An apparatus for decomposing a target substance, which is a halogenated aliphatic hydrocarbon compound or a halogenated aromatic compound. The dispensing nozzle is a snap-together combination of a unitary, molded plastic nozzle body and a unitary, molded plastic outlet member. The apparatus is also configured such that the content on the second display in the covered region can be viewed through the first display. During and subsequent to deposition, dopant atoms diffuse into the deposited semiconductor, forming a thin heavily doped region and making a good ohmic contact between the semiconductor material and the underlying conductive layer. The process is particularly suitable for destabilizing and purifying styrene which has been stabilized with 4-tert-butylcatechol for transportation. This final hem tool has a generally planar section overlying the outer edge of the inner panel and a portion of the lip following a prehem operation.