A. V. LAPINOV, G. YU. GOLUBIATNIKOV, Institute of Applied Physics of RAS, 46 Ulyanov str., 603950 Nizhny Novgorod, Russia; A. P. VELMUZHOV, Institute of Metalloorganic Chemistry of RAS, 49 Tropinin str., 603950 Nizhny Novgorod, Russia; J.-U. GRABOW, Institute of Physical Chemistry and Electrochemistry, Leibniz University of Hannover, Callinstrasse 3A, 30167 Hannover, Germany; AND A. GUARNIERI, Technical Faculty of Christian Albrecht University of Kiel, Kaiserstrasse 2, 24143 Kiel, Germany.
We report results of precise sub-Doppler spectroscopy of HC3N, H13CCCN, HC13CCN, HCC13CN and HCCC15N at 45-510~GHz with Lamb-dip spectrometer of IAP RAS. Hf structure of rotational transitions of all above species below 27 GHz as well as inversion transitions of NH3(1,1) and (2,2) were measured using FTMW spectrometer of University of Hannover. New comparison of HC3N and NH3 laboratory frequencies with radio astronomical observations of dark clouds , shows an upper limit of me/mp variation in our Galaxy as \le3 10-9.