Microwave optical double resonance spectroscopy of ND2 in (000) of X̃ 2B1

Abstract

Microwave optical double resonance spectroscopy has been used to observe in excess of 200 microwave transitions involving 21 rotational levels in the (000), X̃ ²B₁ state of ND₂. The observed transitions have been fitted to two model Hamiltonians. In the first fit, accurate values for the spin rotation constants and ²D hyperfine constants were determined. The ²D hyperfine constants are in excellent agreement with those calculated from ¹H parameters in NH₂, (000) X̃ ²B₁. In the second fit, only the constants of the Hamiltonian describing the spin‐rotation effect were determined. The derived spin‐rotation parameters for ND₂ (A_s, B_s, C_s, Δ^s_K, Δ^s_N, Δ^s_NK + Δ^s_KN, δ^s_K, and δ^s_N) are compared to the appropriate scaled constants of NH₂.