RE: confusion about some GSAS parameters

2008-08-07 Thread Kurt Leinenweber
To: [EMAIL PROTECTED] Cc: rietveld_l@ill.fr Subject: Re: confusion about some GSAS parameters On Aug 7, 2008, at 12:02 PM, [EMAIL PROTECTED] wrote: So, for the case of a brag brenteno diffractometer without any monochromator, will the value for POLA should be fixed to zero

Re: confusion about some GSAS parameters

2008-08-07 Thread Brian H. Toby
On Aug 7, 2008, at 12:02 PM, [EMAIL PROTECTED] wrote: So, for the case of a brag brenteno diffractometer without any monochromator, will the value for POLA should be fixed to zero?? There are two GSAS polarization models (read the manual!), but my recollection is that for IPOLA=0, P

Re: Re: confusion about some GSAS parameters

2008-08-07 Thread prasunsc
Dear all, So, for the case of a brag brenteno diffractometer without any monochromator, will the value for POLA should be fixed to zero?? Another problem is that, negative value is coming in trns when i am refining it. is it physically acceptable?

Re: confusion about some GSAS parameters

2008-08-07 Thread [EMAIL PROTECTED]
-augsburg.de/exp5 - Original Message - From: "Robert Von Dreele" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Thursday, August 07, 2008 6:08 PM Subject: Re: confusion about some GSAS parameters > Hi, > The other note on this is not quite

Re: confusion about some GSAS parameters

2008-08-07 Thread [EMAIL PROTECTED]
Hi, friend, Following are my opinions due to my experience, responding to your questions: 1, In principle, POLA should not be refined. To get sensible value of POLA, please just simply consult the technique support of your instrument or ask colleagues who use radiation tubes of the same type.