Slade J., Igor V., Alex Z., Zeke I.

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Presentation transcript:

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

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

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

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

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

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

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.