You may find it useful to add a Cokb emmision line (1.620794 A) to the 7 CoKa lines. Topas has a list of the CoKb lines. Using an instrument profile standard such as LaB6 or Si, refine the emmission line area while fixing the Lorentz half width to 0.6462 (value given for the CoKb emmission line). If your CoKa/Kb ratio is always constant for the instrument, you may fix the area, then save the new emmission profile for use in subsequent refinements. Note that the CoKb emmission line area is just another parameter to be added when creating an instrument profile function.
Dipo Omotoso -----Original Message----- From: Leandro Bravo [mailto:[EMAIL PROTECTED] Sent: Sat 5/26/2007 9:48 AM To: [email protected] Subject: Emission profile determination using the TOPAS software Hi all, again In al my refinements in TOPAS I use the emission profile present in the lam fold of TOPAS. The emission profile is CoKa7 (the D4 that we use, use a Co tube, radiation), but in our obtained DRX patterns the CoKb peaks appear and are becoming a problem in TOPAS, because it is affecting not only the qualification of the sample but also the Rwp values, etc. Checking the wavelenght section of EVA there are 4 possible wavelenghts using our equipment, CoKa1, Coka2, Coka3 and Cokb, these wavelenghts are given but checking the TOPAS I realized that only these values aren´t enough to determine a emission profile. My question is is there anyway that I could create a accurate emission profile that describe my equipment configuration?? Cheers, Leandro _________________________________________________________________ Verifique já a segurança do seu PC com o Verificador de Segurança do Windows Live OneCare! http://onecare.live.com/site/pt-br/default.htm
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