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In the mass spectrum of pentane, the presence of a peak with m/z = 15 is most likely to the detection of a methyl radical cation.
The m/z ratios of the ions contained in a sample displayed against their intensities form a mass spectrum. The height of the peaks in a mass spectrum denotes the relative abundance of the various components in the sample, and each peak in a mass spectrum displays a component of distinct m/z in the sample.
Only when a molecule has been transformed into a gas-phase ion can a mass spectrometer calculate the mass of the molecule. In order to do this, it gives molecules an electrical charge and transforms the flow of electrically charged ions that results into a proportional electrical current that a data system can subsequently read.
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