Rmmf XPS Online Quiz

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Matthew
M
Matthew
Community Contributor
Quizzes Created: 1 | Total Attempts: 312
| Attempts: 312
SettingsSettings
Please wait...
  • 1/10 Questions

    What possible methods could be used to improve the signal/noise ratio of your XPS spectrum?

    • Take more scans
    • Increase scan dwell time
    • Increase the pass energy
    • Increase the spot size
    • All of the above
Please wait...
About This 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.

Rmmf XPS Online Quiz - Quiz

Quiz Preview

  • 2. 

    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?

    • Kinetic energy

    • Binding energy

    • Thermal energy

    Correct Answer
    A. Kinetic energy
    Explanation
    The spectrometer directly measures the kinetic energy of the electrons that are ejected from the sample after being excited by x-rays. This is because the kinetic energy of the electrons is directly related to their velocity and can be measured by analyzing their motion in the spectrometer. Binding energy refers to the energy required to remove an electron from an atom, while thermal energy is the energy associated with the random motion of particles in a sample.

    Rate this question:

  • 3. 

    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?

    • 284.8 eV

    • 285 keV

    • 292 eV

    • 1220 eV

    Correct Answer
    A. 284.8 eV
    Explanation
    Visit https://xpssimplified.com/ for binding energies of subshell electrons.

    Rate this question:

  • 4. 

    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?

    • 1 - 20 nm

    • 1 - 20 microns

    • 1 - 20 angstroms

    • 1 - 20 mm

    Correct Answer
    A. 1 - 20 nm
    Explanation
    Though the X-rays penetrate quite deep, it is the near surface electrons which have enough kinetic energy to get to the detector which are analysed in XPS.

    Rate this question:

  • 5. 

    A well resolved Si2p spectrum of pure silicon has two peaks. Why is this?

    • Each peak represents a chemical state, and it has two chemical states

    • Each peak represents an electron with a different angular momentum from the 2p subshell.

    • There is overlap with the adventitious carbon peak which is present with ALL samples.

    • The sample drifted during analysis

    Correct Answer
    A. Each peak represents an electron with a different angular momentum from the 2p subshell.
  • 6. 

    XPS is a good technique for measuring the atomic concentration of a bulk sample

    • True

    • False

    Correct Answer
    A. False
    Explanation
    XPS, or X-ray photoelectron spectroscopy, is not a suitable technique for measuring the atomic concentration of a bulk sample. XPS is primarily used to analyze the surface composition and chemical state of materials. It provides information about the elements present on the surface and their chemical bonding, but it does not provide quantitative measurements of atomic concentration throughout the bulk of a sample. Other techniques, such as Auger electron spectroscopy or energy-dispersive X-ray spectroscopy, are better suited for determining atomic concentration in bulk samples.

    Rate this question:

  • 7. 

    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?

    Correct Answer
    1486.7, 1486.7eV, 1486.7 eV
    Explanation
    The energy of the aluminium K-alpha x-rays used for analysis in the Thermo K-Alpha XPS system used in the RMMF is 1486.7 eV.

    Rate this question:

  • 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 piece of rock with many pores

    • A thin continuous metal film

    • A sample which contains water

    • A sample which outgasses in UHV

    • A solid polymer which is stable under x-rays in UHV

    • A monomer sample

    • Nanoparticles on a conductive substrate

    • A non-conductive sample

    Correct Answer(s)
    A. A piece of rock with many pores
    A. A sample which contains water
    A. A sample which outgasses in UHV
    A. A monomer sample
    Explanation
    XPS analysis requires ultra high vacuum conditions, which means that any sample that can release gas or contain moisture is not suitable for analysis. A piece of rock with many pores can release gas, a sample containing water can introduce moisture, a sample that outgasses in UHV can release gas, and a monomer sample can also release gas. Therefore, these samples are not suitable for XPS analysis at UHV.

    Rate this question:

  • 9. 

    Which of the following peaks would represent Auger electron emission?

    • O KLL

    • Ba MNN

    • Ba 3d

    • O1s

    Correct Answer(s)
    A. O KLL
    A. Ba MNN
    Explanation
    Auger electron emission occurs when an electron from a higher energy level fills the hole left by an ejected core electron, resulting in the emission of an Auger electron. In this case, both O KLL and Ba MNN represent core-level electron transitions, where an electron from a higher energy level fills a core-level hole. Therefore, both O KLL and Ba MNN peaks could potentially represent Auger electron emission. The other options, Ba 3d and O1s, do not involve core-level electron transitions and are not relevant to Auger electron emission.

    Rate this question:

Quiz Review Timeline (Updated): Mar 22, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 08, 2019
    Quiz Created by
    Matthew
Back to Top Back to top
Advertisement