ARTHUR BROWN (AST, AEROSPACE METALLIC MATERIALS) LOADS A CERAMIC COATED SILICON WAFER INTO A KRATOS (ELECTRON SPECTROSCOPY FOR CHEMICAL ANALYSIS) TO PERFORM X-RAY PHOTOELECTRON SPECTROSCOPY (XPS). XPS IS A TECHNIQUE THAT ANALYZES THE SURFACE CHEMISTRY OF A SAMPLE BY IRRADIATING IT WITH X-RAYS AND MEASURING THE NUMBER AND KINETIC ENERGY OF ELECTRON THAT ESCAPE.

20th Anniversary of the First Lunar Landing Colloquium held at Langley. William H. Michael Jr. (center) reviews the evolution of his parking orbit concept with Clinton E. Brown (right) head of the Lunar Exploration Working Group and Arthur Vogeley (left) mastermind of Langley's rendezvous and docking simulators of the 1960's.