Emerging Nonvalence Anion States of [Isoprene-H·]·H2O Accessed via Detachment of OH–·Isoprene
| Autor: | Marissa A. Dobulis, Michael C. Thompson, Kellyn M. Patros, Caroline Chick Jarrold, Thomas Sommerfeld |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry A. 124:2279-2287 |
| ISSN: | 1520-5215 1089-5639 |
| DOI: | 10.1021/acs.jpca.0c01250 |
| Popis: | The anion photoelectron imaging spectra of an ion with m/z 85, generated under ion source conditions that optimize ·OH production in a co-expansion with isoprene, are presented and analyzed with supporting calculations. A spectroscopic feature observed at a vertical electron detachment energy of 2.45 eV, which dominates the photoelectron spectrum measured at 3.495 eV photon energy, is consistent with the OH−·isoprene ion-molecule complex, while additional signal observed at lower electron binding energy can be attributed to other constitutional isomers. However, spectra measured over a 2.2 to 2.6 eV photon energy range, i.e., from near threshold of the predominant OH−·isoprene detachment feature through the vertical detachment energy, exhibit sharp features with common electron kinetic energies, suggesting autodetachment from a temporary anion prepared by photoexcitation. The photon energy independence of the electron kinetic energy of these features along with the low dipole moment predicted for the neut... |
| Databáze: | OpenAIRE |
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