1. ICI PLC, Wilton Research Centre, Wilton, Redcar, Cleveland, TS10 4RF, UK (N.E.); National Starch and Chemical, 10 Finderne Avenue, Bridgewater, New Jersey (T.H.); and Central Laser Facility, CLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX1 0QX, UK (P.M., A.W.P., and M.T.)