Ballistic Regime

Bready

I'm currently doing an undergraduate project on Brownian Motion and was told a phenomenon know as ballistic regime (at least I think that's what it's called) could have an effect on my results. My experiment involves analysing tiny beads in liquids undergoing Brownian motion and using them to determine the liquids viscosities.

Ballistic Regime involves something about particles already having a particular velocity before you start measuring them. When you start recording the bead movements they have a 'memory' from previous collisions meaning the start of the recording cannot be used as data. However, I haven't been able to find any literature on the subject - I was wondering if I'm even using the right terminology (ie ballistic regime) for this phenomenon and if anyone knows of any books/papers on the subject.

Thanks very much.