Definition of photoionization in US English:


(British photoionisation)


  • Ionization produced in a medium by the action of electromagnetic radiation.

    • ‘The following interesting features should shed some light on the mechanism of photoionization in duplex DNA.’
    • ‘Firstly, there is no charge separation or corresponding Coulomb attraction barrier, because the electron is ejected and hydrated in the bulk directly by photoionization.’
    • ‘T-rays have low photon energies and will not cause harmful photoionization in biological tissues.’
    • ‘This oxidizing process leads to the formation of a guanine radical cation, similar to that formed by DNA photoionization which may be considered as the main intermediate in DNA oxidation.’
    • ‘Moreover, this spectrum is strikingly similar to the terminal spectrum measured after photoionization of the isolated PYP chromophore in solution.’