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Miller TM, Rodriguez VG, Ard SG, Viggiano AA, Shuman NS. Dissociative electron attachment and Ar+ reaction with chromium hexacarbonyl, 296-400 K. J Chem Phys 2024; 161:126101. [PMID: 39319661 DOI: 10.1063/5.0232322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2024] [Accepted: 09/11/2024] [Indexed: 09/26/2024] Open
Abstract
Dissociative electron attachment rate constants have been measured for Cr(CO)6 under thermal conditions, 296-400 K, yielding Cr(CO)5- product. At 296 K, 2.92 ± 0.70 cm3 s-1 was measured and a small decrease with temperature was observed (2.72 ± 0.70 cm3 s-1 at 400 K). We additionally determined the cation products of Ar+ reacting with Cr(CO)6.
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Affiliation(s)
- Thomas M Miller
- Boston College Institute for Scientific Research, Boston, Massachusetts 02549, USA
| | - Virginia G Rodriguez
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, USA
| | - Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, USA
| | - Albert A Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, USA
| | - Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, USA
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Miller TM, Lewis TWR, Ard SG, Viggiano AA, Shuman NS. Electron and Ar+ interaction with Mo(CO)6 at thermal energies; energetic limit on removal of 5 ligands from Mo(CO)6. J Chem Phys 2023; 159:044303. [PMID: 37486057 DOI: 10.1063/5.0156596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 07/05/2023] [Indexed: 07/25/2023] Open
Abstract
The rate constant for electron attachment to Mo(CO)6 was determined to be ka = 2.4 ± 0.6 × 10-7 cm3 s-1 at 297 K in a flowing-afterglow Langmuir-probe experiment. The sole anion product is Mo(CO)5-. A small decline in ka was observed up to 450 K, and decomposition was apparent at higher temperatures. The charge transfer reaction of Ar+ with Mo(CO)6 is exothermic by 7.59 ± 0.03 eV, which appears to be sufficient to remove the first 5 ligands from Mo(CO)6+.
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Affiliation(s)
- Thomas M Miller
- Boston College Institute for Scientific Research, Boston, Massachusetts 02549, USA
| | - Tucker W R Lewis
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico 87117, USA
| | - Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico 87117, USA
| | - Albert A Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico 87117, USA
| | - Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico 87117, USA
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Dissociative Electron Attachment Cross Sections for Ni(CO)4, Co(CO)3NO, Cr(CO)6. CHEMISTRY 2022. [DOI: 10.3390/chemistry4030072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Ni(CO)4, Cr(CO)6, Co(CO)3NO are some of the most common precursors used for focused electron beam induced deposition. Some of the compounds, even though extensively used have high requirements when it comes to handling being, explosives, highly flammable and with high toxicity levels, as is the case of Ni(CO)4. We are employing simulations to determine values hard to determine experimentally, and compare them with DFT calculations and experimental data where available. The use of Quantemol-N cross section simulations for dissociative electron attachment (DEA) at low electron energy in the range of 0–20 eV, gives valuable information on the fragmentation of the molecules, based on their bond dissociation energies, electron affinities and incident electron energies. The values obtained for the cross sections are 0.12 × 10−18 cm2 for Ni(CO)4, 4.5 × 10−16 cm2 for Co(CO)3NO DEA cross-sections and 4.3 × 10−15 cm2 for Cr(CO)6.
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Shih PY, Cipriani M, Hermanns CF, Oster J, Edinger K, Gölzhäuser A, Ingólfsson O. Low-energy electron interaction and focused electron beam-induced deposition of molybdenum hexacarbonyl (Mo(CO) 6). BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2022; 13:182-191. [PMID: 35186652 PMCID: PMC8822466 DOI: 10.3762/bjnano.13.13] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
Motivated by the potential role of molybdenum in semiconductor materials, we present a combined theoretical and experimental gas-phase study on dissociative electron attachment (DEA) and dissociative ionization (DI) of Mo(CO)6 in comparison to focused electron beam-induced deposition (FEBID) of this precursor. The DEA and DI experiments are compared to previous work, differences are addressed, and the nature of the underlying resonances leading to the observed DEA processes are discussed in relation to an earlier electron transmission study. Relative contributions of individual ionic species obtained through DEA and DI of Mo(CO)6 and the average CO loss per incident are calculated and compared to the composition of the FEBID deposits produced. These are also compared to gas phase, surface science and deposition studies on W(CO)6 and we hypothesize that reductive ligand loss through electron attachment may promote metal-metal bond formation in the deposition process, leading to further ligand loss and the high metal content observed in FEBID for both these compounds.
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Affiliation(s)
- Po-Yuan Shih
- Carl Zeiss SMT GmbH, Industriestraße 1, 64380 Roßdorf, Germany
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Maicol Cipriani
- Science Institute and Department of Chemistry, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
| | | | - Jens Oster
- Carl Zeiss SMT GmbH, Industriestraße 1, 64380 Roßdorf, Germany
| | - Klaus Edinger
- Carl Zeiss SMT GmbH, Industriestraße 1, 64380 Roßdorf, Germany
| | - Armin Gölzhäuser
- Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
| | - Oddur Ingólfsson
- Science Institute and Department of Chemistry, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
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Ferreira da Silva F, Thorman RM, Bjornsson R, Lu H, McElwee-White L, Ingólfsson O. Dissociation of the FEBID precursor cis-Pt(CO) 2Cl 2 driven by low-energy electrons. Phys Chem Chem Phys 2020; 22:6100-6108. [PMID: 32025665 DOI: 10.1039/c9cp06633k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we present experimental and theoretical results on dissociative electron attachment and dissociative ionisation for the potential FEBID precursor cis-Pt(CO)2Cl2. UHV surface studies have shown that high purity platinum deposits can be obtained from cis-Pt(CO)2Cl2. The efficiency and energetics of ligand removal through these processes are discussed and experimental appearance energies are compared to calculated thermochemical thresholds. The present results demonstrate the potential effectiveness of electron-induced reactions in the deposition of this FEBID precursor, and these are discussed in conjunction with surface science studies on this precursor and the design of new FEBID precursors.
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Affiliation(s)
- Filipe Ferreira da Silva
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.
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Swiderek P, Marbach H, Hagen CW. Chemistry for electron-induced nanofabrication. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2018; 9:1317-1320. [PMID: 29977666 PMCID: PMC6009412 DOI: 10.3762/bjnano.9.124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 03/16/2018] [Indexed: 06/08/2023]
Affiliation(s)
- Petra Swiderek
- University of Bremen, Faculty 2 (Chemistry/Biology), Institute of Applied and Physical Chemistry, Leobener Straße 5, 28334 Bremen, Germany
| | - Hubertus Marbach
- Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany
| | - Cornelis W Hagen
- Department of Imaging Physics, Delft University of Technology, Lorentzweg 1, 2628CJ Delft, The Netherlands
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