Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 125, Issue 15, Pages 3059-3076Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.1c00361
Keywords
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Funding
- Alexander von Humboldt Foundation
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [217133147/SFB 1073]
- Agence Nationale de la Recherche (ANR)
- DFG [WO 1541/1-1]
- DFG
- Volkswagenstiftung [INST 186/902-1]
- Ministerium fur Wissenschaft und Kultur (MWK) Niedersachsen
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A new instrument has been developed to study surface scattering using photolysis and Rydberg atom tagging. By conducting experiments under strict conditions, researchers have gained insights into the adsorption mechanisms of H atoms on metal and graphene surfaces. Future perspectives on H atom scattering from surfaces are also discussed.
We have developed an instrument that uses photolysis of hydrogen halides to produce nearly monoenergetic hydrogen atom beams and Rydberg atom tagging to obtain accurate angle-resolved time-of-flight distributions of atoms scattered from surfaces. The surfaces are prepared under strict ultrahigh vacuum conditions. Data from these experiments can provide excellent benchmarks for theory, from which it is possible to obtain an atomic scale understanding of the underlying dynamical processes governing H atom adsorption. In this way, the mechanism of adsorption on metals is revealed, showing a penetration-resurfacing mechanism that relies on electronic excitation of the metal by the H atom to succeed. Contrasting this, when H atoms collide at graphene surfaces, the dynamics of bond formation involving at least four carbon atoms govern adsorption. Future perspectives of H atom scattering from surfaces are also outlined.
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