The Nuclear Quadrupole Moment ofN14and the Structure of Nitrogen Trifluoride from Microwave Spectra

Measurements of the $J=1\mathrm{}\to 2$ rotational transitions of ${\mathrm{N}}^{14}$ ${\mathrm{F}}_3$ and ${\mathrm{N}}^{15}$ ${\mathrm{F}}_3$ yield the following molecular and nuclear properties. For ${\mathrm{N}}^{14}$ ${\mathrm{F}}_3$, ${\mathrm{B}}_0$=10,680.96 Mc/sec., $I_{\mathrm{B}}=78.5475\mathrm{}\times {10}^{-40\mathrm{}}$ g ${\mathrm{cm}}^2$; for ${\mathrm{N}}^{15}$ ${\mathrm{F}}_3$, ${\mathrm{B}}_0$=10,629.35 Mc/sec., ${\mathrm{I}}_{\mathrm{B}}$=78.9291×${10}^{-40\mathrm{}}$ g ${\mathrm{cm}}^2$. The molecular dimensions are: $d_{\mathrm{NF}}=1.371\mathrm{}$ A and ∠FNF=102° 9′. The nuclear quadrupole coupling of ${\mathrm{N}}^{14}$ is -7.07 Mc/sec. This yields +0.01×${10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$ as the most probable value of the nuclear quadrupole moment of ${\mathrm{N}}^{14}$.