这是LJ Potential吗？

/* ******** ParticleInteractionForce *********************************** */

// This is the most crucial part of this code: it defines the pair-wise interaction force
// between particles. This is a data processor: it executes algorithm for pair-wise
// interaction on a specific sub-domain of the simulation, defined by the parameter
// “domain”.

我没有了解过LJ Potential，什么是rCritical和forceAmplitude呢？