The Ag II spectrum emitted from hollow cathode discharges has been recorded in the region 940^8500 Ð with Fourier transform and high dispersion photographic instruments. 311 lines have been classi¢ed and measured at high accuracy (AE0.03^0.003 cm À1 above 2000 Ð, AE0.002^0.0005 Ð in the VUV region). Improved energy level values have been derived from the lines, and 24 new odd levels have been found. The level structure has been interpreted by ab initio and parametric calculations.

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We have determined lifetimes of the 12 4d95p fine-structure levels of AgII, using the beam-foil excitation method. The results are compared with various theoretical predictions. Fairly good agreement is found with recent superposition-of-configurations (SOC) calculations which have included relativistic corrections. r] Ld8 5s2Ld9 5p

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