NATIONAL LABORATOR Los Alamos National Laboratory, an affirmative action/equalopportunityemployer, is operated by the Universityof California for the U.S. Department of Energy under contractW-7405-ENG-36. By acceptanceof this'article,the publisherrecognizes that the U.S. Government retains a nonexclusive,royalty-freelicenseto publishor reproducethe publishedform of this contribution,or to allowothers to do so, for U.S. Governmentpurposes. The Los Alamos NationalLaboratory requests that the publisheridentifythis articleas work performed under the auspicesof the U.S. Departmentof Energy. FormNo. 836R5 ST262910/91 o I J RECENT DEVELOPMENTS IN ZINC OXIDE TARGET CHEMISTRY