R2PI spectrum of caffeine. The intensity is not normalized against the laser fluence.
R2PI spectrum of theophylline, a demethylated caffeine derivative.
UV-UV double resonance spectrum of caffeine (top) and its R2PI spectrum (bottom).
Optimized structures and relative energies of caffeine calculated at the level.
R2PI spectrum of (a) caffeine and (b) Caff-.
Optimized structures and relative energies of Caff- calculated at the level.
One-color R2PI mass spectrum of hydrated caffeine clusters obtained by (a) an laser pulse and (b) a laser pulse at . Peaks denoted by an asterisk represent impurities from pump oil.
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