The ground state infrared spectra of four diatomic deuterides (GaD, InD, TlD, AgD) and the determination of mass-independent molecular parameters

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Abstract
The infrared spectra of two isotopic forms of the monodeuterides of the metals gallium, indium, thallium, and silver have been measured in their ground electronic state (1Σ) in the gas phase using a diode laser spectrometer. The analysis of the experimental data was carried out in two ways: (a) a complete set of Dunham parameters was determined for each isotopic species independently and (b) all the available data over both deuterated and protonated species of a particular compound were simultaneously fitted to obtain a set of mass‐independent parameters. Mass scaling coefficients, which take into account effects arising from a breakdown of the Born–Oppenheimer approximation, were determined for the hydrogen atom.