We have measured 43 transitions centered at 1972 cm-1 in the (011)-(001 ) bending hot band of the azide ion (N3- ) using diode laser velocity modulation spectroscopy of an NH3/N 2O discharge. The data, ranging from P(32) to R(40), were fit to a standard ι-type doubling Hamiltonian through quartic terms. The ι splittings in the spectrum were unusually large compared with similar molecules. Intensity measurements indicate that the vibrational and rotational degrees of freedom are equilibrated, unlike the case for isoelectronic NCO-. Additional lines of the ν3 fundamental have also been measured, which further refine the values of the ground state parameters.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry