Microwave rotation-inversion spectrum of ${\mathrm{NT}}_3$

The rotation-inversion spectrum of ${}_{}{}^{14}{}_{}{}^{}\mathrm{NT}_3^{}{}_{}{}^{}$ in the ground vibrational state has been measured with high-resolution microwave techniques in the frequency range of 210-633 GHz. Components of the $J=0\mathrm{}\to 1, 1\to 2, \mathrm{and} 2\to 3$ transitions were observed. Analysis of the results yielded the following rotational constants: $B_0=105565.373\mathrm{}\pm 0.034$ MHz, $D_J=2.5981\mathrm{}\pm 0.0024$ MHz, and $D_{JK}=-4.472\mathrm{}\pm 0.006$ MHz, with the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ nuclear quadrupole coupling $eqQ=-4.170\mathrm{}\pm 0.049$ MHz. The inversion frequency, corrected for rotational distortion, was found to be 305.89 ± 0.11 MHz. Molecular substitution structures obtained were bond length 1.0132 ÅA and bond angle 107° 13' for the combination ${}_{}{}^{14}{}_{}{}^{}\mathrm{NH}_3^{}{}_{}{}^{}$: ${}_{}{}^{15}{}_{}{}^{}\mathrm{NH}_3^{}{}_{}{}^{}$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{NT}_3^{}{}_{}{}^{}$; bond length 1.0128 ÅA and bond angle 107° 2' for the combination ${}_{}{}^{14}{}_{}{}^{}\mathrm{ND}_3^{}{}_{}{}^{}$: ${}_{}{}^{15}{}_{}{}^{}\mathrm{ND}_3^{}{}_{}{}^{}$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{NT}_3^{}{}_{}{}^{}$.