
<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial"><DIV style="LINE-HEIGHT: 1.7; FONT-FAMILY: arial; COLOR: #000000; FONT-SIZE: 14px">

<DIV>Dear colleaguesгм</DIV>

<DIV>     The Al.laz file in McStas\lib\data shows that structure factor |F(HKL)| of Al is as following (part of the data):</DIV>

<DIV>                                 (111)                            1.3</DIV>

<DIV>                                                    бн</DIV>

<DIV>                                 (220)                            1.2</DIV>

<DIV>                                                    бн</DIV>

<DIV>     However, according to the formula <SPAN style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN style="POSITION: relative; TOP: 16pt; mso-text-raise: -16.0pt"><v:shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"> <IMG src="cid:1079d1c9$1$13d23a1ece3$Coremail$wokaoyan1981$126.com" orgWidth="505" orgHeight="82"></v:shapetype></SPAN></SPAN><SPAN style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN style="POSITION: relative; TOP: 16pt; mso-text-raise: -16.0pt"><v:shapetype stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600">we calculate that <FONT face="Arial">|F(HKL)|  of Al for all diffraction planes is 13.8.Besides, we find that |F(HKL)| s of other materials we calculated are quite different from the ones of McStas.</FONT></v:shapetype></SPAN></SPAN></DIV>

<DIV><SPAN style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN style="POSITION: relative; TOP: 16pt; mso-text-raise: -16.0pt"><v:shapetype stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><FONT face="Arial"></FONT></v:shapetype></SPAN></SPAN> </DIV>

<DIV><SPAN style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><SPAN style="POSITION: relative; TOP: 16pt; mso-text-raise: -16.0pt"><v:shapetype stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><FONT face="Arial"></FONT></v:shapetype></SPAN>      My question is what is the formula used in the McStas laz files to calculate <FONT face="Arial">|F(HKL)|  and why is the difference.</FONT></SPAN></DIV>

<DIV><SPAN style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT face="Arial">      I'm looking forwad your replys.</FONT></SPAN></DIV>

<DIV><SPAN style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT face="Arial"></FONT></SPAN> </DIV>

<DIV><SPAN style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT face="Arial">Best regards,</FONT></SPAN></DIV>

<DIV><SPAN style="FONT-FAMILY: 'Times New Roman'; FONT-SIZE: 12pt; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT face="Arial">Tom</FONT></SPAN></DIV></DIV></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span>