小中大cuturl('https://www.google.ch/?gfe_rd=cr&ei=s2txVpjvDoXF8AfwyorQAg&gws_rd=ssl#q=gsas') quantitative phase analysis
cuturl('http://www.ccp14.ac.uk/solution/gsas/files/expgui_quant_gualtieri.pdf')
wi = (scale factor * unit cell mass * unit cell volume)i / sum(scale factor * unit cell mass * unit cell volume)
unit cell mass = number of atom in unit cell * atomic mass/avogadro number = ? (g)
精修后的scale factor 决定了质量百分比。
