Re: [Ifeffit] Ca EXAFS with Ge220 or InSb111 (Lisa Bovenkamp)

2015-05-11 Thread Lisa Bovenkamp
Hello. No, the resolution is fine. I can do XANES fine with InSb111. We use those for years. Just had problems with EXAFS because for this long range the flux has to be more stable from the crystals. Lisa ___ Ifeffit mailing list

Re: [Ifeffit] Ca EXAFS with Ge220 or InSb111 (Lisa Bovenkamp)

2015-05-11 Thread Matt Newville
Hi Lisa, Just to second Matthew's suggestion, Si(111) should work fine for Ca K edge. In my experience, using high angle makes it much more challenging to keep a stable beam -- roll errors become more important, and thermal load can also be worse (power density on 1st crystal, heating from

Re: [Ifeffit] Ca EXAFS with Ge220 or InSb111 (Lisa Bovenkamp)

2015-05-11 Thread Robert Gordon
Another possibility is that the L-edges of In and Sb are giving considerable energy-dependence to the beam in the EXAFS region...any non-linearity between detectors will make extraction of the EXAFS problematic. Looking at CAMD's XAS beamline mono specs

Re: [Ifeffit] Ca EXAFS with Ge220 or InSb111 (Lisa Bovenkamp)

2015-05-11 Thread Matt Newville
Hi Robert, Lisa, On Mon, May 11, 2015 at 3:51 PM, Robert Gordon ragor...@alumni.sfu.ca wrote: Another possibility is that the L-edges of In and Sb are giving considerable energy-dependence to the beam in the EXAFS region...any non-linearity between detectors will make extraction of the