Multiphoton ionization photoelectron spectroscopy of phenol: Vibrational frequencies and harmonic force field for the 2<i>B</i>1 cation

245

216

Section: A Phenolmentioning

confidence: 99%

High resolution UV spectroscopy of phenol and the hydrogen bonded phenol-water cluster

Berden

Meerts

Schmitt

et al. 1996

245

216

“…a͒ Electronic mail: anderson@chemistry.utah.edu Three vibrational states were studied-the ground state, a state with one quantum of a 516 cm Ϫ1 vibration, and a state with one quantum of an 815 cm Ϫ1 vibration. The vibrations are assigned as v 6a and v 12 , respectively, based on earlier MPI ͑multiphoton ionization͒ photoelectron spectroscopy 26 and our ab initio calculations ͑see below͒. These are both in-plane ring deformations, involving some motion of the OH group as a unit, but with no OH stretching character.…”

Section: Methodsmentioning

confidence: 81%

Vibrational mode and collision energy effects on proton transfer in phenol cation–methylamine collisions

Kim

Green

Anderson

2000

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Articles you may be interested inVibrational mode and collision energy effects on reaction of H 2 CO + with C 2 H 2 : Charge state competition and the role of Franck-Condon factors in endoergic charge transfer Vibrational and collisional energy effects in the reaction of ammonia ions with methylamine Mass-analyzed threshold ionization has been used to prepare vibrationally state-selected phenol cations, that were then reacted with methylamine at collision energies ranging from 0.1 to 2 eV. Integral cross sections and product recoil velocity distributions are reported. Ab initio calculations of stationary points on the surface and RRKM ͑Rice-Ramsperger-Kassel-Marcus͒ analysis of complex lifetimes are also presented for comparison. The only reaction observed over the entire energy range is exoergic proton transfer ͑PT͒. For ground-state reactants, the PT cross section is reduced by increasing collision energy, such that the reaction efficiency declines from ϳ71% at low E collision to ϳ50% at 2 eV. Excitation of either v 6a or v 12 vibrations inhibits reaction over the entire collision energy range, with the effect being somewhat mode-specific and increasing with increasing E collision . At low E collision , both vibrational and collision energy inhibit reaction with similar efficiency. Collision energy effects diminish at high E collision , while vibration continues to have a strong effect. Product ion velocity distributions are approximately forward-backward symmetric at E collision р1 eV, but are backward peaked at high energies. Mechanistic implications of these results are discussed.

“…47 Fe atoms were produced by photolysis of Fe͑CO͒ 5 ͑Aldrich), and the PES peaks of Fe associated with two different REMPI transitions (z 7 D 3 0 Ϫe 7 F 4 at 318.023 nm, and ␣ 3 H 4 Ϫ 3 G 3 0 at 312.044 nm͒ were measured. The photoelectron energies of these peaks were calculated based on the energy levels of Fe and Fe ϩ given by Sugar and Corliss.…”

Section: Methodsmentioning

confidence: 99%

Multiphoton ionization and photoelectron spectroscopy of 1,3-trans-butadiene via its 3dπ Rydberg state

Anderson

2001

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Articles you may be interested inVacuum ultraviolet pulsed field ionization-photoelectron and infrared-photoinduced Rydberg ionization study of trans-1,3-butadieneThe role of symmetry and optical selection rules in revealing the molecular structure of the lowest Rydberg and ionic states of the 1,4-diazabicyclo[2.2.2]octane-Ar n (n=1,2,3) van der Waals complexes J. Chem. Phys. 120, 7894 (2004); 10.1063/1.1691765 (3+1) -resonantly enhanced multiphoton ionization-photoelectron spectroscopy of the (3d-4s) supercomplex of acetylene: The geometry of the E state revisited through experiment and theory Resonance-enhanced multiphoton ionization ͑REMPI͒ and photoelectron spectroscopy ͑PES͒, have been used to study the 1 A g (3d) Rydberg state of 1,3-trans-butadiene in the two photon energy range from 61 000 to 66 400 cm Ϫ1 . The 1 A g (3d) spectrum is dominated by the 4 Ј , 6 Ј , and 9 Ј vibrational modes, with some excitation of the 8 Ј mode, as well. Photoelectron spectroscopy shows that the dominant ionization pathways are diagonal, i.e., they produce cations in the same vibrational level that was populated in the Rydberg state. Weaker off-diagonal ionization is also observed, with excitation of the 4 ϩ , 6 ϩ , and 9 ϩ modes. The relative intensities of diagonal and off-diagonal PES bands are observed to be strongly dependent on the angle between the laser polarization and the detection axis. It is possible to use REMPI to generate state-selected cations, however, the nascent ions are quite efficiently photodissociated by the REMPI laser.