Gobbel Mirror

[eli lancry]

Dear Rietvelders, I am working with few molybdenum chalcogenides (hexagonal) and I have noticed that when I measure it (micronic powder in a flat sample holder) in Bruker D8 (Bragg Brentano) with Gobbel mirror, the major peak at around 13 2Th is twice intense of doing the same measurement in Bruker D8 without Gobbel mirror while the rest of the pattern is the same. the refinement (fullprof) is much better for the sample measured with the mirror. my questions is: 1. what could be the reasons for this difference? (absorption??) 2. how can I overcome this problem? (sample preparation, refinement)   Thanks in advance for your help   Eli Lancry Chemistry department Bar-Ilan University, Ramat Gan ISRAEL Phone: 972-(0)3-5317665/8169 Mobile: 972-(0)54-2212717 Fax: 972-(0)3-5351250 E-mail: [EMAIL PROTECTED]