Abstract
Abstract Different damage effects are observed in KDP and ADP when irradiated with light and heavy ion beams. Color centres stable up to 240 K are observed in both compounds irradiated with beams of 22 MeV 2H+ and fluences below 1 × 1016 ions/cm2; a tentative mechanism for their generation is given. For fluences between 1 × 1016 and 2 × 1016 ions/cm2 no further damage is observed in KDP; but ADP crystals show a light color stable up to the melting point and for higher fluences they appear white and opaque: X-ray diffraction patterns show no amorphization; a broad band due to electronic excitations, besides the characteristic Raman spectra is observed. No spontaneous cleavage was ever observed. With 88 MeV 16O6+ ions, as dense valence-electronic and nuclear interactions become important, clustering of point defects and creation of extended defects take place; different damage steps appear progressively, including radiation induced spontaneous cleavage; threshold fluences are given.
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