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Electron Energy Loss Processes in Methyl Methacrylate: Excitation and Bond Breaking

[Image: see text] Details of electron-induced chemistry of methyl methacrylate (MMA) upon complexation are revealed by combining gas-phase 2D electron energy loss spectroscopy with electron attachment spectroscopy of isolated MMA and its clusters. We show that even though isolated MMA does not form...

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Autores principales: Luxford, Thomas F. M., Fedor, Juraj, Kočišek, Jaroslav
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10068740/
https://www.ncbi.nlm.nih.gov/pubmed/36930039
http://dx.doi.org/10.1021/acs.jpca.2c09077
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author Luxford, Thomas F. M.
Fedor, Juraj
Kočišek, Jaroslav
author_facet Luxford, Thomas F. M.
Fedor, Juraj
Kočišek, Jaroslav
author_sort Luxford, Thomas F. M.
collection PubMed
description [Image: see text] Details of electron-induced chemistry of methyl methacrylate (MMA) upon complexation are revealed by combining gas-phase 2D electron energy loss spectroscopy with electron attachment spectroscopy of isolated MMA and its clusters. We show that even though isolated MMA does not form stable parent anions, it efficiently thermalizes the incident electrons via intramolecular vibrational redistribution, leading to autodetachment of slow electrons. This autodetachment channel is reduced in clusters due to intermolecular energy transfer and stabilization of parent molecular anions. Bond breaking via dissociative electron attachment leads to an extensive range of anion products. The dominant OCH(3)(–) channel is accessible via core-excited resonances with threshold above 5 eV, despite the estimated thermodynamic threshold below 3 eV. This changes in clusters, where M(n)OCH(3)(–) anions are observed in a lower-lying resonance due to neutral dissociation of the (1)(n, π*) state and electron self-scavenging. The present findings have implications for electron-induced chemistry in lithography with poly(methyl methacrylate).
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spelling pubmed-100687402023-04-04 Electron Energy Loss Processes in Methyl Methacrylate: Excitation and Bond Breaking Luxford, Thomas F. M. Fedor, Juraj Kočišek, Jaroslav J Phys Chem A [Image: see text] Details of electron-induced chemistry of methyl methacrylate (MMA) upon complexation are revealed by combining gas-phase 2D electron energy loss spectroscopy with electron attachment spectroscopy of isolated MMA and its clusters. We show that even though isolated MMA does not form stable parent anions, it efficiently thermalizes the incident electrons via intramolecular vibrational redistribution, leading to autodetachment of slow electrons. This autodetachment channel is reduced in clusters due to intermolecular energy transfer and stabilization of parent molecular anions. Bond breaking via dissociative electron attachment leads to an extensive range of anion products. The dominant OCH(3)(–) channel is accessible via core-excited resonances with threshold above 5 eV, despite the estimated thermodynamic threshold below 3 eV. This changes in clusters, where M(n)OCH(3)(–) anions are observed in a lower-lying resonance due to neutral dissociation of the (1)(n, π*) state and electron self-scavenging. The present findings have implications for electron-induced chemistry in lithography with poly(methyl methacrylate). American Chemical Society 2023-03-17 /pmc/articles/PMC10068740/ /pubmed/36930039 http://dx.doi.org/10.1021/acs.jpca.2c09077 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Luxford, Thomas F. M.
Fedor, Juraj
Kočišek, Jaroslav
Electron Energy Loss Processes in Methyl Methacrylate: Excitation and Bond Breaking
title Electron Energy Loss Processes in Methyl Methacrylate: Excitation and Bond Breaking
title_full Electron Energy Loss Processes in Methyl Methacrylate: Excitation and Bond Breaking
title_fullStr Electron Energy Loss Processes in Methyl Methacrylate: Excitation and Bond Breaking
title_full_unstemmed Electron Energy Loss Processes in Methyl Methacrylate: Excitation and Bond Breaking
title_short Electron Energy Loss Processes in Methyl Methacrylate: Excitation and Bond Breaking
title_sort electron energy loss processes in methyl methacrylate: excitation and bond breaking
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10068740/
https://www.ncbi.nlm.nih.gov/pubmed/36930039
http://dx.doi.org/10.1021/acs.jpca.2c09077
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