Methods, systems, and computer program products for screening transactions. In a vapor deposition apparatus, a run line for mixing one or more sources with a carrier gas and for supplying the resultant gas to a vapor deposition region; a vent line for allowing the sources to detour away from the vapor deposition region and exhausting the sources; and a mechanism for switching the paths of the sources from the vapor deposition region to the vent line are provided. As an example, Zn complexes that prove aggregation are provided. Furthermore, a substantially symmetrical streamlined dual-handle is ergonomically configured for a comfortable holding gesture. The scattered light 660 results from a part of a transmitted light 656 reflected by the metal foreign matter 720. The binding material includes at least one electronic memory medium integrated in the binding material.