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Resonance-ionization mass spectrometry (RIMS) uses photons to promote an atom or molecule above its ionization potential to create an ion. Since each element has a unique energy level structure , RIMS provides a selective ionization method .
Two examples of RIMS processes In the example on the left one photon resonantly excites an atom to an excited state and a second photon promotes the atom above its ionization potential. The example on the right shows a fully resonant three-photon RIMS process that terminates on an autoionizing level. Instrumentation Please refer to the introductory document on Mass spectrometry . Applications RIMS is useful for studying the electronic structure of atoms or molecules and to make quantitative measurements of analyte concentrations. Related topics:Mass spectrometry (Intro)Ionization methodsIon detectorsResonance-ionization spectroscopy(RIS)Laser-enhanced ionization (LEI)
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