Abstract
Full text:The ultrafast dissociation of methanol and formic acid after excitation of the O 1s to 3s resonances has been studied by photoemission. The resonant decay spectrum shows two classes of features: resonantly enhanced valence bands that disperse with photon energy, and Resonant Auger peaks that are stationary in kinetic energy. On deuteration of the molecules, some stationary peaks change intensity significantly. This is the signature that they are due to decay of oxygen 1s excited methoxy (CH3O*) and formlyoxyl (HCO*2) radicals. The bond to the acid hydrogen is broken before the core decay, and deuteration slows this process. This work extends the literature on hydrogen halides, other diatomics and water to more complex molecules. In diatomics there is only one bond that can break, but in polyatomics molecules there is competition. Scission of the carbon-oxygen bond is thermodynamically more favourable, but OH bond breaking occurs because it is faster. Besides the O 1s resonant Auger decay of these species we also report the valence band resonant spectra. The whole valence band resonates and not just the symmetry allowed states, suggesting that vibronic coupling is significant.
Prince, K C;
[1]
INFM-TASC, Trieste;
[2]
Richter, R;
[1]
De Simone, M;
[3]
Coreno, M;
[4]
Farrokhpour, H;
Tabrizchi, M;
[5]
Isfahn University of Technology (Iran, Islamic Republic of)]
- Sincrotrone Trieste (Italy)
- Italy
- INFM-TASC, Trieste (Italy)
- CNR-IMIP, Roma (Italy)
- The Abdus Salam International Centre for Thoretical Physics (Italy)
Citation Formats
Prince, K C, INFM-TASC, Trieste, Richter, R, De Simone, M, Coreno, M, Farrokhpour, H, Tabrizchi, M, and Isfahn University of Technology (Iran, Islamic Republic of)].
Ultrafast dissociation of methanol and formic acid at the oxygen K edge.
Australia: N. p.,
2004.
Web.
Prince, K C, INFM-TASC, Trieste, Richter, R, De Simone, M, Coreno, M, Farrokhpour, H, Tabrizchi, M, & Isfahn University of Technology (Iran, Islamic Republic of)].
Ultrafast dissociation of methanol and formic acid at the oxygen K edge.
Australia.
Prince, K C, INFM-TASC, Trieste, Richter, R, De Simone, M, Coreno, M, Farrokhpour, H, Tabrizchi, M, and Isfahn University of Technology (Iran, Islamic Republic of)].
2004.
"Ultrafast dissociation of methanol and formic acid at the oxygen K edge."
Australia.
@misc{etde_20601706,
title = {Ultrafast dissociation of methanol and formic acid at the oxygen K edge}
author = {Prince, K C, INFM-TASC, Trieste, Richter, R, De Simone, M, Coreno, M, Farrokhpour, H, Tabrizchi, M, and Isfahn University of Technology (Iran, Islamic Republic of)]}
abstractNote = {Full text:The ultrafast dissociation of methanol and formic acid after excitation of the O 1s to 3s resonances has been studied by photoemission. The resonant decay spectrum shows two classes of features: resonantly enhanced valence bands that disperse with photon energy, and Resonant Auger peaks that are stationary in kinetic energy. On deuteration of the molecules, some stationary peaks change intensity significantly. This is the signature that they are due to decay of oxygen 1s excited methoxy (CH3O*) and formlyoxyl (HCO*2) radicals. The bond to the acid hydrogen is broken before the core decay, and deuteration slows this process. This work extends the literature on hydrogen halides, other diatomics and water to more complex molecules. In diatomics there is only one bond that can break, but in polyatomics molecules there is competition. Scission of the carbon-oxygen bond is thermodynamically more favourable, but OH bond breaking occurs because it is faster. Besides the O 1s resonant Auger decay of these species we also report the valence band resonant spectra. The whole valence band resonates and not just the symmetry allowed states, suggesting that vibronic coupling is significant.}
place = {Australia}
year = {2004}
month = {Jul}
}
title = {Ultrafast dissociation of methanol and formic acid at the oxygen K edge}
author = {Prince, K C, INFM-TASC, Trieste, Richter, R, De Simone, M, Coreno, M, Farrokhpour, H, Tabrizchi, M, and Isfahn University of Technology (Iran, Islamic Republic of)]}
abstractNote = {Full text:The ultrafast dissociation of methanol and formic acid after excitation of the O 1s to 3s resonances has been studied by photoemission. The resonant decay spectrum shows two classes of features: resonantly enhanced valence bands that disperse with photon energy, and Resonant Auger peaks that are stationary in kinetic energy. On deuteration of the molecules, some stationary peaks change intensity significantly. This is the signature that they are due to decay of oxygen 1s excited methoxy (CH3O*) and formlyoxyl (HCO*2) radicals. The bond to the acid hydrogen is broken before the core decay, and deuteration slows this process. This work extends the literature on hydrogen halides, other diatomics and water to more complex molecules. In diatomics there is only one bond that can break, but in polyatomics molecules there is competition. Scission of the carbon-oxygen bond is thermodynamically more favourable, but OH bond breaking occurs because it is faster. Besides the O 1s resonant Auger decay of these species we also report the valence band resonant spectra. The whole valence band resonates and not just the symmetry allowed states, suggesting that vibronic coupling is significant.}
place = {Australia}
year = {2004}
month = {Jul}
}