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Harris RM, Zhu Z, Tufekci BA, Deepika, Jena P, Peterson KA, Bowen KH. Electronic Structure and Anion Photoelectron Spectroscopy of Uranium-Gold Clusters UAu n-, n = 3-7. J Phys Chem A 2023; 127:7186-7197. [PMID: 37590893 DOI: 10.1021/acs.jpca.3c03452] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
A collaborative effort between experiment and theory toward elucidating the electronic and molecular structures of uranium-gold clusters is presented. Anion photoelectron spectra of UAun-(n = 3-7) were taken at the third (355 nm) and fourth (266 nm) harmonics of a Nd:YAG laser, as well as excimer (ArF 193 nm) photon energies, where the experimental adiabatic electron affinities and vertical detachment energies values were measured. Complementary first-principles calculations were subsequently carried out to corroborate experimentally determined electron detachment energies and to determine the geometry and electronic structure for each cluster. Except for the ring-like neutral isomer of UAu6 where one unpaired electron is spread over the Au atoms, all other neutral and anionic UAun clusters (n = 3-7) were calculated to possess open-shell electrons with the unpaired electrons localized on the central U atom. The smaller clusters closely resemble the analogous UFn species, but significant deviations are seen starting with UAu5 where a competition between U-Au and Au-Au bonding begins to become apparent. The UAu6 system appears to mark a transition where Au-Au interactions begin to dominate, where both a ring-like and two heavily distorted octahedral structures around the central U atom are calculated to be nearly isoenergetic. With UAu7, only ring-like structures are calculated. Overall, the calculated electron detachment energies are in good agreement with the experimental values.
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Affiliation(s)
- Rachel M Harris
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Zhaoguo Zhu
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Burak A Tufekci
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Deepika
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Purusottam Jena
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Kirk A Peterson
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Kit H Bowen
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
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2
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Gaona Carranza AM, Garcia Diaz R, Hoat DM, Siqueiros JM, Guerrero-Sanchez J. Predicting the stability and electronic structure of alkali metal aurides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:235901. [PMID: 35276690 DOI: 10.1088/1361-648x/ac5d1a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
Density functional theory calculations of phonon modes predict that some compounds of the alkali metal aurides family, general formulaA2MAu6(A= K, Rb or Cs;M= Ti, Zr, Hf, Sn or Pb), have stable three-dimensional phase with a double perovskite-type structure and cubicFm3¯mspace group (K2PtCl6-type). Bader's charge analysis shows that most electron density is located within the six atoms at the octahedra vertices like double perovskite halides. However, the short spacing between Au anions enables d-orbital interactions between them. Compounds of this family, with group 4 metals only, carry conduction states around the Γ point (k= 0). On the other hand, compounds with group 14 metals possess more conduction states around all the Brillouin zone and have electron pockets in their band structures. These compounds provide further insights into the unusual anionic behavior of gold and present other alternatives for the construction of divergent nanodevices.
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Affiliation(s)
- Axel M Gaona Carranza
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada B. C., 22800, Mexico
| | - Reyes Garcia Diaz
- CONACyT-Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Coahuila, Unidad Camporedondo, Edif. A, 25000, Saltillo, Coahuila, Mexico
| | - D M Hoat
- Institute of Theoretical and Applied Research, Duy Tan University, Ha Noi 100000, Vietnam
- Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam
| | - Jesús M Siqueiros
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada B. C., 22800, Mexico
| | - Jonathan Guerrero-Sanchez
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada B. C., 22800, Mexico
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3
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Wang YS, Nijjar P, Zhou X, Bondar DI, Prezhdo OV. Combining Lindblad Master Equation and Surface Hopping to Evolve Distributions of Quantum Particles. J Phys Chem B 2020; 124:4326-4337. [DOI: 10.1021/acs.jpcb.0c03030] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yi-Siang Wang
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Parmeet Nijjar
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Xin Zhou
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
- College of Environment and Chemical Engineering, Dalian University, Dalian 116622, P. R. China
| | - Denys I. Bondar
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
| | - Oleg V. Prezhdo
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, United States
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Jayachandran P, Angamuthu A, Gopalan P. Quantum Chemical Study on the Structure and Energetics of Binary Ionic Porphyrin Complexes. J CHIN CHEM SOC-TAIP 2018. [DOI: 10.1002/jccs.201700383] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Abiram Angamuthu
- Department of Physics; Karunya Institute of Technology and Sciences; Coimbatore 641114 India
| | - Praveena Gopalan
- Department of Physics; PSGR Krishnammal College for Women; Coimbatore 641004 India
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Lapere KML, McKinley AJ, Wild D. Anion Photoelectron Spectroscopy and High Level Ab Initio Calculations of the Halide–Nitric Oxide Dimer Complexes. Aust J Chem 2018. [DOI: 10.1071/ch17581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Anion photoelectron spectra are presented for gas phase complexes formed between halide anions and nitric oxide, X−⋯NO where X− = Cl−, Br−, and I−. Electron binding energies are experimentally determined to be 3.82, 3.51, and 3.17 eV. Results from CCSD(T)/aug-cc-pVTZ calculations are presented for the anion species, whereby a single minimum of Cs symmetry is predicted. Binding energies (D0) of 15.3, 13.3, and 11.7 kJ mol−1 are predicted from complete basis set limit extrapolation, and are found to be in line with previous experimental studies.
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Zhou X, Jankowska J, Li L, Giri A, Hopkins PE, Prezhdo OV. Strong Influence of Ti Adhesion Layer on Electron-Phonon Relaxation in Thin Gold Films: Ab Initio Nonadiabatic Molecular Dynamics. ACS APPLIED MATERIALS & INTERFACES 2017; 9:43343-43351. [PMID: 29135220 DOI: 10.1021/acsami.7b12535] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Electron-phonon relaxation in thin metal films is an important consideration for many ultrasmall devices and ultrafast applications. Recent time-resolved experiments demonstrate a significant, more than a factor of five, increase in the electron-phonon coupling and acceleration in the electron-phonon relaxation rate when a narrow Ti adhesion layer is introduced between an Au film and a nonmetal substrate. Using nonadiabatic molecular dynamics combined with real-time time-dependent density functional theory, we identify the reasons that give rise to this strong effect. First, the Ti layer greatly enhances the density of states (DOS) in the energy region starting at 1 eV below the Fermi level and extending several electronvolts above it. Second, Ti atoms are four times lighter than Au atoms and therefore generate larger nonadiabatic (NA) electron-phonon coupling. Because the transition rates depend on coupling and DOS, both the factors accelerate the dynamics. Showing good agreement with the experiments, the time-domain atomistic simulations provide a detailed mechanistic understanding of the electron-phonon relaxation dynamics in thin gold films and related nanomaterials.
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Affiliation(s)
- Xin Zhou
- College of Environment and Chemical Engineering, Dalian University , Dalian 116622, P. R. China
| | - Joanna Jankowska
- Institute of Physics, Polish Academy of Sciences , 02-668 Warsaw, Poland
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Todeschini M, Bastos da Silva Fanta A, Jensen F, Wagner JB, Han A. Influence of Ti and Cr Adhesion Layers on Ultrathin Au Films. ACS APPLIED MATERIALS & INTERFACES 2017; 9:37374-37385. [PMID: 28967257 DOI: 10.1021/acsami.7b10136] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Efficient adhesion of gold thin films on dielectric or semiconductor substrates is essential in applications and research within plasmonics, metamaterials, 2D materials, and nanoelectronics. As a consequence of the relentless downscaling in nanoscience and technology, the thicknesses of adhesion layer and overlayer have reached tens of nanometers, and it is unclear if our current understanding is sufficient. In this report, we investigated how Cr and Ti adhesion layers influence the nanostructure of 2-20 nm thin Au films by means of high-resolution electron microscopy, complemented with atomic force microscopy and X-ray photoelectron spectroscopy. Pure Au films were compared to Ti/Au and Cr/Au bilayer systems. Both Ti and Cr had a striking impact on grain size and crystal orientation of the Au overlayer, which we interpret as the adhesion layer-enhanced wetting of Au and the formation of chemical bonds between the layers. Ti formed a uniform layer under the Au overlayer. Cr interdiffused with the Au layer forming a Cr-Au alloy. The crystal orientation of the Au layers was mainly [111] for all thin-film systems. The results showed that both adhesion layers were partially oxidized, and oxidation sources were scrutinized and found. A difference in bilayer electrical resistivity between Ti/Au and Cr/Au systems was measured and compared. On the basis of these results, a revised and more detailed adhesion layer model for both Ti/Au and Cr/Au systems was proposed. Finally, the implications of the results were analyzed, and recommendations for the selection of adhesion layers for nano-optics and nanoelectronics applications are presented.
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Affiliation(s)
- Matteo Todeschini
- DTU Danchip/Cen, Technical University of Denmark , Ørsteds Plads, Building 347, 2800 Kgs. Lyngby, Denmark
| | | | - Flemming Jensen
- DTU Danchip/Cen, Technical University of Denmark , Ørsteds Plads, Building 347, 2800 Kgs. Lyngby, Denmark
| | - Jakob Birkedal Wagner
- DTU Danchip/Cen, Technical University of Denmark , Ørsteds Plads, Building 347, 2800 Kgs. Lyngby, Denmark
| | - Anpan Han
- DTU Danchip/Cen, Technical University of Denmark , Ørsteds Plads, Building 347, 2800 Kgs. Lyngby, Denmark
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Wang P, Zhang W, Xu XL, Yuan J, Xu HG, Zheng W. Gas phase anion photoelectron spectroscopy and theoretical investigation of gold acetylide species. J Chem Phys 2017; 146:194303. [PMID: 28527467 DOI: 10.1063/1.4983304] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
We conducted gas phase anion photoelectron spectroscopy and density functional theory studies on a number of gold acetylide species, such as AuC2H, AuC2Au, and Au2C2H. Based on the photoelectron spectra, the electron affinities of AuC2H, AuC2Au, and Au2C2H are measured to be 1.54(±0.04), 1.60(±0.08), and 4.23(±0.08) eV, respectively. The highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gaps of AuC2H and AuC2Au are measured to be about 2.62 and 2.48 eV, respectively. It is interesting that photoelectron spectra of AuC2H- and AuC2Au- display similar spectral features. The comparison of experimental and theoretical results confirms that the ground-state structures of AuC2H-, AuC2Au-, and their neutrals are all linear with Au-C≡C-H and Au-C≡C-Au configurations. The similar geometric structures, spectral features, HOMO-LUMO gaps, and chemical bonding between AuC2H-/0 and AuC2Au-/0 demonstrate that Au atom behaves like H atom in these species. The photoelectron spectrum of Au2C2H- shows that Au2C2H has a high electron affinity of 4.23(±0.08) eV, indicating Au2C2H is a superhalogen. Further, we found an unusual similarity between the terminal Au atom of Au2C2H- and the iodine atom of IAuC2H-.
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Affiliation(s)
- Peng Wang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wenjing Zhang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xi-Ling Xu
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jinyun Yuan
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Hong-Guang Xu
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Weijun Zheng
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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Lapere KML, Kettner M, Watson PD, McKinley AJ, Wild DA. Halide–Nitrogen Gas-Phase Clusters: Anion Photoelectron Spectroscopy and High Level ab Initio Calculations. J Phys Chem A 2015; 119:9722-8. [DOI: 10.1021/acs.jpca.5b06348] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kim M. L. Lapere
- School
of Chemistry and Biochemistry, The University of Western Australia, Crawley, Western Australia, 6009, Australia
| | - Marcus Kettner
- School
of Chemistry and Biochemistry, The University of Western Australia, Crawley, Western Australia, 6009, Australia
| | - Peter D. Watson
- School
of Chemistry and Biochemistry, The University of Western Australia, Crawley, Western Australia, 6009, Australia
| | - Allan J. McKinley
- School
of Chemistry and Biochemistry, The University of Western Australia, Crawley, Western Australia, 6009, Australia
| | - Duncan A. Wild
- School
of Chemistry and Biochemistry, The University of Western Australia, Crawley, Western Australia, 6009, Australia
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Beckham D, Conran S, Lapere K, Kettner M, McKinley A, Wild D. Anion photoelectron spectroscopy and high level ab initio calculations of the halide–acetylene dimer complexes. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2014.11.058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Lopez GV, Czekner J, Jian T, Li WL, Yang Z, Wang LS. Probing the electronic and vibrational structure of Au2Al2− and Au2Al2 using photoelectron spectroscopy and high resolution photoelectron imaging. J Chem Phys 2014; 141:224309. [DOI: 10.1063/1.4903784] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Gary V. Lopez
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
| | - Joseph Czekner
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
| | - Tian Jian
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
| | - Wei-Li Li
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
| | - Zheng Yang
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
| | - Lai-Sheng Wang
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
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