Skip to main content

electron-probe microanalyser

electron-probe microanalyser An instrument used to determine the chemical composition of a 1 μm diameter specimen of mineral or glass at the surface of a polished rock or mineral slice. A narrow beam of electrons is focused on to the polished surface of the specimen to cover a 1 μm diameter spot. The electrons excite the atoms in the specimen to emit X-rays, whose wavelength is characteristic of the elements present and whose intensity at a given wavelength is proportional to the relative concentration of the element corresponding to that wavelength. By comparing the X-ray intensity at any one wavelength with that in a standard sample of known composition, the absolute concentration of the element in the sample can be deduced.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"electron-probe microanalyser." A Dictionary of Earth Sciences. . 25 Apr. 2019 <>.

"electron-probe microanalyser." A Dictionary of Earth Sciences. . (April 25, 2019).

"electron-probe microanalyser." A Dictionary of Earth Sciences. . Retrieved April 25, 2019 from

Learn more about citation styles

Citation styles gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, cannot guarantee each citation it generates. Therefore, it’s best to use citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

The Chicago Manual of Style

American Psychological Association

  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.