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Methyl formate in its first torsionally excited state (vt=1 at 131 cm-1) isdetected for the first time toward W51 e2. All transitions from excited methylformate within the observed spectral range are actually detected (82transitions) and no strong lines are missing. The column density of the excitedstate is comparable to that of the ground state. For a source size of 7'' wefind that Trot = 104 +/- 14 K and N = 9.4 +4.0/-2.8 x 10^16 cm-2 for theexcited state and Trot = 176 +/- 24 K and N = 1.7 +.2/-.2 x 10^17 cm-2 for theground state. Lines from ethyl cyanide in its two first excited states (vt=1,torsion mode at 212 cm-1) and (vb=1, CCN in-plane bending mode at 206 cm-1) arealso present in the observed spectrum. However blending problems prevent aprecise estimate of its abundance. With regard to the number of lines ofexcited methyl formate and ethyl cyanide detected in W51 e2, it appears thatexcited states of large molecules certainly account for a large number ofunidentified lines in spectral survey of molecular clouds.

Detection of vibrationally excited methyl formate in W51 e2