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Vacuum-UV negative photoion spectroscopy of SF5CF3

Simpson, M. J. and Tuckett, R. P. and Dunn, K. and Hunniford, A. and Latimer, C. J. and Scully, S. W. J. (2008) Vacuum-UV negative photoion spectroscopy of SF5CF3. The Journal of Chemical Physics, 128 (12). pp. 124315-1. ISSN 0021-9606

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URL of Published Version: http://dx.doi.org/10.1063/1.2894869

Identification Number/DOI: doi:10.1063/1.2894869

Ion pair formation, generically described as AB \(\rightarrow\) A\(^+\) + B\(^-\), from vacuum-UV photoexcitation of trifluoromethyl sulfur pentafluoride, SF\(_5\)CF\(_3\), has been studied by anion mass spectrometry using synchrotron radiation in the photon energy range 10-35 eV. The anions F\(^-\), F\(_2\)\(^-\) and SF\(_X\)\(^-\) (x = 1-5) are observed. With the exception of SF\(_5^-\), the anions observed show a linear dependence of signal with pressure, showing that they arise from ion pair formation. SF\(_5^-\) arises from dissociative electron attachment, following photoionization of SF\(_5\)CF\(_3\) as the source of low-energy electrons. Cross sections for anion production are put on to an absolute scale by calibration of the signal strengths with those of F\(^-\) from both SF\(_6\) and CF\(_4\). Quantum yields for anion production from SF\(_5\)CF\(_3\), spanning the range 10\(^{-7}\) to 10\(^{-4}\), are obtained using vacuum-UV absorption cross sections. Unlike SF\(_6\) and CF\(_4\), the quantum yield for F\(^-\) production from SF\(_5\)CF\(_3\) increases above the onset of photoionization.

Type of Work:Article
Date:2008 (Publication)
School/Faculty:Schools (1998 to 2008) > School of Chemical Sciences
Department:School of Chemistry
Subjects:QD Chemistry
QC Physics
Institution:University of Birmingham
Copyright Holders:American Institute of Physics
ID Code:738
Refereed:YES
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