Abstract
We have used the SEST 15-metre and Onsala 20-metre telescopes to perform deep (rms> 30 mJy) integrations of various molecular rotational transitions towards damped Lyman-alpha absorption systems (DLAs) known to occult millimetre- loud quasars. We have observed 6 new systems and improved the existing limits for 11 transitions. These limits may be ap- proaching the sensitivities required to detect new systems and we present a small number of candidate systems which we believe warrant further observation.
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