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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...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2023
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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). |
format | Online Article Text |
id | pubmed-10068740 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
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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