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Source confusion defines a practical depth to which to take large-areaextragalactic surveys. 3D imaging spectrometers with positional as well asspectral information, however, potentially provide a means by which to use lineemission to break the traditional confusion limit. In this paper we present theresults of our investigation into the effectiveness of mid/far infrared,wide-area spectroscopic surveys in breaking the confusion limit. We use SAFARI,a FIR imaging Fourier Transform Spectrometer concept for the proposed JAXA-ledSPICA mission, as a test case. We generate artificial skies representative of100 SAFARI footprints and use a fully-automated redshift determination methodto retrieve redshifts for both spatially and spectrally confused sources forbright-end and burst mode galaxy evolution models. We find we are able toretrieve accurate redshifts for 38/54% of the brightest spectrally confusedsources, with continuum fluxes as much as an order of magnitude below the 120$\mu$m photometric confusion limit. In addition we also recover accurateredshifts for 38/29% of the second brightest spectrally confused sources. Ourresults suggest that deep, spectral line surveys with SAFARI can break thetraditional photometric confusion limit, and will also not only resolve, butprovide redshifts for, a large number of previously inaccessible galaxies. Toconclude we discuss some of the limitations of the technique, as well asfurther work.

The Effectiveness of Mid IR / Far IR Blind, Wide Area, Spectral Surveys in Breaking the Confusion Limit