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Abstract. Absolute frequencies of hyperfine components of the 230.6nm (5s 2 i S o -5 S 5 p 3Pl°), I93.6nm (5s5p 3 p°-5 s 6 s 3S1) , 197.7nm (5s5p 3 p~-5 s 6 s 3S1) and 207.9 nm (5s 5p 3p°2-5s 6s 3S1) transitions in In II emitted from a hollow-cathode source have been measured using a high-resolution, scanning 6chelle monochromator. The measured frequencies of these four transitions have been used to determine the energies and hyperfine interaction constants of the 5s 5p 3po° , 3pl° , 3po and 5s 6s 3S 1 levels in In II. The hyperfine interaction constants for the dominant isotope l~SIn are found to be: 5s 5p 3po A=0.2322(2) cm -1, B = -0.0159(9) cm -1 5s5p 3pO A = 0.1699 (4) cm-1, B = 0.021 (6)cm -~ 5 s r s 3S 1 A=0.4022(4)cm -1, B = 0.002 (2)cm -1.The absolute frequency of the very narrow, strongly forbidden In II 236.5nm (5s 2 1So-5s5 p 3po°) transition, which has been proposed as a candidate for a new optical frequency standard, is found to be 42275.986(7)cm-1.

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