Available online
Description
The programme features Albert Crewe who describes the principles of the scanning transmission electron microscope which enabled him to become the first man to obtain images of single atoms.
The programme features Albert Crewe who describes the principles of the scanning transmission electron microscope which enabled him to become the first man to obtain images of single atoms.
| Module code and title: | ST291, Images and information |
|---|---|
| Item code: | ST291; 14 |
| First transmission date: | 08-09-1977 |
| Published: | 1977 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:23:55 |
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| Publisher: | BBC Open University |
| Keyword(s): | Atoms; Electron microscope; Herpes virus; Scanning transmission; STEM |
| Footage description: | Barrie Jones introduces the programme. Shots of individual atoms taken with a scanning transmission electron microscope (STEM) Albert Crewe discusses the limitations of conventional transmission electron microscopes (CTEM). He draws a schematic diagram of a CTEM on a blackboard as he talks. Crewe goes on to explain the basic principles' of the scanning electron microscope. Crewe describes the STEM in greater detail. He points out, semi-quantitatively, ways in which the resolution of this instrument can be made to match the resolution of the CTEM. Crewe writes and draws on a blackboard as he talks. Crewe explains why, although in principle both types of instrument have the same resolving power, the STEM microscope can achieve limiting resolution while the other cannot, draws a diagram on the blackboard to show how elastically scattered electrons are detected in the STEM. Crewe, again using the blackboard, explains how inelastically scattered electrons are detected in an STEM. Film shots of the STEM at the Enrico Fermi Institute, University of Chicago. Albert Crewe points out the various component parts of the instruments. Film of STEM Micrographs of a Herpies virus built up from elastically and then inelastically scattered electrons. Commentary by Crewe. He then goes on to explain, briefly, the special steps which must be taken to image individual atoms with this instrument. Credits (over shots of individual uranium atoms on a carbon film). |
| Master spool number: | HOU2417 |
| Production number: | 00525_1254 |
| Videofinder number: | 2125 |
| Available to public: | no |
