Difference between revisions of "Mass spectrometry"

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== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
  
MS
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MS; spectrométrie de mass (Fr.)
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 +
== Additional information ==
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* http://www.nga.gov/resources/scienceresearch/glossary.shtm
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[[Category:Materials database]]
 
[[Category:Materials database]]

Latest revision as of 10:50, 19 February 2014

Description

In mass spectrometry, an instrument is used to produce ions from molecules. Two common ways of doing this are bombarding the sample either with a beam of electrons (electron ionization) or with small molecules such as methane (chemical ionization). The initial ion, called the molecular ion, often undergoes fragmentation into a pattern of smaller molecular weight ions. The ions are separated according to their mass-to-charge ratio and their relative intensities, producing a mass spectrum. In a quadrupole instrument, the ions produced in the source enter a high-vacuum area between rod electrodes maintained at opposite polarity. The application of varying radio frequencies and DC and AC voltages allows only ions with specific mass-to-charge ratios to be ejected to the detector. In ion trap mass spectrometers, the ionization and storage of ions occur in the same location. The ion trap electrodes create a three-dimensional electric field that holds the ions. Application of an appropriate radio frequency voltage is then used to eject ions with specific mass-to-charge ratios. Mass spectrometers frequently serve as detectors for gas or liquid chromatographs

Synonyms and Related Terms

MS; spectrométrie de mass (Fr.)

Additional information

Retrieved from "http://cameo.mfa.org/index.php?title=Mass_spectrometry&oldid=45623"