The infrared spectrum of the AsH2D molecule has been measured in the region of the three bending fundamental bands on a Fourier transform spectrometer with a resolution of 0.0024 cm-1 and analyzed for the first time. More than 7500 normally allowed and in addition about 600 forbidden, but perturbation-activated transitions with Jmax = 21, Kamax = 20 and Kcmax = 21 have been assigned to the bands ν3, ν4, and ν6. The measured transition wavenumbers were used to determine 1047 upper energy values. These energies were fitted with a Watson-type Hamiltonian in A reduction and IIIl representation taking into account resonance interactions between all three bending states, (001000), (000100), and (000001) and led to a physically meaningful set of 25 diagonal and 52 resonance spectroscopic parameters. These reproduce the experimental energies with an rms deviation of 0.00021 cm-1, which is close to the experimental uncertainty.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry