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Using new J-band VLT-ISAAC and Keck-NIRSPEC spectroscopy, we have measuredHalpha and [NII] line fluxes for 0.47<z<0.92 CFRS galaxies which have [OII],Hbeta and [OIII]a line fluxes available from optical spectroscopy, toinvestigate how the properties of the star forming gas in galaxies evolve withredshift. We derive the extinction and oxygen abundances for the sample using amethod based on a set of ionisation parameter and oxygen abundance diagnostics,simultaneously fitting the [OII], Hbeta,[OIII], Halpha, and [NII] line fluxes.The individual reddening measurements allow us to accurately correct theHalpha-based star formation rate (SFR) estimates for extinction. Our mostsalient conclusions are: a) in all 30 CFRS galaxies the source of gasionisation is not due to AGN activity; b) we find a range of 0<AV<3, suggestingthat it is important to determine the extinction for every single galaxy inorder to reliably measure SFRs and oxygen abundances in high redshift galaxies;c) high values of [NII]/Halpha >0.1 for most (but not all) of the CFRS galaxiesindicate that they lie on the high-metallicity branch of the R23 calibration;d) about one third of the 0.47<z<0.92 CFRS galaxies in our sample have lowermetallicities than local galaxies with similar luminosities and star formationrates; e) comparison with a chemical evolution model indicates that these lowmetallicity galaxies are unlikely to be the progenitors of metal-poor dwarfgalaxies at z~0.Comment: Accepted for publication in the Astrophysical Journa

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