The Functioning of a Mass Spectrometry
When used in conjunction with other identification techniques, such as carbon and proton NMR and IR spectroscopy, mass spectrometry can be highly effective when attempting to determine the identity of an unidentified molecule.
FREMONT, CA: Mass spectrometry (MS) is an analytical laboratory technique that separates sample components based on their mass and electrical charge. A mass spectrometer is an instrument used in MS. It generates a mass spectrum that displays the mass-to-charge ratio (m/z) of compounds in a mixture.
The primary components of a mass spectrometer are the ion source, mass analyzer, and detector.
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Ionization: Initial samples may consist of solids, liquids, or gases. A sample is vaporized into a gas by losing an electron, then ionized by an ion source. Even ordinarily, anionic or nonionic substances are transformed into cations (e.g., halogens like chlorine and noble gases like argon). The ionization chamber is maintained in a vacuum so the generated ions can go through the device without colliding with air molecules. Ionization is caused by electrons produced by heating a metal coil until electrons are released. These electrons collide with the sample molecules, knocking one or more electrons loose. Since it requires more energy to remove multiple electrons, most cations created in the ionization chamber have a single electron charge. A positively charged metal plate propels the sample ions to the subsequent component of the machine.
Acceleration: The ions are subsequently accelerated by a potential difference and concentrated into a beam in the mass analyzer. The objective of acceleration is to provide every species with the same amount of kinetic energy.
Deflection: The ion beam traverses a magnetic field that deflects the charged stream. Lighter or more ionically charged components will deflect more in the field than heavier or less charged components.
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