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Sub-Doppler degenerate four-wave mixing (DFWM) spectroscopy has been performed on carbon disulfide (CS 2 ) molecules entrained in a pulsed slit-jet expansion of modest dimensions (i.e. 1 cm slit length). Data obtained for the 10V band in the V 1 B 2 ( 1 Δ u )←X 1+g (π * ← π) absorption system ( 323.7 nm) demonstrate significant enhancements in sensitivity and resolution over that obtained through use of a conventional free-jet source based upon a circular nozzle orifice. These observations are quantified and interpreted in terms of the increase in effective sample interaction length that accompanies collapse of the transverse velocity distribution in a slit-jet expansion.