Rmmf XPS Online Quiz

10 Questions | Total Attempts: 104

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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.


Questions and Answers
  • 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

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