Luminescence of DNA excited in the vacuum ultraviolet

Abstract Pulsed vacuum ultraviolet radiation has been used to excite DNA in the energy range 12 to 30 eV. Time-resolved single-photon counting shows non-exponential luminescence decays over some hundreds of nanoseconds: the application of a magnetic field demonstrates the role of radical-ion recombination and, at higher energies, of fission into two triplet species.