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Module 1: Isótopos y masa atómica relativa

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Espectroscopía de masas

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XSIQ
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Chemistry - Mass spectroscopy

Mass spectroscopy

After the analytical machine known as the mass spectrometer was invented
by Francis Aston in 1919, isotopes were found to exist for most of the
known elements.

Fundamentally, a mass spectrometer separates the particles in a sample
according to theirAs well as identifying elements and quantifying their
isotopic makeup, mass spectrometers are used to identify molecules and
determine their structure.

When a gaseous sample of an element is injected into a mass spectrometer,
the individual atoms assume a positive charge as they pass through the
ionising source - an electron is knocked off each atom. As the ions pass
through the electric field, they are accelerated and then separated
according to their masses in a magnetic field.

The output of a mass spectrometer is called a mass spectrum. The mass
spectrum of an element effectively shows the relative abundance of each
isotope against relative isotopic mass. The diagram below represents the
mass spectrum of the element gallium:

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