IMPACT is a collision cross-section calculator that was designed for high performance, accuracy, precision, flexibility, and ease of use use. It calculates collision cross-sections at record speed using an octree-augmented projection approximation. Calibration entails accurate prediction of the Trajectory method, with a typical error of less than a per cent . IMPACT is run from the command line and currently takes pdb and xyz files as input and reports the cross section(s) to the standard output, or optionally to a user-specified file.
 Marklund et al., Collision Cross Sections for Structural Proteomics, Structure (2015)
16/01/2016: Due to problems with library dependencies, OpenMP parallelisation has been temporarily disabled for the OS X version of IMPACT. This makes no difference for the performance when IMPACT is run with default options, since it runs serially by default. If you have had problems running IMPACT on OS X, please try this new build.
20/04/2015: IMPACT version 0.9.1is released. This release introduces a few new options to facilitate communicating input and output data, and solves an issue with wildcard expansion on Windows. RELEASE NOTES
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