A time multiplex arrangement for presenting multiple samples to a single channel of NMR excitationdata acquisition includes means for rapid exchange of physical position between plural samples or sample portions from the measurement volume of the NMR instrument while said samples remain in a substantially the same homogeneous magnetic field. Another embodiment provides for the manufacture of 1,1,1,3,3-pentafluoropropane which comprises adding hydrogen fluoride to 1,1,1,3-tetrafluoropropene in the presence of an amine hydrofluoride complex and a metal catalyst. At least an insulation layer is formed on the substrate, wherein the insulation layer comprises at least a contact hole which exposes the silicon region. The structure ensures high performance and a long service life for the spark plug. The lens body carries an array of interior fluid-filled cells in which fluid is controllably moved by micropumps upon application of energy from an external source to move a fluid media into the cells to thereby alter the lens surface shape.