The solvers in SSUMES program package only solves the master-equation, and the necessary informations, density of states and microscopic rate constants must be prepared by other programs.   The program rrkmth which is the modified version of RRKM program in the UNIMOL suite does prepare these informations, and the SSUMES components accepts the file generated by rrkmth as is, or with only minor modifications.

  The input file for rrkmth is originally intended to be prepared manually by using text editors.   However, the preparation of the RRKM input is a bit complicated and it is not easy to add or delete new channels for dissociation and isomerization.   For this purpose, prepum program in GPOP can be used to prepare the RRKM input from the output of Gaussian.   The GPOP suite can also be useful to calculate the TST (high-pressure limiting) rate constants and equilibrium constants needed to transform the results of SSUMES.   At the beginning, the relations between these programs looks complicated, but they are arranged and separated into reasonable units.   The relations between program units are schematically shown below.