AI Article Synopsis
- The study investigates the vacuum ultraviolet (VUV) photoionization of sulfuric acid (HSO) using advanced synchrotron radiation methods, focusing on the 11-14 eV energy range.
- Researchers measured the adiabatic ionization energy of HSO to be 11.684 ± 0.006 eV and identified three electronic states: XA, AA, and BA.
- As photon energy increases, HSO cations dissociate into HSO and OH fragments, with their dissociation energy recorded at 13.498 ± 0.007 eV; enthalpies of formation for the molecules involved were also determined.
Article Abstract
We present a vacuum ultraviolet (VUV) photoionization study of the gas-phase sulfuric acid (HSO) molecule in the 11-14 eV energy range by using the method of synchrotron radiation-based double imaging photoelectron photoion coincidence (iPEPICO) spectroscopy complemented with accurate theoretical calculations. The slow photoelectron spectrum (SPES) of HSO has been acquired and the three electronic states of HSO, XA, AA and BA have been populated and assigned. The adiabatic ionization energy of the HSO molecule towards the XA cationic ground state is measured at 11.684 ± 0.006 eV, in accordance with high-level calculated findings. With increasing photon energies, the HSO cation dissociates into HSO 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.
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| http://dx.doi.org/10.1039/d1cp05237c | DOI Listing |
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