Abstract
We report results of laser desorption from water ice surfaces using XUV pulsesfrom the free-electron laser in Hamburg (FLASH). This XUV to soft x-ray FELprovides femtosecond pulses at 20–200 eV photon energy with pulse energies up to100 µJ. The interaction of this intense soft x-ray radiation with ice (H2O,D2O)adsorbed on highly oriented pyrolytic graphite (HOPG) yields the desorption of various ions, particularlyH + (D + ),O + ,O2 + and others.For H + and O + ions linear desorption yields are observed, while forO2 + a highly nonlineardesorption yield with n = (2.5 ± 0.2) is found. Kinetic energies of 1.8 eV, 559 meV and 390 meV forH + ,O + , andO2 + , respectively, account for only a small part of the available excess energy.
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