Re: Inst Parameters
>>each instrument should have his own optmized file Dear John I agree with Francesco. In particular the values of the parameters alp, bet_0 and bet_1 are related to the material and dimensions of the cryogenic moderators for the neutron source and should not be refined, while the sig_j and gam_j j=0,1,2 are related to your sample and must be refined. John, you should ask the local contact of the instrument the values of alp, bet, difC, difA and Zero parameters. However you can find some other parameter files for neutron powder diffraction (TOF) also in: http://www.isis.rl.ac.uk/crystallography/hrpd/ bye Stefano Quoting [EMAIL PROTECTED]: > > Dear John, > > I think that each instrument should have his own optmized file, due to its > profile function, but if you want to see some parameter files for neutron > powder diffraction from a pulsed source you can find them at > > http://www.isis.rl.ac.uk/crystallography/polaris/ > > Francesco > > > This message was sent using IMP, the Internet Messaging Program.
Inst Parameters
John, As was said by Francesco, you really must go back to the instrument responsible for the diffractometer you used to collect the data for that instrument parameter file. An old example of such a file is \gsas\example\inst_tof.prm (the instrument doesn't exist any longer), however iparm files for modern instruments are essentially the same. The principal difficulty will be in obtaining the proper values for those on the ICONS (DifC, etc.), ICOFF (incident spectrum) & PRFC (profile coefficients) records. Only the instrument responsible has those numbers. Bob Von Dreele R.B. Von Dreele IPNS Division Argonne National Laboratory Argonne, IL 60439-4814 -Original Message- From: john o callaghan [mailto:[EMAIL PROTECTED] Sent: Tuesday, July 26, 2005 8:49 AM To: rietveld_l@ill.fr Rietveld List, I have asked this before, but I'm asking again just by the off chance that I could find a solution. Can anyone help me with respect to an instrument parameter file that I can use with some neutron scattering data from a pulsed neutron source? Then problem is that I am unable to build such a file from scratch due to lack of experience and what not. Can anyone point me in the right direction?? With Regards, John O Callaghan
Re: Inst Parameters
> Dear John, I think that each instrument should have his own optmized file, due to its profile function, but if you want to see some parameter files for neutron powder diffraction from a pulsed source you can find them at http://www.isis.rl.ac.uk/crystallography/polaris/ Francesco
Inst Parameters
Rietveld List, I have asked this before, but I'm asking again just by the off chance that I could find a solution. Can anyone help me with respect to an instrument parameter file that I can use with some neutron scattering data from a pulsed neutron source? Then problem is that I am unable to build such a file from scratch due to lack of experience and what not. Can anyone point me in the right direction?? With Regards, John O Callaghan
