Mass spectrometer

Mass spectrometer

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Credit: JOHN MCLEAN/SCIENCE PHOTO LIBRARY

Caption: Mass spectrometer. Sensor array of a time of flight secondary ion mass spectrometer (TOF SIMS) seen through a window in its body. The TOF SIMS is used to analyse the surface of a sample. A pulsed ion beam is used to remove molecules from the subject's surface. The molecules are ionised and accelerated towards a detector. The time it takes them to reach the detector depends on their mass. The advantage of this system is that macromolecules (such as polymers or proteins) are not disintegrated by the beam. TOF SIMS is used in coatings research, microelectronics and surface contamination studies.

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Keywords: analysing, analysis, apparatus, chemical, chemistry, equipment, industry, mass spectrometer, secondary ion, sensor array, surface, technology, time of flight, tof sims, window

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