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Advanced Techniques in Molecular Physics: IR-UV Double Resonance and R2PI Spectroscopy

This text discusses sophisticated molecular spectroscopy techniques including IR-UV double resonance and resonant two-photon ionization (R2PI). The IR-UV technique utilizes fixed UV lasers while scanning IR lasers to measure the fluorescence signal as a function of IR frequency, enabling the acquisition of the vibrational spectrum of the ground state. R2PI involves scanning a laser to measure ion signals based on laser frequency, providing superior mass spectroscopic detection. These methods are characterized by their background-free measurements and heightened sensitivity compared to traditional spectroscopy methods.

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Advanced Techniques in Molecular Physics: IR-UV Double Resonance and R2PI Spectroscopy

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  1. From W. Demtröder “Molecular Physics”

  2. From W. Demtröder “Molecular Physics”

  3. from Herzberg: Molecular Spectra & Molecular Structure

  4. from W. Demtröder “Molecular Physics”

  5. IR-UV Double Resonance el. excited state fluorescence X, v=1 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 X, v=0

  6. Resonant Two-Photon Ionization (R2PI) ionization continuum |k> 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 ions, background-free |0>

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