Abstract
Desorption from solid water surfaces resulting from interaction with electromagnetic and particle radiation is reviewed in the context of the role of nonthermal desorption in astrophysical environments. Experimental observations are interpreted in terms of mechanisms sharing a common basis in the Menzel-Gomer-Redhead framework underpinned by exciton-driven electronic excitations in the solid state. The resulting desorption efficiency is discussed in terms of the energy dependence of photon absorption, particle scattering, and the efficacy of exciton formation and diffusion. Selected examples from the literature are used to highlight the importance of this mechanism in driving desorption of adsorbates following absorption by substrate or adsorbate molecules. Efficient exciton migration, facilitated by the hydrogen-bonding network in solid water, plays a crucial role in enhancing desorption rates. Given the dominance of water ices in many astrophysical environments, exciton-driven desorption and chemistry are likely important processes under such conditions.
| Original language | English |
|---|---|
| Title of host publication | Encyclopedia of Interfacial Chemistry : Surface Science and Electrochemistry |
| Editors | Klaus Wandelt |
| Number of pages | 13 |
| Place of publication | Oxford |
| Publisher | Elsevier |
| Publication date | 1 Jan 2018 |
| Pages | 383-395 |
| ISBN (Print) | 978-0-12-809894-3 |
| ISBN (Electronic) | 9780128098943 |
| DOIs | |
| Publication status | Published - 1 Jan 2018 |
| Externally published | Yes |
Keywords
- Adsorbate
- Amorphous solid water
- Astrochemistry
- Benzene
- Carbon monoxide
- Desorption
- Electronic excitation
- Exciton
- Nonthermal desorption
- Quadrupole mass spectrometry
- Reflection-absorption infrared spectroscopy
- Temperature-programmed desorption
- Water