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Orion KL is one of the most frequently observed sources in the Galaxy, andthe site where many molecular species have been discovered for the first time.With the availability of powerful wideband backends, it is nowadays possible tocomplete spectral surveys in the entire mm-range to obtain a spectroscopicallyunbiased chemical picture of the region. In this paper we present a sensitivespectral survey of Orion KL, made with one of the 34m antennas of the MadridDeep Space Communications Complex in Robledo de Chavela, Spain. The spectralrange surveyed is from 41.5 to 50 GHz, with a frequency spacing of 180 kHz(equivalent to about 1.2 km/s, depending on the exact frequency). The rmsachieved ranges from 8 to 12 mK. The spectrum is dominated by the J=1-0 SiOmaser lines and by radio recombination lines (RRLs), which were detected up toDelta_n=11. Above a 3-sigma level, we identified 66 RRLs and 161 molecularlines corresponding to 39 isotopologues from 20 molecules; a total of 18 linesremain unidentified, two of them above a 5-sigma level. Results of radiativemodelling of the detected molecular lines (excluding masers) are presented. Atthis frequency range, this is the most sensitive survey and also the one withthe widest band. Although some complex molecules like CH_3CH_2CN and CH_2CHCNarise from the hot core, most of the detected molecules originate from the lowtemperature components in Orion KL.

A spectroscopic survey of Orion KL between 41.5 and 50 GHz