Issue 4, 2022

Vacuum ultraviolet photochemistry of sulfuric acid vapor: a combined experimental and theoretical study

Abstract

We present a vacuum ultraviolet (VUV) photoionization study of the gas-phase sulfuric acid (H2SO4) molecule in the 11–14 eV energy range by using the method of synchrotron radiation-based double imaging photoelectron photoion coincidence (i2PEPICO) spectroscopy complemented with accurate theoretical calculations. The slow photoelectron spectrum (SPES) of H2SO4 has been acquired and the three electronic states of H2SO4+, X2A, A2A and B2A have been populated and assigned. The adiabatic ionization energy of the H2SO4 molecule towards the X2A cationic ground state is measured at 11.684 ± 0.006 eV, in accordance with high-level calculated findings. With increasing photon energies, the H2SO4+ cation dissociates into HSO3+ and OH fragments and their adiabatic appearance energy is measured at 13.498 ± 0.007 eV. Then, the enthalpies of formation for the species involved in the photoionization and dissociative photoionization have been determined through a thermochemical cycle.

Graphical abstract: Vacuum ultraviolet photochemistry of sulfuric acid vapor: a combined experimental and theoretical study

Supplementary files

Article information

Article type
Paper
Submitted
15 nov 2021
Accepted
20 dec 2021
First published
21 dec 2021

Phys. Chem. Chem. Phys., 2022,24, 2015-2021

Vacuum ultraviolet photochemistry of sulfuric acid vapor: a combined experimental and theoretical study

C. Zhang, X. Lin, X. Tang, C. Fittschen, S. Hartweg, G. A. Garcia, B. Long, W. Zhang and L. Nahon, Phys. Chem. Chem. Phys., 2022, 24, 2015 DOI: 10.1039/D1CP05237C

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