On the Nuclear Spin ofB10

From measurements on the fine structure of the $J=0\mathrm{}\to 1$ rotational transition of ${\mathrm{H}}_3$ ${\mathrm{B}}^{10}$CO near 17,960 Mc/sec. we are able to establish that the spin of ${\mathrm{B}}^{10}$ is 3 as had previously been reported by Gordy, Ring, and Burg. A quadrupole coupling constant of 3.44±0.1 has also been determined for this molecule. A brief description of our spectroscope is included.