Of course you can.
There is an option "fix specific reciprocal metric tensor elements" - that's 
what you need. 
It is located in "least-squares refinement set-up/overall parameters/lattice 
parameters" in GSAS menu.

It seems that it is not accessible via EXPGUI interface.

Sincerely,
Maxim.



-----Original Message-----
From: prasu...@veccal.ernet.in [mailto:prasu...@veccal.ernet.in] 
Sent: Monday, September 14, 2009 4:45 PM
To: Rietveld Method; Robert Von Dreele (vondreel)
Subject: refining the structural parameters selectively

Dear all,
          Using triclinic structure(P1) in GSAS, how can i refine the lattice 
parameters only and make the angles fixed? In the phase tab, i am getting only 
the refine cell option, which refines a,b,c,alpha,beta,gamma alltogether. Is 
there any technique to refine only one or a fiew of them selectively? Thanking 
you,

With regards,
Prasun Sharma Chowdhury
SRF, VECC
Kolkata - 700064
West Bengal
India

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