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Title: Combustion Reactions Followed by Photoelectron Photoion Coincidence Spectroscopy.

Abstract

Abstract not provided.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1404767
Report Number(s):
SAND2016-10083C
648117
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the Gordon Conference on Photoionization and Photodetachment held February 7-12, 2016 in Barga, Tuscany, Italy.
Country of Publication:
United States
Language:
English

Citation Formats

Krisztina Voronova, Andras Bodi, Patrick Hemberger, Oliver Welz, Krisztian Torma, Kyle Covert, and Balint Sztaray. Combustion Reactions Followed by Photoelectron Photoion Coincidence Spectroscopy.. United States: N. p., 2016. Web.
Krisztina Voronova, Andras Bodi, Patrick Hemberger, Oliver Welz, Krisztian Torma, Kyle Covert, & Balint Sztaray. Combustion Reactions Followed by Photoelectron Photoion Coincidence Spectroscopy.. United States.
Krisztina Voronova, Andras Bodi, Patrick Hemberger, Oliver Welz, Krisztian Torma, Kyle Covert, and Balint Sztaray. 2016. "Combustion Reactions Followed by Photoelectron Photoion Coincidence Spectroscopy.". United States. doi:. https://www.osti.gov/servlets/purl/1404767.
@article{osti_1404767,
title = {Combustion Reactions Followed by Photoelectron Photoion Coincidence Spectroscopy.},
author = {Krisztina Voronova and Andras Bodi and Patrick Hemberger and Oliver Welz and Krisztian Torma and Kyle Covert and Balint Sztaray},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month =
}

Conference:
Other availability
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  • Angular distributions from molecular ion dissociation found previously to be anisotropic, demonstrating that the decay lifetimes are there shorter than the rotation periods, give the expectation that the majority of fast molecular ion dissociations will show angular anisotropies when examined by the coincidence method. 1 reference. (JFP)
  • The Photoion-Photoelectron coincidence (PIPECO) technique, in which nominally zero-kinetic energy electrons are detected in coincidence with their concomitant parent or fragment ions, can be used to measure the absolute fragmentation rates and kinetic energy release distributions (KERDS) of gas phase state selected ions. This lecture will be used to review the technique and discuss results for the unimolecular decomposition of the following metastable molecular ions: C/sub 6/H/sub 5/X/sup +/(X=Cl,Br,I), C/sub 8/H/sub 8//sup +/, C/sub 6/H/sub 6//sup +/, C/sub 4/H/sub 4/X/sup +/(X=O,NH). Analysis of their associated photoionization efficiency curves and threshold photoelectron spectra together with a comparison of their measured dissociationmore » rates with those calculated using statistical theories will be used to demonstrate the versatility of the technique in establishing metastable molecular ion dissociation mechanisms.« less
  • The paper describes a technique of extraction-field pulsing, whereby the energy resolution in fixed-wavelength photoelectron--photoion coincidence spectroscopy can be substantially improved and extended light sources can be used.
  • We have developed a sensitive and generally applicable scheme for performing pulsed field ionization (PFI) photoelectron (PFI-PE)-photoion coincidence (PFI-PEPICO) spectroscopy using two-bunch and multibunch synchrotron radiation at the Advanced Light Source. We show that this technique provides an ion internal state (or energy) selection limited only by the PFI-PE measurement. Employing a shaped pulse for PFI and ion extraction, a resolution of 0.6 meV [full width at half maximum (FWHM)] is observed in the PFI-PEPICO bands for Ar{sup +}({sup 2}P{sub 3/2,1/2}). As demonstrated in the PFI-PEPICO study of the process, O{sub 2}+h{nu}{r_arrow}O{sub 2}{sup +}(b&hthinsp;{sup 4}{Sigma}{sub g}{sup {minus}},&hthinsp;v{sup +}=4,&hthinsp;N{sup +})+e{sup {minus}}{r_arrow}O{supmore » +}({sup 4}S)+O({sup 3}P)+e{sup {minus}}, the dissociation of O{sub 2}{sup +}(b&hthinsp;{sup 4}{Sigma}{sub g}{sup {minus}},&hthinsp;v{sup +}=4) in specific rotational N{sup +} levels can be examined. The simulation of the experimental breakdown diagram for this reaction supports the conclusion that the threshold for the formation of O{sup +}({sup 4}S)+O({sup 3}P) from O{sub 2}{sup +}(b&hthinsp;{sup 4}{Sigma}{sub g}{sup {minus}},&hthinsp;v{sup +}=4) lies at N{sup +}=9. We have also recorded the PFI-PEPICO time-of-flight (TOF) spectra of O{sup +} formed in the dissociation of O{sub 2}{sup +}(b&hthinsp;{sup 4}{Sigma}{sub g}{sup {minus}},&hthinsp;v{sup +}=4{endash}7). The simulation of these O{sup +} TOF spectra indicates that the PFI-PEPICO method is applicable for the determination of kinetic energy releases. Previous PFI-PE studies on O{sub 2} suggest that a high-{ital n} O{sub 2} Rydberg state [O{sub 2}{sup {asterisk}}(n)] with a dissociative ion core undergoes prompt dissociation to yield a high-n{sup {prime}} O-atom Rydberg state [O{sup {asterisk}}(n{sup {prime}})] [Evans {ital et al.}, J. Chem. Phys. {bold 110}, 315 (1999)]. The subsequent PFI of O{sup {asterisk}}(n{sup {prime}}) accounts for the formation of a PFI-PE and O{sup +}. Since the PFI-PE intensities for O{sup +} and O{sub 2}{sup +} depend on the lifetimes of O{sup {asterisk}}(n{sup {prime}}) and O{sub 2}{sup {asterisk}}(n), respectively, the PFI-PE intensity enhancement observed for rotational transitions to O{sub 2}{sup +}(b&hthinsp;{sup 4}{Sigma}{sub g}{sup {minus}},&hthinsp;v{sup +}=4,&hthinsp;N{sup +}{ge}9) can be attributed to the longer lifetimes for O{sup {asterisk}}(n{sup {prime}}) than those for O{sub 2}{sup {asterisk}}(n). The PFI-PEPICO study of the dissociation of CH{sub 3}{sup +} from CH{sub 4} also reveals the lifetime effects and dc field effects on the observed intensities for CH{sub 3}{sup +} and CH{sub 4}{sup +}. The high resolution for PFI-PEPICO measurements, along with the ability to distinguish the CH{sub 3}{sup +} fragments due to the supersonically cooled CH{sub 4} beam from those formed by the thermal CH{sub 4} sample, has allowed the determination of a highly accurate dissociation threshold for CH{sub 3}{sup +} from CH{sub 4}. {copyright} {ital 1999 American Institute of Physics.}« less
  • No abstract prepared.