Mass spectrum of

carbon dioxide

The animation below shows how the carbon dioxide molecule is ionised in a mass spectrometer. Under extreme heat the molecule decomposes into distinct charged fragments (ions). The molecule will always shatter into the same fragments when subjected to the right amount of heat. Every molecule shatters in its own unique way and therefore mass spectrometry can be used to identify chemical substances present in unknown samples. The mass spectrum is the molecule's unique chemical fingerprint, the bigger the molecule the more complex the spectrum becomes.

 

Lets look at carbon dioxide and the way it behaves in a mass spectrometer to give a unique spectrum.
Carbon dioxide is released into the ionising chamber where the heat is enough to shatter the molecule into different fragments. Electrons absorb the energy (heat) and fly off the fragments leaving behind positive charged fragments (ions). Scan the image on the right to reveal the unique fragments that the carbon dioxide molecule shatters into.
Inside the ionising chamber. Scan the image for more information
Each charged fragment will produce its own peak in the spectrum.
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HCl with a charge of 1+ and an isotopic mass of chlorine of 37. HCl with a charge of 1+ and an isotopic mass of chlorine of 35. The chlorine ion with a charge of 1+ and a mass of 35 HCl with a charge of 1+ and an isotopic mass of chlorine of 36. This group of peaks is due to the 2+ ions of the species forming the peaks on the right. The 1+  hydrogen ion The carbon dioxide 1+ ion The carbon monoxide(CO) 1+ ion The oxygen 1+ ion The carbon 1+ ion The oxygen molecule with a charge of 1+ The oxygen molecule with a 2+ charge The oxygen atom with a charge of 2+
Electrons absorbing energy (heat) flying off the atom or molecule. Electrons absorbing energy (heat) flying off the atom or molecule. Electrons absorbing energy (heat) flying off the atom or molecule. Electrons absorbing energy (heat) flying off the atom or molecule. Electrons absorbing energy (heat) flying off the atom or molecule. Oxygen atom with a mass of 16 and a charge of 1+ Electrons absorbing energy (heat) flying off the atom or molecule. Oxygen atom with a mass of 16 and a charge of 1+ Carbon atom with a mass of 12 and a charge of 1+ Carbon monoxide molecule with a mass of 28 and a charge of 1+ Carbon dioxide molecule with a mass of 44 and a charge of 1+ Oxygen atom with a mass of 16 and a charge of 1+