Abstract: Target mounting apparatus for use in a conventional physical vapor deposition system includes a target assembly, a source mounting plate, means for removably mounting the target assembly on the source mounting plate, and a keying system for preventing mounting of a target assembly which is incompatible with the deposition process intended to be carried out. The keying system includes a male portion formed on either the target assembly or the source mounting plate, and a female portion formed on the other of the target assembly and the source mounting plate. Keying of the target assembly to the source mounting plate is achieved by either forming the male and female portions with unique, mating cross sectional shapes, or by varying the spatial orientation or alignment of the male and female portions. In an alternate embodiment, a key pin is positionable in any of a plurality of positions on the source mounting plate, respectively corresponding to differing target assemblies.

Abstract: Novel products are prepared from Aroid corms by first peeling and washing the corms and then cutting the corms into pieces. Aqueous alkali is applied to the corms to remove acid principles and then the corms are treated with aqueous hydrogen peroxide to prevent discoloration. The so-treated corms are washed with water until they are neutral and then dried.