Auger Problem Deflection

Several problems

• absolute count rate drops
• low KE auger really bad
• Octopole does not have normal effect on counts
• low mag image of #3 aperture offset
• switch back to Cu110 sample, not normal

Deflection voltages

• Xa+ is bad, stuck at -5.5 V from 20 to 100% (load or no load). 10% -1.16, 5% -0.3, 0% +6.8
• Xa- tracks, opposite of Xa+
• Ya+, 0% -1, 10% -.8, 20% to 100% -.4
• Ya- tracks Ya+
• B X&Y stuck at zero independent of control settings.

Ground all 8 electrodes to 'system ground'

Cu110 CRR5 3 kV max, low KE distorted

More or less normal spectra at high KV

Good Cu110 spectrum recorded when quadrupole worked, 30 tilt

Now try to cycle power on PC and EAC

While power is off, remove and physically inspect EAC deflection boards. No visible damage. These seem pure analog, GPIB decode and voltage generation elsewhere? +/- pairs seem to be on deflection boards (op amp circuits)

• Before EIS starts, voltage (disconnected from analyzer) at -40 V on XA+
• Voltages different from before but still bad, should be -40 to + 40 V for 0-100%
• Xa+  0% 7.2, 10% -7.2, 20% and above -15.9; Xa- is opposite
• Ya+ 0% 0 10% -.8, 20% and above -0.4; Ya- tracks
• XY b zero always

Now try ISEM. Do EA SEM image manual deflection, X and Y 25%, values go to -20.0 V for Xa+, Ya+. What does this mean?

Now EIS Octopole control works!!!

Optimize at 80 V, spectrum normal above 135, drops off quickly below that. Nothing below 60 V. Better but still different from before.

residual B field from lens after higher KV operation???

Something charging near sample???

Better with octopole, but problems below 135 eV