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VUV Photoionization Cross Sections of HO_2, H_2O_2, and H_2CO

Dodson, Leah G. and Shen, Linhan and Savee, John D. and Eddingsaas, Nathan C. and Welz, Oliver and Taatjes, Craig A. and Osborn, David L. and Sander, Stanley P. and Okumura, Mitchio (2015) VUV Photoionization Cross Sections of HO_2, H_2O_2, and H_2CO. Journal of Physical Chemistry A, 119 (8). pp. 1279-1291. ISSN 1089-5639.

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The absolute vacuum ultraviolet (VUV) photoionization spectra of the hydroperoxyl radical (HO_2), hydrogen peroxide (H_2O_2), and formaldehyde (H_2CO) have been measured from their first ionization thresholds to 12.008 eV. HO_2, H_2O_2, and H_2CO were generated from the oxidation of methanol initiated by pulsed-laser-photolysis of Cl_2 in a low-pressure slow flow reactor. Reactants, intermediates, and products were detected by time-resolved multiplexed synchrotron photoionization mass spectrometry. Absolute concentrations were obtained from the time-dependent photoion signals by modeling the kinetics of the methanol oxidation chemistry. Photoionization cross sections were determined at several photon energies relative to the cross section of methanol, which was in turn determined relative to that of propene. These measurements were used to place relative photoionization spectra of HO_2, H_2O_2, and H_2CO on an absolute scale, resulting in absolute photoionization spectra.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Dodson, Leah G.0000-0001-5960-056X
Shen, Linhan0000-0003-3871-655X
Eddingsaas, Nathan C.0000-0003-1539-5415
Taatjes, Craig A.0000-0002-9271-0282
Osborn, David L.0000-0003-4304-8218
Sander, Stanley P.0000-0003-1424-3620
Okumura, Mitchio0000-0001-6874-1137
Additional Information:© 2015 American Chemical Society. Received: September 4, 2014. Revised: January 22, 2015. Publication Date (Web): January 26, 2015. Acknowledgment The Caltech effort was supported by the National Science Foundation grants CHE-0957490 and CHE-1413712 and the National Aeronautics and Space Administration’s (NASA) Upper Atmospheric Research Program grant NNX12AI01G. L.G.D. was supported by an EPA STAR Fellowship and a Sandia Campus Executive Fellowship. N.C.E. was supported in part by a Dreyfus Foundation Postdoctoral Fellowship in Environmental Chemistry. Part of this research was carried out by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. The participation of D.L.O., J.D.S., O.W., and C.A.T. and the development and maintenance of the MPIMS apparatus are supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the National Nuclear Security Administration under contract DE-AC04-94-AL85000. The research conducted used resources of the Advanced Light Source, which is a DOE Office of Science User Facility at Lawrence Berkeley National Laboratory under contract DE-AC02-05CH11231. The authors declare no competing financial interest.
Funding AgencyGrant Number
Environmental Protection Agency (EPA)UNSPECIFIED
Sandia Campus Executive FellowshipUNSPECIFIED
Camille and Henry Dreyfus FoundationUNSPECIFIED
Department of Energy (DOE)DE-AC04-94-AL85000
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:8
Record Number:CaltechAUTHORS:20150219-145521644
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Official Citation:VUV Photoionization Cross Sections of HO2, H2O2, and H2CO Leah G. Dodson, Linhan Shen, John D. Savee, Nathan C. Eddingsaas, Oliver Welz, Craig A. Taatjes, David L. Osborn, Stanley P. Sander, and Mitchio Okumura The Journal of Physical Chemistry A 2015 119 (8), 1279-1291 DOI: 10.1021/jp508942a
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55030
Deposited By: Ruth Sustaita
Deposited On:19 Feb 2015 23:53
Last Modified:21 Feb 2020 23:13

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