Knowledge Bank

Microwave optical double resonance spectroscopy has been used to study microwave transitions in the 1.5 CHz-12.4 CHz spectral region for both NHD and $ND2$. The studies of NHD have focussed on determining magnetic hyperfine coupling constants for $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}N$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}H(2D)$ in the $\Pi (0,10,0)$ and (0, 10, 0) vibration states of the $A~\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}A1$ state. Over 100 hyperfine components involving 11 magnetic dipole transitions of the type, , and one electric dipole transition. $220,F1\leftrightarrow 221$. $F2\Delta (0,11,0)$, have been observed. For $ND2$, over 200 microwave transitions, all of the magnetic dipole type, were observed from 21 rotational states in (0, 0, 0) of $X~B1$. The chief motivation behind the work was to determine accurate spin-rotation and spin-rotational centrifugal distortion constants.