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GSASÖÐPolarization FractionµÄÒâÒåÊÇʲô£¿
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ÔÚ¿´Lachlan Cranswick ºÍ Ian SwainsonдµÄGSASµÄ½Ì³Ì£¬ÀïÃæÓÐÒ»¶Î»°¿´²»¶®£¬Çó¸ßÊÖÖ¸µã£¡ ÔÚ´´½¨GSAS Instrument Parameter fileµÄʱºò£¨Powder -- Instedit -- Polarization Fraction£© ¾ßÌå¼û¸½¼þ¡£ ¸½¼þÖеÄÕâ¶Î»°¿´²»Ã÷°×£¬ÇóÖ¸µã¡£ A POLA value of 0.911. ( IPOLA should be set to 1 which defines the use of the Azaroff function, but currently there is not an option to do this in the Instedit screen, so it needs to be set in the EXP file during refinement). Paraphrasing a note from Bob von Dreele, ¡°IPOLA=1 is in there to match the "traditional" Azaroff function for diffracted beam monochromators. The IPOLA=0 function is my adaption so that POLA is the polarized fraction. POLA=0.50 for no polarization and POLA=1.0 for perfect polarization nearly realized in synchrotron radiation & vertical diffraction.¡±. Polarization fraction can be calculated, but it can be good to determine this experimentally by running a suitable phase such as cubic Y2O3 from the lowest to highest angle of the diffractometer ¨C e.g., 5 to 150 degrees 2-theta). |
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2013-05-06 22:08:20, 207.19 K
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