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Fragmentation pattern coefficient

Fragmentation pattern coefficient

The desorbed gases are ionized by the accelerated electrons emitted from the filament of the quadrupole mass spectrometer (QMS).

Since the accelerated electrons have a large energy, cleavage occurs for some of the ions.

For example, the following ions are generated from water (H2O): H2O+, OH+, O+, H+. The molecules that are simply ionized (H2O+) are called molecular ions. The ions generated by cleavage of the H2O+ (OH+, O+, H+) are called fragment ions.


The ratio of molecular ions to fragment ions generated under the same conditions is a fixed value.

Fragmentation pattern coefficient


* The fragmentation pattern coefficient varies slightly depending on the ionization energy and the mass spectrometer.

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