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Ethyl cyanide is an abundant molecule in hot molecular clouds. Lines from 13Cisotopically substituted ethyl cyanide were identified in Orion. To enable thesearch and the possible detection of other isotopologues of ethyl cyanide ininterstellar objects, we have studied the rotational spectrum of deuteratedethyl cyanide: CH2DCH2CN (in-plane and out-of-plane) and CH3CHDCN and thespectrum of15N substituted ethyl cyanide CH3CH2C15N. The rotational spectrum ofeach species in the ground state was measured in the microwave andmillimeter-submillimeter wavelength range using a waveguide Fourier transformspectrometer (8 - 17 GHz) and a source-modulated spectrometer employingbackward-wave oscillators (BWOs) (150 - 260 and 580 - 660 GHz). From thefitting procedure, accurate spectroscopic constants were derived for each ofthe species. These new sets of spectroscopic constants enable us to predictreliably the rotational spectrum (lines frequencies and intensities) in the4-1000 GHz frequency range and for J and Ka up to 80 and 31, respectively.Combined with IRAM 30 m antenna observations of Orion, this experimental studyallowed us to detect 15N substituted ethyl cyanide for the first time in Orion.The derived column density and rotational temperature are 10^13 cm-2 and 150 Kfor the plateau and 3 10^14 cm-2 and 300 K for the hot core. The deuteratedspecies were searched for but were not detected. The upper limit to the columndensity of each deuterated isotopologues was 10^14 cm-2.

Rotational spectrum of deuterated and 15N ethyl cyanides: CH3CHDCN and CH2DCH2CN and of CH3CH2C15N