MILLIMETER AND SUBMILLIMETER-WAVE SPECTRUM OF AMINOACETONITRILE (NH$_{2}$CH$_{2}$CN)

Author Institution: Department of Environmental Science, Toho University, 2-2-1 Miyama, Funabashi, 274-8510, Japan; Department of Physics, University of Toyama, 3190 Gofuku, Toyama, 930-8555, JapanAminoacetonitrile (NH$_{2}$CH$_{2}$CN) draws an attention with respect to a synthesis of amino acid in interstellar space, as it is considered to be a direct precursor of the simplest amino acid, glycine. Recently the molecule was detected toward SgrB2(N) \&\textit{A}, 482, 179 (2008)}, in which spectral line frequencies are predicted on the basis of the previous millimeter-wave study, 143, 180 (1990)}. We have measured pure rotational spectrum of aminoacetonitrile in the millimeter and the submillimeter-wave region. About 300 spectral lines including both a-type and b-type transitions were recorded up to 661 GHz, and centrifugal distortion constants up to the octic term were precisely determined. We had to reinvestigate most of the b-type transition lines due to wrong assignments in the previous study. The updated frequency catalogue of the aminoacetonitrile are now accurate enough for astronomically search up to 1000 GHz