Tommet T N, Olszewski G B, Chadwick P A, Bernasek S L
Department of Chemistry, Princeton University, Princeton, New Jersey 08540, USA.
Rev Sci Instrum. 1979 Feb;50(2):147. doi: 10.1063/1.1135796.
Low-energy electron diffraction (LEED) has great need for a quick and efficient means of making intensity measurements (e.g., in studying reactive surfaces which quickly degrade, and in handling the enormous amounts of data needed for data averaging). The photographic-vidicon camera method fills this need. This paper describes a system and procedure for this method. We have pointed out advantages of this method over other methods of LEED intensity data collection and analysis, and have included comments on the advantages of our experimental system over other systems using this method. General properties of the photographic and vicdicon system are analyzed as well as specific tests done on the method. Estimates of probable error in spot intensity measurements due to numerous effects have been analyzed and I-V curves reduced from raw photographic data are compared. It is hoped that the description, comments, and analysis will facilitate the incorporation of the photographic-vidicon method of LEED analysis into research programs.
