A determination of the molecular parameters for NiH in its 2Δ ground state by laser magnetic resonance
Abstract
The rotational spectrum of the NiH radical in the v = 0 level of its X2Δ state has been studied by laser magnetic resonance (LMR) at far-infrared wavelengths. Transitions have been detected for all five isotopes of nickel and within both the lower ( 2Δ{5}/{2}) and upper ( 2Δ{3}/{2}) spin components. Nuclear hyperfine splittings for both the proton and 61Ni ( I = {3}/{2}) are observed. The effective Zeeman Hamiltonian for a molecule in a 2 S+1 Δ state is developed and used to fit all the available data for NiH in the v = 0 level. This includes the magnetic resonance observations of the (1,0) vibration-rotation band and the fine structure transitions in the v = 0 level (also by LMR) and the lambda-doubling intervals for the 2Δ{3}/{2} component. There are several indications that this exercise is only just possible in the case of NiH in its X2Δ state. The results are used to determine the equilibrium bond length of NiH, re = 0.14694493(63) nm.
- Publication:
-
Journal of Molecular Spectroscopy
- Pub Date:
- August 1991
- DOI:
- 10.1016/0022-2852(91)90402-V
- Bibcode:
- 1991JMoSp.148..462N