NONADIABATIC PROCESSES IN H$^-$ + H$_2$ COLLISIONS
           A. K. Belyaev and A. S. Tiukanov

Department of Theoretical Physics, Pedagogical University of Russia, 
St. Petersburg, Russia

Potential energy surfaces and nonadiabatic couplings between 
the low-lying singlet states of H$_3^-$ are calculated by means of the
diatomics-in-molecule method. The nonadiabatic regions are specified in
the three-dimensional space, and it is shown that the nonadiabatic
couplings influence remarkably the dynamics of all processes in H$^-$ +
H$_2$ collisions. In particular, it is found the simultaneously
intersecting four seams of conical intersection.