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Pure single crystals of barium titanate have been synthesized and the structure refined using the atomic coordinates of Burbank & Evans [Acta Cryst. (1948), 1, 330-336]. The short Ti--Ti distance in the face-sharing Ti209 group was determined to be 2.690 (4) A, which is significantly shorter than in other barium titanate compounds.

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Hyperfine structure of the zSl,z-2Pl,, transition of Hg II (R=194.2 nm).The hyperfine structure of the 194.2 nm line of HgII has been studied by Fabry-Perot interferometry. The A-factors for the odd isotopes have been determined for the levels 2Sl/z and *P1,, and the shifts for the different isotopes in the natural mercury line have been measured. RCsum6Structure hyperfine de la transition 2Sli2-zPl,, de Hg II (A= 194,2 nm).La structure hyperfine de la raie 194,2 nm de Hg I1 a et6 Ctudite par spectrometric Fabry-Ptrot. Les facteurs de structure hyperfine A ont et6 determines pour les isotopes impairs. Les deplacements isotopiques dans la raie du mercure naturel ont et6 mesures.