Field ion microscope
The Field ion microscope (FIM) was invented by Müller in 1951. It is a type of microscope that can be used to image the arrangement of atoms at the surface of a sharp metal tip. On October 11, 1955, Erwin Müller and his Ph.D. student, Kanwar Bahadur (Pennsylvania State University) observed individual tungsten atoms on the surface of a sharply pointed tungsten tip by cooling it to 21 K and employing helium as the imaging gas. Müller & Bahadur were the first persons to observe individual atoms directly.
Words
This table shows the example usage of word lists for keywords extraction from the text above.
| Word | Word Frequency | Number of Articles | Relevance |
|---|---|---|---|
| microscope | 4 | 986 | 0.38 |
| müller | 3 | 1885 | 0.263 |
| atoms | 3 | 2834 | 0.25 |
| ion | 3 | 3870 | 0.24 |
| tungsten | 2 | 475 | 0.206 |