## Abstract

The photoionization efficiency (PIE) spectrum of C_{2}H_{5}SO was measured in the spectral range 110-150 nm by means of a photoionization mass spectrometer coupled to a synchrotron radiation source. C_{2}H_{5}SO radicals were generated by reacting O atoms with C_{2}H_{5}SC_{2}H_{5} or C_{2}H_{5}SSC_{2}H_{5} in a discharge flow tube. The ionization energy of C_{2}H_{5}SO was determined to be (8.71±0.02) eV, in agreement with theoretical calculations of 8.8 eV for ionization from C_{2}H_{5}SO to singlet C_{2}H_{5}SO ^{+} using the G2 method. PIE spectrum also shows a sharp increase at 10.0 eV, corresponding to the ionization energy from C_{2}H_{5}SO to triplet C_{2H5}SO ^{+} predicted by theory. Theoretical calculations also predict two stable conformers with similar energies for each of C_{2}H_{5}SO, singlet C_{2}H_{5}SO ^{+}, and triplet C_{2}H_{5}SO ^{+}, respectively; these conformers are indistinguishable in our experiments.

Original language | English |
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Pages (from-to) | 8794-8799 |

Number of pages | 6 |

Journal | Journal of Chemical Physics |

Volume | 107 |

Issue number | 21 |

DOIs | |

State | Published - 1 Dec 1997 |