1 / 22

Electron Microscopes

Electron Microscopes. Explain how the main features of a Scanning Tunnelling Microscope allow an image to be formed Explain how the main features of a Transmission Electron Microscope allow an image to be formed. Explain what the resolution of a TEM is limited by.

nelle-pickett
Download Presentation

Electron Microscopes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Electron Microscopes Explain how the main features of a Scanning Tunnelling Microscope allow an image to be formed Explain how the main features of a Transmission Electron Microscope allow an image to be formed. Explain what the resolution of a TEM is limited by.

  2. Transmission Electron Microscope (TEM 1931 Scanning Tunnelling Microscope (STM) 1981

  3. The foundations of electron microscopy Quantum tunnelling Piezoelectricity Resolution

  4. How does a camera move the lens accurately enough to focus the image?

  5. Piezoelectric transducer • A TRANSDUCER changes energy between different forms • Piezoelectric materials: Voltage  Strain • So apply a voltage  Get a strain • Max strain is ~0.1%

  6. Aside on how it works…. • Lead Zirconate Titanate (PZT)

  7. Ticking clocks • Quartz is a piezoelectric • And it has a natural frequency (as does everything) • So as it vibrates it creates a stable oscillating voltage

  8. Resolution • What does the diffraction pattern from a single slit look like?

  9. Onward to the microscopes • Two stations, one for each type of microscope. • Complete the tasks at each station, following the task list. • Check your learning against the understanding checklist. • Extension: Read one of the articles related to today’s lesson (quantum tunnelling, uses of piezoelectrics, top-of-the-range electron microscopes)

More Related