Difference between revisions of "Mass spectrometry"
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== Description == | == 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 | + | 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. |
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| + | The description above obtained from the National Gallery of Art, Scientific Research: [https://www.nga.gov/conservation/glossary.html Glossary of Conservation Terminology] | ||
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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MS; spectrométrie de mass (Fr.) | MS; spectrométrie de mass (Fr.) | ||
| − | == | + | ==Resources and Citations== |
| − | * | + | * Wikipedia: [https://en.wikipedia.org/wiki/Mass_spectrometry Mass spectrometry] |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 11:32, 20 June 2023
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.
The description above obtained from the National Gallery of Art, Scientific Research: Glossary of Conservation Terminology
Synonyms and Related Terms
MS; spectrométrie de mass (Fr.)
Resources and Citations
- Wikipedia: Mass spectrometry