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yufenfei3002金蟲 (小有名氣)
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[求助]
GSAS中Polarization Fraction的意義是什么?
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在看Lachlan Cranswick 和 Ian Swainson寫的GSAS的教程,里面有一段話看不懂,求高手指點! 在創(chuàng)建GSAS Instrument Parameter file的時候(Powder -- Instedit -- Polarization Fraction) 具體見附件。 附件中的這段話看不明白,求指點。 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 – e.g., 5 to 150 degrees 2-theta). |

木蟲 (正式寫手)
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