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from W. Demtröder “Molecular Physics”

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3 IR-UV Double Resonance
X, v=0 el. excited state X, v=1 fluorescence Technique: Fix UV laser, scan IR laser, measure fluorescence signal as function of IR frequency to obtain vibrational spectrum of ground state Advantage: “Action spectroscopy” – probe generation of fluorescence photons, background-free, more sensitive than IR absorption

4 Resonant Two-Photon Ionization (R2PI)
|0> |k> ionization continuum Technique: Scan laser, measure ion signal as function of laser frequency to obtain spectrum of excited state Advantages: Mass spectroscopic detection is very sensitive (much better than UV/vis absorption spectroscopy) “Action spectroscopy” – probe generation of ion, background-free

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