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We performed the first spectral-line survey at 82--106 GHz and 335--355 GHztoward the outflow-shocked region, OMC 2-FIR 4, the outflow driving source, FIR3, and the northern outflow lobe, FIR 3N. We detected 120 lines of 20 molecularspecies. The line profiles are found to be classifiable into two types: one isa single Gaussian component with a narrow ($<$ 3 km s$^{-1}$) width and anotheris two Gaussian components with narrow and wide ($>$ 3km s$^{-1}$) widths. Thenarrow components for the most of the lines are detected at all positions,suggesting that they trace the ambient dense gas. For CO, CS, HCN, andHCO$^{+}$, the wide components are detected at all positions, suggesting theoutflow origin. The wide components of C$^{34}$S, SO, SiO, H$^{13}$CN,HC$^{15}$N, H$_2^{13}$CO, H$_2$CS, HC$_3$N, and CH$_3$OH are detected only atFIR 4, suggesting the outflow-shocked gas origin. The rotation diagram analysisrevealed that the narrow components of C$_2$H and H$^{13}$CO$^+$ show lowtemperatures of 12.5$\pm$1.4 K, while the wide components show hightemperatures of 20--70 K. This supports our interpretation that the widecomponents trace the outflow and/or outflow-shocked gas. We compared observedmolecular abundances relative to H$^{13}$CO$^+$ with those of theoutflow-shocked region, L1157 B1, and the hot corino, IRAS 16293-2422. Althoughwe cannot exclude a possibility that the chemical enrichment in FIR 4 is causedby the hot core chemistry, the chemical compositions in FIR 4 are more similarto those in L1157 B1 than those in IRAS 16293-2422.

Spectral-Line Survey at Millimeter and Submillimeter Wavelengths toward an Outflow-Shocked Region, OMC 2-FIR 4