Line positions and intensities for the ν 3 band of 5 isotopologues of germane for planetary applications

Highlights: • New measurements of germane line in the 2100 cm${}^{-1}$ region are presented. • Line intensities for the five isotopologues are measured for the first time. • An accurate model of the absorption of germane is obtained. • The results will help to interpret planetary data, like those of the Juno mission around Jupiter. The germane molecule, GeH₄, is present in the atmospheres of giant planets Jupiter and Saturn. The ongoing NASA mission Juno has renewed interest in its spectroscopy, whose accurate modeling is essential for the retrieval of other tropospheric species. We present here the first complete analysis and modeling of line positions and intensities in the strongly absorbing ν₁/ν₃ stretching dyad region near 2100 cm${}^{-1},$ for all five germane isotopologues in natural abundance. New infrared spectra were recorded, absolute intensities were extracted through a careful procedure and modeled thanks to the formalism and programs developed in the Dijon group. A database of calculated germane lines, GeCaSDa, has been build and is available online through the Virtual Atomic and Molecular Data Centre (VAMDC) portal and at http://vamdc.icb.cnrs.fr/PHP/gecasda.php.