Anthony Legon opened the discussion of the Introductory Lecture by Timothy Clark: In your lecture, you mentioned some ab initio calculations carried out on the weakly bound complex formed between argon and Br2, which you predict to have a T-shaped geometry with the Ar atom forming the stem of the T and the Br– Br as the bar. As far as I am aware, this complex has not been investigated experimentally but the analogous complex (Ar,Cl2) has. The rotational spectrum of (Ar, Cl2) was observed and analysed by the late Michael Gerry and co-workers 1 by using a pulsed-jet Fourier-transform microwave spectrometer. They determined the geometry to be that shown (to scale) in Fig. 1. They searched carefully for the spectrum of the linear isomer Ar/Cl–Cl but did not detect it. At the very


32 Figures and Tables

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