Single photon ionization of hydrogen bonded clusters with a soft x-ray laser : (HCOOH)x and (HCOOH)y(H2O)z
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Pure, neutral formic acid (HCOOH)n+1 clusters and mixed (HCOOH)/(H2O) clusters are investigated employing time of flight mass spectroscopy and single photon ionization at 26.5 eV using a very compact, capillary discharge, soft x-ray laser. During the ionization process, neutral clusters suffer little fragmentation because almost all excess energy above the vertical ionization energy is taken away by the photoelectron, leaving only a small part of the photon energy deposited into the (HCOOH)+n+1 cluster. The vertical ionization energy minus the adiabatic ionization energy is enough excess energy ...