Abstract
The luminescence induced by the bombardment of thin molecular samples with single MeV atomic ions has been measured by time-correlated single photon counting. The MeV-energy ions (Z=6...79) were produced at the Erlangen tandem accelerator. The samples were layers of POPOP or CsI deposited on a thin polyester foil at a thickness which allows the ions to traverse the samples. The relative photon yield has been found to be proportional to the energy density along the ion trajectory when the initial velocity is kept constant. When the initial velocity of the primary ion was varied, a distinct maximum of the photon yield has been found which is clearly shifted to higher energies compared to the energy of the Bragg maximum. By means of calculations based on the energy deposition of the secondary electrons it was found that the observed luminescence is only produced in the region of low energy density at larger radial distances from the ion track.
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