational spectra of some linear molecules and symmetric-top molecules has been investigated. The rotational $g$ factors obtained are in nuclear magnetons: $\mathrm{}\left|g\right|=0.0295\mathrm{}\pm 0.005$ for OCS; $\mathrm{}\left|g\right|=0.268\mathrm{}\pm 0.005$ for CO. In the symmetric-top molecules the components of the rotational $g$ factor along the symmetry axis, $g_K$, and perpendicular to this axis, $g_{\perp }$, were measured as follows: $\left|g_{\perp }\right|=0.0624\mathrm{}\pm 0.005$ and $(g_{\perp }-g_K)=0.549\mathrm{}$ for C${\mathrm{H}}_3$F; $\left|g_{\perp }\right|=0.03\mathrm{}$ for C${\mathrm{F}}_3$H; $g_{\perp }\approx 0$ and $g_K=0.298\mathrm{}\pm 0.006$ for C${\mathrm{H}}_3$CCH; $g_{\perp }\approx 0$ and $g_K=0.31\mathrm{}\pm 0.01$ for C${\mathrm{H}}_3$CCD; $\left|g_{\perp }\right|=0.065\mathrm{}\pm 0.01$ for P${\mathrm{F}}_3$; $\left|g_{\perp }\right|=0.03\mathrm{}$ for PO${\mathrm{F}}_3$. The rotational $g$ factor for OCS was measured with several different transitions up to $J=13\mathrm{}\to 14$ and was found to be a constant, independent of $J$ within the accuracy of the measurements.