Atomic structure

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8 Terms

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Protons

Positively charged particles with a relative mass of 1

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Electrons

Negatively charged particles with a relative mass of 1/12000

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Neutrons

Uncharged particles with a relative mass of 1

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Ion

An electrically charged particles formed by loss or gaon of one or more electrons form an atom or group of atoms

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TOF mass spectrometry stages

  1. Ionisation

  2. Acceleration

  3. Flight tube

  4. Ion detection


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Ionisation

  1. Electron Ionisation

  2. Electrospray Ionisation


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Electron Ionisation

The sample being analysed is vaporised and then high energy electrons are fired at it. The high energy electrons come from an ‘electron gun’ which is a hot wire filament with a current running through it that emits electrons.This usually knocks off only one electron from each particle, forming a 1+ ion.

X(g) —> X+ (g) +e-


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Electrospray Ionisation

Sample X is dissolved in a polar