1. Slade J., Igor V., Alex Z., Zeke I.
Gold as a reference
Slade J., Igor V., Alex Z., Zeke I.

2. XPS of gold before (left) and after (right) Ar ion sputtering/cleaning

3. Ar sputtering clearly increases SEY of gold
The dose effect is still visible
SEY stabilizes at a maximum of 1.7

4. The SEY stabilizes after long exposure
Minimum Gun Emission
Maximum Gun Emission
The SEY stabilizes after long exposure
SEY varies by about 0.05 to 0.1 depending on electron gun energy and emission current

5. SEY is stable 1st scan is after Ar sputtering and 2 hrs e- exposure
12th scan is after 2.5 hours additional e- exposure
While the display showed 100eV gun energy, it’s apparent that it varies upon adjustment by ~10eV

6. Our results: ~650eV, 1.7 SEY
This is in reasonable agreement with others’ experiments and Zeke’s calculations.

7. Plans I have already tested a few samples (Al2O3 and MgO)
MgO is by far the more difficult sample to analyze due to either high SEY or sample charging
With this information on gold I will reanalyze the alumina and magnesium oxide data and present it next week
At very low primary electron current (0.3 μA) I may be able to gather better data from MgO, but it would be limited to 100eV primary electrons. This would decrease the dose effect and limit sample charging.