Reports new high-resolution measurements of the photoabsorption spectrum of C₂H₅I, in which prominent autoionising resonances have been observed. The spectrum is similar in some respects to the reported spectrum of CH₃I (Baig et al., 1981). Rydberg series are found to the ²E limits, arising from excitation of a lone-pair pi orbital. The authors have performed a graphical Lu-Fano analysis of the series converging to ²E_3/2 by comparison with Xe I and CH₃I. The authors are able to extract from their data a quasi-atomic ordering of Rydberg excitations. Above the ²E_3/2 threshold, the authors have applied the Dubau-Seaton formula to interpret the spectrum, and they can tentatively ascribe most of the observed width to autoionisation.