Multiphoton ionization photoelectron spectroscopy and two-color multiphoton ionization threshold spectroscopy on the hydrogen bonded phenol and 7-azaindole in a supersonic jet
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On thermodynamics of electron, proton and PCET processes of catechol, hydroquinone and resorcinol – Consequences for redox properties of polyphenolic compounds
2022, Journal of Molecular LiquidsCitation Excerpt :The higher energy value of resorcinol can be explained by the electron acceptor effect of hydroxyl group in meta position. The obtained trends agree with experimental gas phase ionisation energies of 765 kJ mol−1/ 7.93 eV (QH2), 786 kJ mol−1/ 8.15 eV (CH2), 791 kJ mol−1/8.20 eV (RH2) and 819 kJ mol−1/8.49 eV (PH) [48]. The reaction ΔG2‡ energy of second electron oxidation of dihydroxybenzenes is increased, i.e., ca 115 kJ mol−1 for CH2, 127 kJ mol−1 for RH2 and 98 kJ mol−1 for QH2.
Dynamics of proton transfer reactions of model base pairs in the ground and excited states: Revisited
2015, Chemical Physics LettersCitation Excerpt :They observed a large increase in the dipole moment, as large as by a factor 2 from that of the zero vibrational level, and they ascribed the increase to a mixing of the Lb state with a σπ*-type state. The earlier papers of the 7-AI dimer reported the spectroscopy for the S1 − S0 transition using the fluorescence excitation and MPI techniques [15,16]. The closely lying two transitions, the origins of which were at 32 252 and 32 290 cm−1, were found; they had completely different spectral features [16].
Theoretical investigation of the hydrogen bonding interaction between substituted phenols and simple O- and N-bases
2010, Journal of Molecular StructureMass analyzed threshold ionization of hydrogen bonded clusters of biological molecules: The 3-methylindole·C<inf>6</inf>H<inf>6</inf> complex
2005, Journal of Electron Spectroscopy and Related PhenomenaChiral clusters in the gas phase
2004, Advances in Physical Organic ChemistryCitation Excerpt :Another consequence of the stronger interactions upon ionization is that the equilibrium geometry of the ionized complex may differ significantly from that of the neutral states. Broadened ionization onsets are frequently attributed to the spectral superposition of ionization into several vibrational levels for which Franck-Condon factors are more favorable.261 As a result, the adiabatic ionization potential may be considerably lower than the vertical potential, and the observed ionization onsets may occur above the adiabatic potential.
Mass analyzed threshold ionization spectroscopy of 7-azaindole cation
2003, Chemical Physics LettersCitation Excerpt :As seen in Fig. 1, the band origin of the S1←S0 electronic transition (EE) appears at 34 631 cm−1, which is in excellent agreement with that measured by using rotationally resolved absorption spectroscopy [6]. The vibronic bands observed in the present experiments are also in very good agreement with those reported in the literature [1,4,7]. However, previous authors did not attempt to assign the spectra.