rir in MM3

[kelterer(-(at)-)fptchbds01.tu-graz.ac.at (M.Kelterer)]

 Dear Netters,
 I have some unclear results with MM4(94):
 By calculating a system with a 5-ring I received
 sometimes "restricted internal rotation (rir) frequencies"
 i.e. characterised lower than 40/cm. But I did no-restriced
 motion input. So, it's not clear for me what quality of this
 minimum is.
 Sometimes I got also "free internal rotation (fir) frequencies"
 i.e. 0/cm (this was after a calculation by dihedral driver option
 or from an stochastic search), and if I made little changes in one
 dihedral angle, this became a saddle point.
 But the restricted frequencies remained restricted ones.
 Can someone help me with experience or some papers?
 Dr. Kelterer anne-Marie
 Technical University Graz, Austria
 e-mail: kelterer(-(at)-)fptchbds01.tu-graz.ac.at