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Updated: May 10, 2026

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
Published on: August 18, 2012
The nature of the superoxide radical anion in water
Ireneusz Janik1, G N R Tripathi
1Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, USA. ijanik@nd.edu
Abstract:
Vibrational properties of the superoxide radical anion (O2(-●) in liquid water have been experimentally investigated for the first time. The stretching frequency, its shift from the gas-phase to aqueous solution, anharmonicity constant, and the Raman bandwidths provide an insight into the radical-water interactions and the hydration cage. In view of the spectroscopic information obtained in this work, the structural models based on molecular dynamics simulation in solution and gas-phase infrared studies of the water molecules bound to O2(-●) are critically examined.
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