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3 article(s) from P, Ragesh Kumar T

Electron interactions with the heteronuclear carbonyl precursor H₂FeRu₃(CO)₁₃ and comparison with HFeCo₃(CO)₁₂: from fundamental gas phase and surface science studies to focused electron beam induced deposition

Ragesh Kumar T P,
Paul Weirich,
Lukas Hrachowina,
Marc Hanefeld,
Ragnar Bjornsson,
Helgi Rafn Hrodmarsson,
Sven Barth,
D. Howard Fairbrother,
Michael Huth and
Oddur Ingólfsson

Beilstein J. Nanotechnol. 2018, 9, 555–579, doi:10.3762/bjnano.9.53

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Figure 1: Structural arrangement of HFeCo₃(CO)₁₂ and H₂FeRu₃(CO)₁₃ illustrating differences in symmetry and l...

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Figure 2: Isotope distribution of a) HFeCo₃(CO)₁₂ and b) H₂FeRu₃(CO)₁₃. Isotope distribution for both compoun...

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Figure 3: Negative ion yield curves for the formation of a) [Fe(CO)_n]⁻ and b) [Ru(CO)_n]⁻ up on electron attac...

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Figure 4: Loss of Fe(CO)₂ (panel a), Fe(CO)₃ (panel b), Fe(CO)₄ (panel c) and additional loss of up to 7 COs ...

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Figure 5: Negative ions formed through loss of Ru(CO)₃ (panel a), Ru(CO)₄ (panel b) and further loss of up to...

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Figure 6: Calculated spin density of the [H₂FeRu₃(CO)₁₃]⁻ anion; a) in the constrained geometry of neutral H₂...

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Figure 7: Calculated MO diagrams of H₂FeRu₃(CO)₁₃ and HFeCo₃(CO)₁₂. Red lines represent the unoccupied molecu...

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Figure 8: Electron impact ionization spectra of H₂FeRu₃(CO)₁₃ recorded at electron energy of 70 eV, upper pan...

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Figure 9: Evolution of O 1s, Fe 2p and Ru 3d/C 1s XPS regions of a H₂FeRu₃(CO)₁₃ film exposed to electron dos...

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Figure 10: Change in fractional coverage of oxygen atoms (red stars) and, Ru 3d_5/2 peak position (blue open ci...

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Figure 11: Mass spectrum of neutral gas phase species desorbed from an H₂FeRu₃(CO)₁₃ film during the course of...

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Figure 12: Changes in O 1s, Fe 2p and Ru 3d/C 1s XPS regions when an H₂FeRu₃(CO)₁₃ film was exposed to electro...

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Figure 13: Initial decomposition/deposition of surface adsorbed H₂FeRu₃(CO)₁₃ precursor, mediated by dissociat...

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Figure 14: Schematic showing the incorporation of partially decarbonylated intermediate of H₂FeRu₃(CO)₁₃ into ...

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Figure 15: (a) AFM cross sections of deposits shown in the SEM micrograph (b) at the positions indicated by th...

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Figure 16: Transport measurements of as-grown Fe–Ru deposit and deposits grown under identical conditions afte...

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Full Research Paper

Published 14 Feb 2018

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Electron beam induced deposition of silacyclohexane and dichlorosilacyclohexane: the role of dissociative ionization and dissociative electron attachment in the deposition process

Ragesh Kumar T P,
Sangeetha Hari,
Krishna K Damodaran,
Oddur Ingólfsson and
Cornelis W. Hagen

Beilstein J. Nanotechnol. 2017, 8, 2376–2388, doi:10.3762/bjnano.8.237

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Figure 1: Molecular structure of (a) 1,1-dichloro-1-silacyclohexane (cyclo-C₅H₁₀SiCl₂) and (b) silacyclohexan...

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Figure 2: Negative ion yield curve for the principal fragments formed by the electron attachment dissociation...

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Figure 3: Positive ion mass spectra of (a) DCSCH and (b) SCH, both spectra are recorded at an electron impact...

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Figure 4: Pillars grown by EBID from the precursors DCSCH (left) and SCH (right). The precursor pressure was ...

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Figure 5: Measured (a) pillar base diameter, (b) pillar height and (c) heights of the cone-shaped upper part ...

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Figure 6: (a) Pillar volume determined from the measured pillar diameter, pillar height, tip cone height and ...

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Figure 7: a) Schematic showing the order of pillar deposition in a circular array around a central dot; b) sc...

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Figure 8: Tilted (45°) and normal view of two sets of nine closely spaced pillars deposited in a circular arr...

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Figure 9: Square arrays of pillars deposited with the indicated beam exposure time and neighbouring pillar di...

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Figure 10: Monte Carlo simulation of the angular distribution of electrons emitted from a flat Si substrate wi...

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Full Research Paper

Published 10 Nov 2017

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The role of low-energy electrons in focused electron beam induced deposition: four case studies of representative precursors

Rachel M. Thorman,
Ragesh Kumar T. P.,
D. Howard Fairbrother and
Oddur Ingólfsson

Beilstein J. Nanotechnol. 2015, 6, 1904–1926, doi:10.3762/bjnano.6.194

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Figure 1: Schematic representation of the FEBID process (reproduced with permission from [2], Copyright (2008) A...

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Figure 2: Schematic representation of elastic and inelastic scattering of high-energy primary electrons impin...

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Figure 3: Experimentally measured SE spectra from Ni(111) [6] irradiated by PEs with 400 eV impact energy (black...

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Figure 4: Simplified two-dimensional potential energy diagram for quasi-diatomic dissociation through electro...

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Figure 5: Simplified two-dimensional potential energy diagram for a quasi-diatomic dissociation through elect...

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Figure 6: Simplified two-dimensional potential energy diagram for a quasi-diatomic dissociation through elect...

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Figure 7: Energy-dependent relative cross sections (ion yields) of negative ion fragments produced by DEA to ...

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Figure 8: Positive ion mass spectrum of MeCpPtMe₃ recorded with electron energy of 100 eV (reproduced with pe...

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Figure 9: Positive ion mass spectra of MeCpPtMe₃ in the m/z range of 0–85 (reproduced with permission from Wn...

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Figure 10: Changes in the C/Pt ratio of a 3.16 nm thick film of MeCpPtMe₃ adsorbed on a gold surface at 180 K ...

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Figure 11: a) A line of best fit to the cross section for methane desorption from MeCpPtMe₃ adsorbed on a gold...

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Figure 12: Energy-dependent absolute cross sections for negative ion fragments produced by DEA to Pt(PF₃)₄ (re...

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Figure 13: Electron ionization FT-ICR mass spectrum of Pt(PF₃)₄ recorded at 20 eV incident electron energy (re...

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Figure 14: (a) Electron energy loss spectra of Pt(PF₃)₄ recorded at 0° angle with varying residual energies. T...

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Figure 15: Time-resolved mass spectra of gas phase PF₃ (positive [PF₂]⁺ ions produced by 70 eV electron impact...

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Figure 16: Electron dose dependence of the fractional coverage of Phosphorous (P/P_D=0), Fluorine (F/F_D=0) and ...

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Figure 17: Energy-dependent absolute DEA cross sections for Co(CO)₃NO (reproduced with permission from [10], Copyr...

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Figure 18: Energy dependence of the partial cross sections for positive ion fragments formed from Co(CO)₃NO (r...

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Figure 19: The partial cross sections for single CO loss through DEA (red solid line), for single CO loss thro...

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Figure 20: Predicted relative effective damage yield for single CO loss through DEA (red solid line), for sing...

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Figure 21: Positive ion (DI) mass spectra of (a) gas phase Co(CO)₃NO, (b) volatile species desorbing from a 2....

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Figure 22: Electron dose dependence of the fractional coverage of carbon, oxygen and nitrogen from Co(CO)₃NO a...

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Review

Published 16 Sep 2015

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Electron interactions with the heteronuclear carbonyl precursor H2FeRu3(CO)13 and comparison with HFeCo3(CO)12: from fundamental gas phase and surface science studies to focused electron beam induced deposition

Electron beam induced deposition of silacyclohexane and dichlorosilacyclohexane: the role of dissociative ionization and dissociative electron attachment in the deposition process

The role of low-energy electrons in focused electron beam induced deposition: four case studies of representative precursors

Electron interactions with the heteronuclear carbonyl precursor H₂FeRu₃(CO)₁₃ and comparison with HFeCo₃(CO)₁₂: from fundamental gas phase and surface science studies to focused electron beam induced deposition