Abstract
The infrared spectra of the monodeuteride of aluminium has been measured in the gas phase in its ground electronic state ( 1Σ) using a diode laser spectrometer. These experimental results were combined with those available for AlH from infrared Fourier transform spectra of the ν=2→0 sequence bands in order to calculate a set of mass-independent parameters and mass scaling coefficients. A set of Dunham parameters was also determined from the AlD data. The values of the mass scaling coefficients of the hydrides of four group IIIa metals are discussed.
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