HNSi; ν1emission band by high resolution Fourier transform spectroscopy

The emission spectrum of the fundamental vibration–rotation ν1 band (NH stretch) of iminosilicon HNSi has been observed near 2.7 μm by high resolution Fourier transform spectroscopy from a mixture of N2+SiH4 excited in a radio frequency discharge. This is the first spectroscopic observation of this molecule in the gas phase. Molecular constants σ, B, D, H are reported. Calculated microwave transitions which should be helpful for the investigation and the possible identification of HNSi in astrophysical sources are also given.