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Excited-state dissociation dynamics of phenol studied by a new time-resolved technique
- Source :
- The Journal of Chemical Physics. 148:074306
- Publication Year :
- 2018
- Publisher :
- AIP Publishing, 2018.
-
Abstract
- Phenol is an important model molecule for the theoretical and experimental investigation of dissociation in the multistate potential energy surfaces. Recent theoretical calculations [X. Xu et al., J. Am. Chem. Soc. 136, 16378 (2014)] suggest that the phenoxyl radical produced in both the X and A states from the O-H bond fission in phenol can contribute substantially to the slow component of photofragment translational energy distribution. However, current experimental techniques struggle to separate the contributions from different dissociation pathways. A new type of time-resolved pump-probe experiment is described that enables the selection of the products generated from a specific time window after molecules are excited by a pump laser pulse and can quantitatively characterize the translational energy distribution and branching ratio of each dissociation pathway. This method modifies conventional photofragment translational spectroscopy by reducing the acceptance angles of the detection region and changing the interaction region of the pump laser beam and the molecular beam along the molecular beam axis. The translational energy distributions and branching ratios of the phenoxyl radicals produced in the X, A, and B states from the photodissociation of phenol at 213 and 193 nm are reported. Unlike other techniques, this method has no interference from the undissociated hot molecules. It can ultimately become a standard pump-probe technique for the study of large molecule photodissociation in multistates.
- Subjects :
- Materials science
010304 chemical physics
Fission
Photodissociation
General Physics and Astronomy
Laser pumping
010402 general chemistry
01 natural sciences
Potential energy
Molecular physics
Dissociation (chemistry)
0104 chemical sciences
Excited state
0103 physical sciences
Molecule
Physical and Theoretical Chemistry
Spectroscopy
Subjects
Details
- ISSN :
- 10897690 and 00219606
- Volume :
- 148
- Database :
- OpenAIRE
- Journal :
- The Journal of Chemical Physics
- Accession number :
- edsair.doi.dedup.....8b85a1c71c7b2188bb9e82fcd1911d9e