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EXCITED STATE PERTURBATIONS OF 7-AZAINDOLE MEDIATED THROUGH MICRO-SOLVATION.\thanksWork supported by NSF(CHE-0911117).

JUSTIN W. YOUNG AND DAVID W. PRATT, Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260.

7-azaindole readily forms water clusters when seeded into a molecular beam. Interestingly, the addition of water considerably perturbs the excited state of 7-azaindole: the electronic origin of 7-azaindole(H₂O) is shifted drastically to lower energy, ~1290 cm^-1, relative to the origin of the bare molecule; furthermore, recent evidence indicates that 7-azaindole(H₂O) is of L_a character, contrary to the bare molecule. In this work, high resolution electronic spectra of 7-azaindole(H₂O) were measured in the presence of an external electric field , as a means to study water induced changes in the electronic distribution of 7-azaindole. Furthermore, the L_a/L_b character of the excited state of 7-azaindole(H₂O) was examined by recording similar spectra of isotopically labeled species.