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Couch DE, Buckingham GT, Baraban JH, et al. Tabletop Femtosecond VUV Photoionization and PEPICO Detection of Microreactor Pyrolysis Products. J Phys Chem A. 2017;121(28):5280-5289doi: 10.1021/acs.jpca.7b02821.
Couch, D. E., Buckingham, G. T., Baraban, J. H., Porterfield, J. P., Wooldridge, L. A., Ellison, G. B., Kapteyn, H. C., Murnane, M. M., & Peters, W. K. (2017). Tabletop Femtosecond VUV Photoionization and PEPICO Detection of Microreactor Pyrolysis Products. The journal of physical chemistry. A, 121(28), 5280-5289. https://doi.org/10.1021/acs.jpca.7b02821
Couch, David E, et al. "Tabletop Femtosecond VUV Photoionization and PEPICO Detection of Microreactor Pyrolysis Products." The journal of physical chemistry. A vol. 121,28 (2017): 5280-5289. doi: https://doi.org/10.1021/acs.jpca.7b02821
Couch DE, Buckingham GT, Baraban JH, Porterfield JP, Wooldridge LA, Ellison GB, Kapteyn HC, Murnane MM, Peters WK. Tabletop Femtosecond VUV Photoionization and PEPICO Detection of Microreactor Pyrolysis Products. J Phys Chem A. 2017 Jul 20;121(28):5280-5289. doi: 10.1021/acs.jpca.7b02821. Epub 2017 Jul 10. PMID: 28661692.
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J Phys Chem A. 2017 Jul 20;121(28):5280-5289. doi: 10.1021/acs.jpca.7b02821. Epub 2017 Jul 10.

Tabletop Femtosecond VUV Photoionization and PEPICO Detection of Microreactor Pyrolysis Products.

The journal of physical chemistry. A

David E Couch, Grant T Buckingham, Joshua H Baraban, Jessica P Porterfield, Laura A Wooldridge, G Barney Ellison, Henry C Kapteyn, Margaret M Murnane, William K Peters

Affiliations

  1. JILA and Department of Physics, University of Colorado , Boulder, Colorado 80309, United States.
  2. Department of Chemistry, University of Colorado , Boulder, Colorado 80309, United States.

PMID: 28661692 DOI: 10.1021/acs.jpca.7b02821

Abstract

We report the combination of tabletop vacuum ultraviolet photoionization with photoion-photoelectron coincidence spectroscopy for sensitive, isomer-specific detection of nascent products from a pyrolysis microreactor. Results on several molecules demonstrate two essential capabilities that are very straightforward to implement: the ability to differentiate isomers and the ability to distinguish thermal products from dissociative ionization. Here, vacuum ultraviolet light is derived from a commercial tabletop femtosecond laser system, allowing data to be collected at 10 kHz; this high repetition rate is critical for coincidence techniques. The photoion-photoelectron coincidence spectrometer uses the momentum of the ion to identify dissociative ionization events and coincidence techniques to provide a photoelectron spectrum specific to each mass, which is used to distinguish different isomers. We have used this spectrometer to detect the pyrolysis products that result from the thermal cracking of acetaldehyde, cyclohexene, and 2-butanol. The photoion-photoelectron spectrometer can detect and identify organic radicals and reactive intermediates that result from pyrolysis. Direct comparison of laboratory and synchrotron data illustrates the advantages and potential of this approach.

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