Rmmf XPS Online Quiz
Please answer these questions related to XPS. Find out your score at the end. Only users who have completed this test with a satisfactory score may gain access to the XPS systems in the RMMF.
- 1.Most samples that have been exposed to the atmosphere will have a detectable quantity of adventitious carbon contamination. (Typically with a layer thickness of 1-2 nm). What is the binding energy of the C1s peak for this adventitious carbon?
- A.
284.8 eV
- B.
285 keV
- C.
292 eV
- D.
1220 eV
- 2.XPS is achieved by firing an X-ray beam at a sample, and then measuring the kinetic energy of the emitted electrons. How deep are these measured electrons coming from?
- A.
1 - 20 nm
- B.
1 - 20 microns
- C.
1 - 20 angstroms
- D.
1 - 20 mm
- 3.Which of the following peaks would represent Auger electron emission?
- A.
O KLL
- B.
Ba MNN
- C.
Ba 3d
- D.
O1s
- 4.What is the energy (in eV) of the aluminium K-alpha x-rays used for analysis in the Thermo K-Alpha XPS system used in the RMMF?
- 5.After excitation from the x-rays, photoemission occurs, ejecting electrons from the sample with a variety of energies (forming an XPS spectrum). What energy of the electrons is being directly measured by the spectrometer?
- A.
Kinetic energy
- B.
Binding energy
- C.
Thermal energy
- 6.XPS is a good technique for measuring the atomic concentration of a bulk sample
- A.
True
- B.
False
- 7.What possible methods could be used to improve the signal/noise ratio of your XPS spectrum?
- A.
Take more scans
- B.
Increase scan dwell time
- C.
Increase the pass energy
- D.
Increase the spot size
- E.
All of the above
- 8.A typical XPS system operates in ultra high vacuum conditions ((UHV; P < 10−9 millibar)) Which of these samples are NOT suitable for XPS analysis at UHV?
- A.
A piece of rock with many pores
- B.
A thin continuous metal film
- C.
A sample which contains water
- D.
A sample which outgasses in UHV
- E.
A solid polymer which is stable under x-rays in UHV
- F.
A monomer sample
- G.
Nanoparticles on a conductive substrate
- H.
A non-conductive sample
- 9.A well resolved Si2p spectrum of pure silicon has two peaks. Why is this?
- A.
Each peak represents a chemical state, and it has two chemical states
- B.
Each peak represents an electron with a different angular momentum from the 2p subshell.
- C.
There is overlap with the adventitious carbon peak which is present with ALL samples.
- D.
The sample drifted during analysis
Questions: 13 | Attempts: 4616 | Last updated: Mar 22, 2022
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