Low-Energy (5–120 eV) Electron-Stimulated Dissociation of Amorphous <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">D</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math>O Ice: D( <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></mrow><mi mathvariant="italic">S</mi></math>), O( <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></mrow><mrow><msub><mrow><mi>P</mi></mrow><mrow><mn>2</mn><mo>,</mo><mn>1</mn><mo>,</mo><mn>0</mn></mrow></msub></mrow></math>), and O( <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>1</mn></mrow></msup></mrow><mrow><msub><mrow><mi mathvariant="italic">D</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math>) Yields and Velocity Distributions

Greg A. Kimmel; Thomas M. Orlando

doi:10.1103/PhysRevLett.75.2606

Low-Energy (5–120 eV) Electron-Stimulated Dissociation of Amorphous $D_{2}$ O Ice: D( $^{2} S$ ), O( $^{3} P_{2, 1, 0}$ ), and O( $^{1} D_{2}$ ) Yields and Velocity Distributions

Greg A. Kimmel and Thomas M. Orlando

Phys. Rev. Lett. 75, 2606 – Published 25 September 1995

Abstract

Laser resonance enhanced multiphonon ionization spectroscopy was used to measure yields and velocity distributions of the D $({}^{2}S)$ , O $({}^{3}P_{2, 1, 0})$ , and $O ({}^{1}D_{2})$ produced during low-energy (5–120 eV) electron-beam irradiation of amorphous $D_{2}$ O ice. Electron-stimulated dissociation has a very low energy threshold ( $\sim$ 6–7 eV), and the neutral fragments desorb with low kinetic energies ( $\sim$ 60–85 meV) which are independent of the incident electron energy. The data suggest that desorption of neutral fragments results from dissociation of excited states formed directly or via electron-ion recombination.