Context: .Unbiased molecular line surveys are a powerful tool for analyzing the physical and chemical parameters of astronomical objects and are the only means for obtaining a complete view of the molecular inventory for a given source. The present work stands for the first such investigation of a photon-dominated region.
Aims: .The first results of an ongoing millimeter-wave survey obtained towards the Orion Bar are reported.
Methods: .The APEX telescope in combination with the APEX-2A facility receiver was employed in this investigation.
Results: .We derived the physical parameters of the gas through LVG analyses of the methanol and formaldehyde data. Information on the sulfur and deuterium chemistry of photon-dominated regions is obtained from detections of several sulfur-bearing molecules and DCN.