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MASS ANALYZED THRESHOLD IONIZATION SPECTROSCOPY OF BENZIMIDAZOLE AND BENZOTRIAZOLE CATIONS

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/31523

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Title: MASS ANALYZED THRESHOLD IONIZATION SPECTROSCOPY OF BENZIMIDAZOLE AND BENZOTRIAZOLE CATIONS
Creators: Tzeng, Wen-Bih
Issue Date: 2007
Abstract: The vibrationally resolved cation spectra of benzimidazole and benzotriazole have been recorded by using two-color resonant mass-analyzed threshold ionization spectroscopy. The respective adiabatic ionization energies (IEs) are found to be 67552 and 70474 wavenumbers with an uncertainty of about 5 wavenumbers. Comparing these data with that of indole, one finds that the IE of these aza-aromatic bicyclic molecules increases with the number of the N atoms. Most of the active modes of the benzimidazole cation are related to the in-plane ring vibrations. In contrast, the observed spectral bands of the benzotriazole cation correspond to the out-of-plane N2-H and skeleton N1N2N3 bending vibrations. These experimental findings may be attributed to the nature and the N atoms in the five-membered ring.
URI: http://hdl.handle.net/1811/31523
Other Identifiers: 2007-TB-07
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