Abstract

Ultraviolet absorption bands of hydrogen-bonded dimers and trimers of indazole (Ia2, Ia3) and several indazole-water complexes (Ia·H2O, Ia·(H2O)2, and Ia2·H2O) have been identified in a He supersonic jet seeded with indazole vapor. Spectra were recorded using laser induced fluorescence (LIF) excitation, burn-probe type fluorescence-dip hole-burning, and one-color mass-resolved resonance enhanced two-photon ionization (R2PI) spectroscopies. Excitation laser power dependent changes in the spectra have been ascribed to optical saturation, dissociation by breaking of hydrogen bonds of a complex, and other fragmentation effects.

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