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Simultaneous tracking of ultrafast surface and gas-phase dynamics in solid-gas interfacial reactions.
Blackman, Keith; Segrest, Eric; Turner, George; Machamer, Kai; Gupta, Aakash; Khan Pathan, Md Afjal; Berriel, S Novia; Banerjee, Parag; Vaida, Mihai E.
Afiliación
  • Blackman K; Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
  • Segrest E; Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
  • Turner G; Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
  • Machamer K; Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
  • Gupta A; Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
  • Khan Pathan MA; Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
  • Berriel SN; Department of Material Science and Engineering, University of Central Florida, Orlando, Florida 32816, USA.
  • Banerjee P; Department of Material Science and Engineering, University of Central Florida, Orlando, Florida 32816, USA.
  • Vaida ME; Nano Science and Technology Center, University of Central Florida, Orlando, Florida 32816, USA.
Rev Sci Instrum ; 95(8)2024 Aug 01.
Article en En | MEDLINE | ID: mdl-39133084
ABSTRACT
Real-time detection of intermediate species and final products at the surface and near-surface in interfacial solid-gas reactions is critical for an accurate understanding of heterogeneous reaction mechanisms. In this article, an experimental method that can simultaneously monitor the ultrafast dynamics at the surface and above the surface in photoinduced heterogeneous reactions is presented. This method relies on a combination of mass spectrometry and femtosecond pump-probe spectroscopy. As a model system, the photoinduced reaction of methyl iodide on and above a cerium oxide surface is investigated. The species that are simultaneously detected from the surface and gas-phase present distinct features in the mass spectra, such as a sharp peak followed by an adjacent broad shoulder. The sharp peak is attributed to the species detected from the surface, while the broad shoulder is due to the detection of gas-phase species above the surface, as confirmed by multiple experiments. By monitoring the evolution of the sharp peak and broad shoulder as a function of the pump-probe time delay, transient signals are obtained that describe the ultrafast photoinduced reaction dynamics of methyl iodide on the surface and in the gas-phase. Finally, SimION simulations are performed to confirm the origin of the ions produced on the surface and in the gas-phase.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Rev Sci Instrum Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Rev Sci Instrum Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos