BmBt matrix

[acapobia]

Hi all

I would like to know how the BmB^t matrix is defined in TURBOMOLE. More in detail:

1) is  BmB^t  in a way related to the B matrix by Wilson, namely:
B_aj = dS_a/dx_j|₀ where 0 means current geometry, S_a is the a-th internal coordinate (a=1,..., 3N-6, N is the total number of atoms of a non-linear molecule) and j (j=1,..., 3N) the j-th Cartesian (possibly a displacement one, but that is of course immaterial) coordinate?

2) Is there a way to get the full  BmB^t matrix (or, even better, the B matrix, if TM uses that matrix) from TURBOMOLE, once a set of non-redundant internals have been defined, eg by using the iaut command?

Thank you in advance for your support.

Amedeo