Abstract
This paper presents the Vienna ab initio simulation package (VASP) data viewer, a desktop 3D visualization application for the analysis of valence electronic structure information derived from first-principles quantum-mechanical density functional calculations. This tool allows a scientist to directly view and manipulate the calculated charge density or electron localization function (ELF) from an electronic structure calculation, providing insight into the nature of chemical bonding. Particular attention was given to the design and implementation of the user interface (UI) for the data viewer. It provides for expert and novice usage, and both natural direct manipulation and precise numerical control. The data viewer has proven useful to chemical scientists for understanding the results of electronic structure calculations.
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