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Spectroscopy of redshifted radio absorption of atomic and molecular speciesprovide excellent probes of the cold component of the gas in the early Universewhich can be used to address many important issues, such as measuring baryoniccontent, probing large-scale structure and galaxy evolution, as well asobtaining independent measurements of various combinations of fundamentalconstants at large look-back times. However, such systems are currently veryrare with only 80 detected in HI 21-cm and five in OH and millimetre-bandspecies. Here we summarise the main selection criteria responsible for this andhow the next generation of radio telescopes are expected to circumvent thesethrough their wide instantaneous bandwidths and fields-of-view.

Blind Wide Area Surveys: Where will we find redshifted atomic and molecular absorption?