RVESIM home page RVESIM is a program that simulates rovibronic spectra for diatomic molecules using spectroscopic constants. It produces simulations that can mimic spectra produced using an experimental apparatus -- that is, it can account for resolution, counting frequency, etc. Lines from other processes (atomic or molecular) can be included in the program, but cannot, at this time, be calculated within the program. The program is available free of charge for noncommercial uses.