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Updated: Sep 18, 2025

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Detection and Characterization of Water Radical Cations by Mass Spectrometry and Electron Paramagnetic Resonance
Xiaoping Zhang1,2, Minmin Duan1, Konstantin Chingin2
1Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, P. R. China.
None:
Water radical cations (H2O+•) serve as key reactive intermediates in fundamental chemical processes, atmospheric chemistry, and energy-related applications due to their high reactivity and ability to initiate diverse chemical reactions. In this study, we investigated the generation of water dimer radical cations (m/z 36, (H2O)2+•) and their reaction products with different substrates using multiple soft ionization techniques. Our comprehensive analytical platform incorporates corona discharge ionization (CDI), electrospray ionization (ESI), dielectric barrier discharge ionization (DBDI), and microwave plasma torch (MPT), coupled with complementary mass analyzers, including ion trap, Orbitrap, and quadrupole time-of-flight (Q-TOF) mass spectrometers. To confirm the formation of (H2O)2+•, we employed a multitechnique verification strategy combining high-resolution mass spectrometry (MS), isotope labeling technique, tandem MS, and electron paramagnetic resonance (EPR) spectroscopy. The stabilization and reactivity of H2O+• were also examined by using different substrates.
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