Volume 115, 2000
From the journal:

Faraday Discussions

Pulsed field ionization-photoelectron photoion coincidence spectroscopy with synchrotron radiation: The heat of formation of the C2H5+ ion

Tomas Baer,*a   Y. Song,bc   Jianbo Liu,b   Wenwu Chenb  and  C. Y. Ngc  

* Corresponding authors

a Department of Chemistry, Uniersity of North Carolina, Chapel Hill, NC, USA

b Lawrence Berkeley National Laboratory Chemical Sciences Diision, Berkeley, CA, USA

c Department of Chemistry, Iowa State Uniersity, Ames, IA, USA

Abstract

Pulsed field ionization photoelectron (PFI-PE) spectroscopy combined with ion coincidence detection has been used with multi-bunch synchrotron radiation at the Advance Light Source (ALS) to energy select ions and to measure their breakdown diagram. The resolution for ion state selection achieved with Ar+ (2P3/2,1/2) employing this PFI-PE-photoion coincidence apparatus is 0.6 meV (full width at half maximum). The production of C2H5+ from C2H5Br was investigated near the dissociative photoionization limit with this pulsed field ionization-threshold photoelectron photoion coincidence (PFI-PEPICO) scheme. Although the PFI-PE spectra of C2H5Br, C2H5I, and benzene show that the production of ions in the Franck–Condon gap regions is quite low, the selectivity for PFI-PE detection and the suppression of prompt electrons is such that we can detect 1 PFI-PE out of 25000 total electrons s−1. The derived C2H5+ heat of formation from the analysis of the C2H5Br+ breakdown diagram and a critical analysis of other results is 900.5±2.0 kJ mol−1 at 298 K, or 913.2±2.0 kJ mol−1 at 0 K. This leads to an ethylene proton affinity at 298 K of 682.0 kJ mol−1. The measured IE of C2H5Br is 10.307 eV.

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Article information

DOI
https://doi.org/10.1039/A909621C
Article type
Paper
Submitted
06 Dec 1999
First published
17 Apr 2000

Faraday Discuss., 2000,115, 137-145

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Pulsed field ionization-photoelectron photoion coincidence spectroscopy with synchrotron radiation: The heat of formation of the C2H5+ ion

T. Baer, Y. Song, J. Liu, W. Chen and C. Y. Ng, Faraday Discuss., 2000, 115, 137 DOI: 10.1039/A909621C

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