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Dear ABINIT users:
I have been read the tutorial of abinit several times, but I have some 
questions about tutorial 1 and 2. firstly, In tutorial 2,acell is given 
through the convergence on the interatomic distance and atomisation energy. 
But I think this acell is very rough.. I want to known how to get accurate 
acell of hydrogen. Note, I find the “optcell” can’t be used to automaticly 
optimize the acell of hydrogen . Secondly, although we known the structure of 
hydrogen is hcp, it is treated as sc in tutorial 1 and 2 . I want to known 
how to judge which structure it is, it is hcp, sc or some structure else. Do 
you have any suggestion for these problems? Thanks in advance.
Zhenhua Zeng