Auger alignment March 2013

data files in calibration/130318 auger align

Cu auger spectra distorted below 300 eV, all apertures open, 3 kV max @ 23 nA.

Record auger images # 3 2 mm aperture, lowest 3 kV mag. As sample is scanned around (large hole aperture plate) max disk shifts ~ 10% width, major shift if on slope in hole aperture.

• Image 0-2 2 kV CRR 5 gain 0.1
• image 2-3 15 deg tilt instead of 30
• image 4-5 flat, spot gets elongated as now 60 deg takeoff to analyzer
• image 6-7 30 deg tilt 1 kV gain .15
• image 8-9 600 eV
• image 10-11 octo correct 41.8, 46.5
• image 12-13 360 eV no correct gain .2
• image 14-15 octo 42, 46

try auger spectrum spot mode centered at 360 eV maxima with 42, 46 octo, totally distorted

when switching to spot mode counts change dramatically, unstable in time, less than in image mode. Something charging???

Try hard ground instead of SCM, no better.

Go back to reproduce original spectra, even stranger, shut down EIS.

Imaging gave strong hints, reduced area images shifted, depended on scan rates etc. Set sample stage flat, wiggle sample holder etc. Now seems better.

No more jumpy spectra, but still poor low KE performance. Charging or alignment??