Transparency of the sample causes negative shift of the high angle peaks. The sign of the transparency coefficient in GSAS depends how the formula for error is written (Is the error added or subtracted from calc. angle) but it should be always negative or always positive. How it is realized in GSAS can be found in the bible (GSAS Manual.pdf) that has explanation for everything. Peter Zavalij
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Wednesday, April 07, 2004 12:53 AM To: [EMAIL PROTECTED] Dear All rietvalders, a question about sample transparency in GSAS is asked. is there any physical meaning when its value is positive or negative? Is the sample density correlated somehow with it? since my sample becomes less dense and the neg. trns value was obtained. Hope that it won't be too silly to ask. Thank you for your advice stephen
