MICROWAVE STUDIES OF $\tilde{A}$, NHD AND $\tilde{X}, ND_{2}$ USING MICROWAVE OPTICAL DOUBLE RESONANCE

Abstract

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 $ND_{2}$. The studies of NHD have focussed on determining magnetic hyperfine coupling constants for $^{14}N$ and $^{1}H (^{2}D)$ in the $\Pi(0, 10, 0)$ and (0, 10, 0) vibration states of the $\tilde{A} {^{2}A^{1}}$ state. Over 100 hyperfine components involving 11 magnetic dipole transitions of the type, $^{N}K_{a}K_{C}, J-N-1_{2} \leftrightarrow J-N + 1_{2}$, and one electric dipole transition. $2_{20}, F_{1} \leftrightarrow 2_{21}$. $F_{2}\Delta (0, 11, 0)$, have been observed. For $ND_{2}$, over 200 microwave transitions, all of the magnetic dipole type, were observed from 21 rotational states in (0, 0, 0) of $\tilde{X} B_{1}$. The chief motivation behind the work was to determine accurate spin-rotation and spin-rotational centrifugal distortion constants.