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18 Cards in this Set
- Front
- Back
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What does MEIS stand for? |
Medium Energy Ion Scattering |
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what does ISS stand for? What is the relative energy? |
Ion Scattering Spectroscopy. Low |
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What does RBS stand for? |
Rutherford Backscattering |
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What does ERS stand for? |
Elastic Recoil Spectroscopy |
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Explain the optimal ion source? |
Negatively charged Helium is slowly injected into a terminal. All the electrons are stripped of electrons and accelerated towards the sample. |
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How does channelling affect RBS? |
The ions become trapped in crystal structure |
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What do we measure in RBS? |
Kinetic energy of backscattered ions. |
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How do peaks shift if they are deeper in the sample? |
Shift to lower energy |
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How can we remove channelling effects? |
Shift the angle |
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How can we determine the compositional information? |
Position of the peaks and relative integration area |
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Does ERS need a heavier or lighter ion? |
Heavier Ion |
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What ion gives the highest resolution for low mass samples? |
Hydrogen |
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What ion gives the highest resolution for high mass samples? |
Lithium |
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What type of scattering is ERS? |
Forward Scattering |
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How do we filter out impacting ions in ERS? |
A thick filter as lighter elements will penetrate filters better. |
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Why can't we use Hydrogen in ERS? |
We cannot distinguish between incident hydrogens and scattered electrons. |
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What must the relative mass of the ion be compared to the sample in RBS? |
Ion mass must be much smaller for elastic scattering |
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How can we increase the spacing between possible elemental peaks with different depths |
Decrease the angle of the detector |
