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Gold as a reference

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. Minimum Gun Emission. Maximum Gun Emission.

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Gold as a reference

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  1. 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. 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.

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