SSRL Synchrotron XRay Absorption Spectroscopy Summer School 6

SSRL Synchrotron X-Ray Absorption Spectroscopy Summer School (6 th annual) June 28 - July 1, 2011 Intro to Sixpack, Background Subtraction John Bargar Senior Scientist June 30, 2011

Intro to Six. Pack 1. Install Six. Pack by extracting zip file 2. Start Six. Pack 3. Review All Modules 4. Sam. View basics • Opening data: SG 1 UC click on each file • Plotting data: plot options, zoom/unzoom, coordinates • Derivatives and E calibration • Applying E shifts to data BEWARE: ONLY THE FIRST SCAN COUNTS! • Save averages: mu. F, mu. T 1 • WHICH DATA SET SHOULD I USE, TRANS OR FLUO? • Best way to get data for plotting

Intro to Six. Pack 5. Open SG 1 UG files (leave other files there) 6. Group ave with mu. F 7. Delete SG 1 UC files 8. Save mu. F 9. Energy calibration – CAREFUL! 10. Save and Clear 11. Open EXP 08_6_1 EXT_EXAFS_002 files 12. Inspect and DT correct. 13. Save mu. F

Intro to Background Removal 1. Start a NEW sixpack session. 2. Background subtraction basics • Open files with. avg extensions • Plotting data: plot options, zoom/unzoom, coordinates • Derivatives and E calibration • Applying E shifts to data THIS IS THE SAFER WAY TO RECALIBRATE! • Where are the XANES? • Where are the EXAFS? • What is the best spline? • How to take the FT • Saving Data for XANES • Saving Data for EXAFS •