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- W2134607148 abstract "Hydrogen bond pairs involving the chromophore indole have been extensively studied in the gas phase. Here, we report high resolution electronic spectroscopy experiments on the indole-NH(3) hydrogen bond pair in the absence and presence of an electric field. The S(1)-S(0) origin band of this complex recorded in zero field at high resolution reveals two overlapping spectra; a consequence of NH(3) hindered internal rotation. The barrier to internal rotation is predicted by theory to be less than 20 cm(-1) in the ground state, therefore requiring a non-rigid rotor Hamiltonian to interpret the spectra. Conducting the experiment in the presence of an applied electric field further perturbs the already congested spectrum of the complex, but makes possible the measurement of the permanent electric dipole moments in its S(0) and S(1) states. These values reveal significant changes in electron distribution that arise from hydrogen bonding effects." @default.
- W2134607148 created "2016-06-24" @default.
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- W2134607148 date "2012-01-01" @default.
- W2134607148 modified "2023-10-16" @default.
- W2134607148 title "Experimentally measured permanent dipoles induced by hydrogen bonding. The Stark spectrum of indole–NH3" @default.
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- W2134607148 doi "https://doi.org/10.1039/c2cp23902g" @default.
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