SPUTTERING OF MOLECULAR GAS SOLIDS BY keV IONS

The sputtering of D,O and CO solids by keV ions has been studied by measuring the absolute sputtering yield and the masses of ejected particles. The yield results for several ions on D,O indicate that for the case where the energy deposited in nuclear motion is comparable to that deposited electronically, the sputtering yield is still determined to a large extent by the electronic energy. The mass spectra ejected from D,O by 30 keV Kr” ions have a behavior very much like those produced by MeV ions. The bombardment of CO by Krt results in the rapid production of a dark residue, stable at room temperature, and the ejection of CO, CO,, O,, 0, C,, and‘(CO),.