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We present a Radio Recombination Line (RRL) survey of the Galactic Plane fromthe HI Parkes All-sky Survey and associated Zone of Avoidance survey, whichmapped the region l=196degr -- 0degr --52degr and |b| < 5degr at 1.4 GHz and14.4 arcmin resolution. We combine three RRLs, H168$\alpha$, H167$\alpha$, andH166$\alpha$ to derive fully sampled maps of the diffuse ionized emission alongthe inner Galactic plane. The velocity information, at a resolution of 20 km/s,allows us to study the spatial distribution of the ionized gas and compare itwith that of the molecular gas, as traced by CO. The longitude-velocity diagramshows that the RRL emission is mostly associated with CO gas from the molecularring and is concentrated within the inner 30degr of longitude. A map of thefree-free emission in this region of the Galaxy is derived from theline-integrated RRL emission, assuming an electron temperature gradient withGalactocentric radius of $496\pm100$ K/kpc. Based on the thermal continuum mapwe extracted a catalogue of 317 compact (<15 arcmin) sources, with fluxdensities, sizes and velocities. We report the first RRL observations of thesouthern ionized lobe in the Galactic centre. The line profiles and velocitiessuggest that this degree-scale structure is in rotation. We also present newevidence of diffuse ionized gas in the 3-kpc arm. Helium and carbon RRLs aredetected in this survey. The He line is mostly observed towards HII regions,whereas the C line is also detected further away from the source of ionization.These data represent the first observations of diffuse C RRLs in the Galacticplane at a frequency of 1.4 GHz.

The HIPASS survey of the Galactic plane in Radio Recombination Lines