Dissociation of High-Lying Electronic States of NO2+ in the 15.5–20 eV Region
Autor: | Xiaofeng Tang, Gustavo García, Laurent Nahon |
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Rok vydání: | 2021 |
Předmět: |
010304 chemical physics
Chemistry Walsh diagram Photoionization 010402 general chemistry Kinetic energy 01 natural sciences Dissociation (chemistry) 0104 chemical sciences Ion Fragmentation (mass spectrometry) Autoionization 0103 physical sciences Physical chemistry Physical and Theoretical Chemistry Spectroscopy |
Zdroj: | The Journal of Physical Chemistry A. 125:1517-1525 |
ISSN: | 1520-5215 1089-5639 |
Popis: | We present a dissociative photoionization study of NO2 in the 15.5-20 eV energy range using synchrotron radiation-based double imaging photoelectron photoion coincidence (i2PEPICO) spectroscopy. The high-lying electronic states of the NO2+ cation, c 3B1, C 1B1, d 3A1, e 3B2, and D 1B2, are prepared in well-resolved vibronic states in order to study their individual dissociation mechanisms. Up to eight dissociation limits of NO2+ are reached, and mass-selected threshold photoelectron spectra (TPES) show that the c 3B1, C 1B1, and d 3A1 states predominantly dissociate into the NO+ + O products, while the e 3B2 and D 1B2 states can undergo fragmentation into both the NO+ + O and the O+ + NO channels, as well as the O2+ + N channel with a small yield. Overall, these product yields are found to be quite sensitive to autoionization processes. Mass-selected high-resolution electron and ion kinetic energy correlation diagrams reveal dissociative mechanisms that possess strong state-specific character. |
Databáze: | OpenAIRE |
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