Spin—Rotation Interaction and Magnetic Shielding in OF2

High-resolution microwave spectroscopy has been used to study the spin—rotation interaction of the two 19F nuclei in OF2. Several transitions were resolved from J=9 to J=26 where half-widths at half-heights of 12–15 kc/sec were obtained. The chemical shift of the 19F nucleus was also measured. The value of the magnetic shielding relative to F in CFCl3 is −249±1 ppm. The paramagnetic component of the shielding in OF2(σOF2p) is then related to the paramagnetic shielding in F2(σF2p) yielding σOF2p—σF2p=205×10−6. σF2p can be computed from the known spin—rotation constant in F2 yielding σOF2p=−569×10−6. This data is then combined with the microwave data on the spin—rotation interaction in OF2 to yield Maa=−42kc/sec, Mbb=−22 kc/sec, and Mcc=−49 kc/sec.