1
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Wang X, Geng N, de Villa K, Militzer B, Zurek E. Superconductivity in Dilute Hydrides of Ammonia under Pressure. J Phys Chem Lett 2024; 15:5947-5953. [PMID: 38810233 DOI: 10.1021/acs.jpclett.4c01223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2024]
Abstract
The past decade has witnessed great progress in predicting and synthesizing polyhydrides that exhibit superconductivity under pressure. Dopants allow these compounds to become metals at pressures lower than those required to metallize elemental hydrogen. Here, we show that by combining the fundamental planetary building blocks of molecular hydrogen and ammonia, conventional superconducting compounds can be formed at high pressure. Through extensive theoretical calculations, we predict metallic metastable structures with NHn (n = 10, 11, 24) stoichiometries that are based on NH4+ superalkali cations and complex hydrogenic lattices. The hydrogen atoms in the molecular cation contribute to the superconducting mechanism, and the estimated superconducting critical temperatures, Tc's, are comparable to the highest values computed for the alkali metal polyhydrides. The largest calculated (isotropic Eliashberg) Tc is ∼180 K for Pnma-NH10 at 300 GPa. Our results suggest that other molecular cations can be mixed with hydrogen under pressure, yielding superconducting compounds.
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Affiliation(s)
- Xiaoyu Wang
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260, United States
| | - Nisha Geng
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260, United States
| | - Kyla de Villa
- Department of Earth and Planetary Science, University of California, Berkeley, California 94720, United States
| | - Burkhard Militzer
- Department of Earth and Planetary Science, University of California, Berkeley, California 94720, United States
- Department of Astronomy, University of California, Berkeley, California 94720, United States
| | - Eva Zurek
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260, United States
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2
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Szabó P, Gustafsson M. Polyatomic radiative association by quasiclassical trajectory calculations: Formation of HCN and HNC molecules in H + CN collisions. J Chem Phys 2023; 159:144112. [PMID: 37831719 DOI: 10.1063/5.0170577] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 08/21/2023] [Indexed: 10/15/2023] Open
Abstract
We have developed the polyatomic extension of the established [M. Gustafsson, J. Chem. Phys. 138, 074308 (2013)] classical theory of radiative association in the absence of electronic transitions. The cross section and the emission spectrum of the process is calculated by a quasiclassical trajectory method combined with the classical Larmor formula which can provide the radiated power in collisions. We have also proposed a Monte Carlo scheme for efficient computation of ro-vibrationally quantum state resolved cross sections for radiative association. Besides the method development, the global potential energy and dipole surfaces for H + CN collisions have been calculated and fitted to test our polyatomic semiclassical method.
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Affiliation(s)
- Péter Szabó
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
- Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Avenue Circulaire 3, 1180 Brussels, Belgium
- Applied Physics, Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
| | - Magnus Gustafsson
- Applied Physics, Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
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3
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Jaquet R, Lesiuk M. Analysis of QED and non-adiabaticity effects on the rovibrational spectrum of H 3 + using geometry-dependent effective nuclear masses. J Chem Phys 2020; 152:104109. [PMID: 32171219 DOI: 10.1063/1.5144293] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The influence of QED effects (including one- and two-electron Lamb-shift, Araki-Sucher term, one-loop self-energy, and finite nuclear size correction) together with non-adiabatic effects on the rovibrational bound states of H3 + has been investigated. Non-adiabaticity is modeled by using geometry-dependent effective nuclear masses together with only one single potential energy surface. In conclusion, for rovibrational states below 20 000 cm-1, QED and relativistic effects do nearly compensate, and a potential energy surface based on Born-Oppenheimer energies and diagonal adiabatic corrections has nearly the same quality as the one including relativity with QED; the deviations between the two approaches for individual rovibrational states are mostly below 0.02 cm-1. The inclusion of non-adiabatic effects is important, and it reduces deviations from experiments mostly below 0.1 cm-1.
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Affiliation(s)
- Ralph Jaquet
- Theoretical Chemistry, Siegen University, Siegen, Germany
| | - Michal Lesiuk
- Faculty of Chemistry, University of Warsaw, Warsaw, Poland
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4
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Głaz W, Haskopoulos A, Maroulis G, Bancewicz T. Modeling of interaction induced polarizability of H 2-H, numerical analysis. J Chem Phys 2019; 151:014111. [DOI: 10.1063/1.5100265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Waldemar Głaz
- Nonlinear Optics Division, Faculty of Physics, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 2, 61-680 Poznań, Poland
| | | | - George Maroulis
- Department of Chemistry, University of Patras, GR-26500 Patras, Greece
| | - Tadeusz Bancewicz
- Nonlinear Optics Division, Faculty of Physics, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 2, 61-680 Poznań, Poland
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5
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Kohno BH, Mallory JD, Mandelshtam VA. Magic numbers, quantum delocalization, and orientational disordering in anionic hydrogen and deuterium clusters. J Chem Phys 2019; 150:204305. [PMID: 31153193 DOI: 10.1063/1.5099255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The Diffusion Monte Carlo (DMC) method was applied to anionic hydrogen clusters H-(H2)n (n = 1-16, 32) and their deuterated analogs using a polarizable all-atom potential energy surface (PES) developed by Calvo and Yurtsever. For the hydrogen clusters, the binding energy ΔEn appears to be a smooth function of the cluster size n, thus contradicting the previous claim that n = 12 is a "magic number" cluster. The structures of the low energy minima of the PES for these clusters belong to the icosahedral motif with the H2 molecules aligned toward the central H- ion. However, their ground state wavefunctions are highly delocalized and resemble neither the structures of the global nor local minima. Moreover, the strong nuclear quantum effects result in a nearly complete orientational disordering of the H2 molecules. For the deuterium clusters, the ground state wavefunctions are localized and the D2 molecules are aligned toward the central D- ion. However, their structures are still characterized as disordered and, as such, do not display size sensitivity. In addition, DMC simulations were performed on the mixed H-(H2)n(D2)p clusters with (n, p) = (6, 6) and (16, 16). Again, in contradiction to the previous claim, we found that the "more quantum" H2 molecules prefer to reside farther from the central H- ion than the D2 molecules.
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Affiliation(s)
- Bridgett H Kohno
- Department of Chemistry, University of California, Irvine, California 92697, USA
| | - Joel D Mallory
- Department of Chemistry, University of California, Irvine, California 92697, USA
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6
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He X, Li W, Meng H, Li C, Guo G, Qiu X, Wei J. Quantum state-to-state study for (H−(D−),HD) collisions on two potential energy surfaces. Phys Chem Chem Phys 2019; 21:7196-7207. [DOI: 10.1039/c8cp07824f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Revealing the reaction mechanisms of the H−/D− + HD reaction – an exact quantum dynamics study on two potential energy surfaces.
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Affiliation(s)
- Xiaohu He
- Department of Physics
- Taiyuan University of Science and Technology
- Taiyuan
- China
| | - Wenliang Li
- Department of Physics
- Xinjiang Institute of Engineering
- Urumqi
- China
| | - Huiyan Meng
- Department of Physics
- Taiyuan University of Science and Technology
- Taiyuan
- China
| | - Chuanliang Li
- Department of Physics
- Taiyuan University of Science and Technology
- Taiyuan
- China
| | - Guqing Guo
- Department of Physics
- Taiyuan University of Science and Technology
- Taiyuan
- China
| | - Xuanbing Qiu
- Department of Physics
- Taiyuan University of Science and Technology
- Taiyuan
- China
| | - Jilin Wei
- Department of Physics
- Taiyuan University of Science and Technology
- Taiyuan
- China
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7
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Spieler S, Dinu DF, Jusko P, Bastian B, Simpson M, Podewitz M, Liedl KR, Schlemmer S, Brünken S, Wester R. Low frequency vibrational anharmonicity and nuclear spin effects of Cl -(H 2) and Cl -(D 2). J Chem Phys 2018; 149:174310. [PMID: 30409015 DOI: 10.1063/1.5049680] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Low frequency combination bands of 35Cl-(H2) and 35Cl-(D2) have been measured in the region between 600 and 1100 cm-1 by infrared predissociation spectroscopy in a cryogenic 22-pole ion trap using a free electron laser at the FELIX Laboratory as a tunable light source. The 35Cl-(H2) (35Cl-(D2)) spectrum contains three bands at 773 cm-1 (620 cm-1), 889 cm-1 (692 cm-1), and 978 cm-1 (750 cm-1) with decreasing intensity toward higher photon energies. Comparison of the experimentally determined transition frequencies with anharmonic vibrational self-consistent field and vibrational configuration interaction calculations suggests the assignment of the combination bands v1 + v2, 2v1 + v2, and 3v1 + v2 for 35Cl-(H2) and 2v1 + v2, 3v1 + v2, and 4v1 + v2 for 35Cl-(D2), where v1 is the 35Cl-⋯H2 stretching fundamental and v2 is the Cl-(H2) bend. The observed asymmetric temperature dependent line shape of the v1 + v2 transition can be modeled by a series of ∑+-∏ ro-vibrational transitions, when substantially decreasing the rotational constant in the vibrationally excited state by 35%. The spectrum of 35Cl-(D2) shows a splitting of 7 cm-1 for the strongest band which can be attributed to the tunneling of the ortho/para states of D2.
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Affiliation(s)
- Steffen Spieler
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
| | - Dennis F Dinu
- Institut für Allgemeine, Anorganische und Theoretische Chemie, und Center for Molecular Biosciences Innsbruck (CMBI), Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria
| | - Pavol Jusko
- Institut de Recherche en Astrophysique et Planétologie (IRAP), Université de Toulouse (UPS), CNRS, CNES, 9 Av. du Colonel Roche, 31028 Toulouse Cedex 4, France
| | - Björn Bastian
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
| | - Malcolm Simpson
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
| | - Maren Podewitz
- Institut für Allgemeine, Anorganische und Theoretische Chemie, und Center for Molecular Biosciences Innsbruck (CMBI), Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria
| | - Klaus R Liedl
- Institut für Allgemeine, Anorganische und Theoretische Chemie, und Center for Molecular Biosciences Innsbruck (CMBI), Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria
| | - Stephan Schlemmer
- I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
| | - Sandra Brünken
- Institute for Molecules and Materials, FELIX Laboratory, Radboud University, Toernooiveld 7c, 6525 ED Nijmegen, The Netherlands
| | - Roland Wester
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
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8
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Jaquet R, Khoma MV. Investigation of non-adiabatic effects for the ro-vibrational spectrum of H3+: the use of a single potential energy surface with geometry-dependent nuclear masses. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1464225] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Ralph Jaquet
- Theoretische Chemie, Universität Siegen , Siegen, Germany
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9
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Calvo F, Yurtsever E. The quantum structure of anionic hydrogen clusters. J Chem Phys 2018; 148:102305. [DOI: 10.1063/1.4990612] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Affiliation(s)
- F. Calvo
- University Grenoble Alpes, LIPHY, F-38000 Grenoble, France and CNRS, LIPHY, F-38000 Grenoble, France
| | - E. Yurtsever
- Koç University, Rumelifeneriyolu, Sariyer, Istanbul 34450, Turkey
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10
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Belyaev AK, Tiukanov AS, Toropkin AI, Alexandrovich OV. Electron detachment of hydrogen anion in collisions with hydrogen molecule studied by surface hopping classical trajectory calculations. J Chem Phys 2017; 147:234301. [DOI: 10.1063/1.5000718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- A. K. Belyaev
- Department of Theoretical Physics and Astronomy, Herzen University, Moika 48, St. Petersburg 191186, Russia
| | - A. S. Tiukanov
- Department of Theoretical Physics and Astronomy, Herzen University, Moika 48, St. Petersburg 191186, Russia
| | - A. I. Toropkin
- Department of Theoretical Physics and Astronomy, Herzen University, Moika 48, St. Petersburg 191186, Russia
| | - O. V. Alexandrovich
- Department of Theoretical Physics and Astronomy, Herzen University, Moika 48, St. Petersburg 191186, Russia
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11
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Jaquet R, Khoma MV. Investigation of Nonadiabatic Effects for the Vibrational Spectrum of a Triatomic Molecule: The Use of a Single Potential Energy Surface with Distance-Dependent Masses for H 3. J Phys Chem A 2017; 121:7016-7030. [PMID: 28820589 DOI: 10.1021/acs.jpca.7b04703] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
On the basis of first-principles, the influence of nonadiabatic effects on the vibrational bound states of H3+ has been investigated using distance-dependent reduced masses and only one single potential energy surface. For these new vibrational calculations, potentials based on explicitly correlated wave functions are used where, in addition, adiabatic corrections and relativistic contributions are taken into account. For the first time, several different fully distance-dependent reduced mass surfaces in three dimensions have been incorporated in the vibrational calculations.
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Affiliation(s)
- Ralph Jaquet
- Theoretische Chemie, Universität Siegen , D-57068 Siegen, Germany
| | - Mykhaylo V Khoma
- Theoretische Chemie, Universität Siegen , D-57068 Siegen, Germany
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12
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Renzler M, Kuhn M, Mauracher A, Lindinger A, Scheier P, Ellis AM. Anionic Hydrogen Cluster Ions as a New Form of Condensed Hydrogen. PHYSICAL REVIEW LETTERS 2016; 117:273001. [PMID: 28084770 DOI: 10.1103/physrevlett.117.273001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Indexed: 06/06/2023]
Abstract
We report the first experimental observation of negatively charged hydrogen and deuterium cluster ions, H_{n}^{-} and D_{n}^{-}, where n≥5. These anions are formed by an electron addition to liquid helium nanodroplets doped with molecular hydrogen or deuterium. The ions are stable for at least the lifetime of the experiment, which is several tens of microseconds. Only anions with odd values of n are detected, and some specific ions show anomalously high abundances. The sizes of these "magic number" ions suggest an icosahedral framework of H_{2} (D_{2}) molecules in solvent shells around a central H^{-} (D^{-}) ion. The first three shells, which contain a total of 44 H_{2} or D_{2} molecules, appear to be solidlike, but thereafter a more liquidlike arrangement of the H_{2} (D_{2}) molecules is adopted.
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Affiliation(s)
- Michael Renzler
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
| | - Martin Kuhn
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
| | - Andreas Mauracher
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
| | - Albrecht Lindinger
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Paul Scheier
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
| | - Andrew M Ellis
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
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13
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Teplukhin A, Babikov D. Efficient method for calculations of ro-vibrational states in triatomic molecules near dissociation threshold: Application to ozone. J Chem Phys 2016. [DOI: 10.1063/1.4962914] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Alexander Teplukhin
- Department of Chemistry, Wehr Chemistry Building, Marquette University, Milwaukee, Wisconsin 53201-1881, USA
| | - Dmitri Babikov
- Department of Chemistry, Wehr Chemistry Building, Marquette University, Milwaukee, Wisconsin 53201-1881, USA
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14
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Struzhkin VV, Kim DY, Stavrou E, Muramatsu T, Mao HK, Pickard CJ, Needs RJ, Prakapenka VB, Goncharov AF. Synthesis of sodium polyhydrides at high pressures. Nat Commun 2016; 7:12267. [PMID: 27464650 PMCID: PMC4974473 DOI: 10.1038/ncomms12267] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 06/17/2016] [Indexed: 11/09/2022] Open
Abstract
The only known compound of sodium and hydrogen is archetypal ionic NaH. Application of high pressure is known to promote states with higher atomic coordination, but extensive searches for polyhydrides with unusual stoichiometry have had only limited success in spite of several theoretical predictions. Here we report the first observation of the formation of polyhydrides of Na (NaH3 and NaH7) above 40 GPa and 2,000 K. We combine synchrotron X-ray diffraction and Raman spectroscopy in a laser-heated diamond anvil cell and theoretical random structure searching, which both agree on the stable structures and compositions. Our results support the formation of multicenter bonding in a material with unusual stoichiometry. These results are applicable to the design of new energetic solids and high-temperature superconductors based on hydrogen-rich materials. The only known compound of sodium and hydrogen is ionic NaH, but theory predicts the existence of polyhydrides at high pressure. Here, the authors report observations of the formation of polyhydrides above 40 GPa and 2000 K, supporting the idea of multicentre bonding in a material with unusual stoichiometry.
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Affiliation(s)
- Viktor V Struzhkin
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, USA
| | - Duck Young Kim
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, USA.,Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Elissaios Stavrou
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, USA.,Lawrence Livermore National Laboratory, Material Sciences Division, 7000 East Avenue, L-350, Livermore, CA 94550-9698, USA
| | - Takaki Muramatsu
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, USA
| | - Ho-Kwang Mao
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, USA.,Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Chris J Pickard
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.,Department of Materials Science &Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK
| | - Richard J Needs
- Theory of Condensed Matter Group, Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, UK
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, USA
| | - Alexander F Goncharov
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, USA.,Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
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15
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16
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Spooner J, Yanciw B, Wiebe B, Weinberg N. Reaction Profiles and Energy Surfaces of Compressed Species. J Phys Chem A 2014; 118:765-77. [DOI: 10.1021/jp410496t] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jacob Spooner
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - Brandon Yanciw
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - Brandon Wiebe
- Department of Chemistry, University of the Fraser Valley, Abbotsford, BC V2S 7M8, Canada
| | - Noham Weinberg
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
- Department of Chemistry, University of the Fraser Valley, Abbotsford, BC V2S 7M8, Canada
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17
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Jungen M, Lehner M. Feshbach resonances of the H−3and D−3anions. Mol Phys 2013. [DOI: 10.1080/00268976.2013.798043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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18
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Ayouz M, Dulieu O, Robert J. Resonant States of the H3– Molecule and Its Isotopologues D2H– and H2D–. J Phys Chem A 2013; 117:9941-9. [DOI: 10.1021/jp4000279] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. Ayouz
- Laboratoire
de Génie des Procédés et Matériaux, Ecole Centrale de Paris, Bât. Dumas, 92295 Châtenay-Malabry
Cedex, France
| | - O. Dulieu
- Laboratoire
Aimé Cotton, CNRS/Univ Paris-Sud/ENS Cachan, Bât. 505, Campus d’Orsay, 91405 Orsay Cedex, France
| | - J. Robert
- Laboratoire
Aimé Cotton, CNRS/Univ Paris-Sud/ENS Cachan, Bât. 505, Campus d’Orsay, 91405 Orsay Cedex, France
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19
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Wang D, Jaquet R. Reactive Scattering for Different Isotopologues of the H3– System: Comparison of Different Potential Energy Surfaces. J Phys Chem A 2013; 117:7492-501. [DOI: 10.1021/jp401608s] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dequan Wang
- Theoretische Chemie, Universität Siegen, D-57068 Siegen, Germany
| | - Ralph Jaquet
- Theoretische Chemie, Universität Siegen, D-57068 Siegen, Germany
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20
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Shamp A, Hooper J, Zurek E. Compressed cesium polyhydrides: Cs+ sublattices and H3(-) three-connected nets. Inorg Chem 2012; 51:9333-42. [PMID: 22897718 DOI: 10.1021/ic301045v] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The cesium polyhydrides (CsH(n), n > 1) are predicted to become stable, with respect to decomposition into CsH and H2, at pressures as low as 2 GPa. The CsH3 stoichiometry is found to have the lowest enthalpy of formation from CsH and H2 between 30 and 200 GPa. Evolutionary algorithms predict five distinct, mechanically stable, nearly isoenthalpic CsH3 phases consisting of H3(–) molecules and Cs+ atoms. The H3(–) sublattices in two of these adopt a hexagonal three-connected net; in the other three the net is twisted, like the silicon sublattice in the α-ThSi2 structure. The former emerge as being metallic below 100 GPa in our screened hybrid density functional theory calculations, whereas the latter remain insulating up to pressures greater than 250 GPa. The Cs+ cations in the most-stable I4(1)/amd CsH3 phase adopt the positions of the Cs atoms in Cs-IV, and the H3(–) molecules are found in the (interstitial) regions which display a maximum in the electron density.
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Affiliation(s)
- Andrew Shamp
- Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States
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21
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Ayouz M, Mikhailov I, Babikov D, Raoult M, Galtier S, Dulieu O, Kokoouline V. Potential energy and dipole moment surfaces of HCO- for the search of H- in the interstellar medium. J Chem Phys 2012; 136:224310. [PMID: 22713050 DOI: 10.1063/1.4724096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Potential energy and permanent dipole moment surfaces of the electronic ground state of formyl negative ion HCO(-) are determined for a large number of geometries using the coupled-cluster theory with single and double and perturbative treatment of triple excitations ab initio method with a large basis set. The obtained data are used to construct interpolated surfaces, which are extended analytically to the region of large separations between CO and H(-) with the multipole expansion approach. We have calculated the energy of the lowest rovibrational levels of HCO(-) that should guide the spectroscopic characterization of HCO(-) in laboratory experiments. The study can also help to detect HCO(-) in the cold and dense regions of the interstellar medium where the anion could be formed through the association of abundant CO with still unobserved H(-).
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Affiliation(s)
- M Ayouz
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, USA
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Belyaev AK, Toropkin AI, Tyukanov AS. Nonadiabatic transitions in collisions of a negative hydrogen ion with a hydrogen molecule. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2012. [DOI: 10.1134/s1990793112020157] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Jaquet R, Khoma MV. A systematic investigation of the ground state potential energy surface of H3+. J Chem Phys 2012; 136:154307. [PMID: 22519326 DOI: 10.1063/1.4704123] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Based on different ab initio electronic structure calculations (CI-R12 and Gaussian Geminals) of the Born-Oppenheimer electronic energy E(BO) of H(3)(+) from high to highest quality, we build up a potential energy surface which represents a highly reliable form of the topology of the whole potential region, locally and globally. We use the CI-R12 method in order to get within reasonable CPU-time a relatively dense grid of energy points. We demonstrate that CI-R12 is good enough to give an accurate surface, i.e., Gaussian Geminals are not absolutely necessary. For different types of potential energy surface fits, we performed variational calculations of all bound vibrational states, including resonances above the dissociation limit, for total angular momentum J = 0. We clarify the differences between different fits of the energy to various functional forms of the potential surface. Small rms-values (<1 cm(-1)) of the fit do not provide precise information about the interpolatory behaviour of the fit functions.
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Affiliation(s)
- Ralph Jaquet
- Theoretische Chemie, Universität Siegen, D-57068 Siegen, Germany.
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Grabowski SJ, Hoffmann R. Stabilizing H3−: Or Are We Stabilizing a Proton? Chemphyschem 2012; 13:2286-8. [DOI: 10.1002/cphc.201200182] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Indexed: 10/28/2022]
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Hooper J, Zurek E. Rubidium polyhydrides under pressure: emergence of the linear H3(-) species. Chemistry 2012; 18:5013-21. [PMID: 22392860 DOI: 10.1002/chem.201103205] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Indexed: 11/12/2022]
Abstract
The structures of compressed rubidium polyhydrides, RbH(n) with n>1, and their evolution under pressure are studied using density functional theory calculations. These phases, which start to stabilize at only P = 2 GPa, consist of Rb(+) cations and one or more of the following species: H(-) anions, H(2) molecules, and H(3)(-) molecules. The latter motif, the simplest example of a three-center four-electron bond, is found in the most stable structures, RbH(5) and RbH(3) , which metallize above 200 GPa. At the highest pressures studied, our evolutionary searches find an RbH(6) phase which contains polymeric (H(3)(-))(∞) chains that show signs of one-dimensional liquid-like behavior.
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Affiliation(s)
- James Hooper
- Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260-3000, USA
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Jordon-Thaden B, Kreckel H, Golser R, Schwalm D, Berg MH, Buhr H, Gnaser H, Grieser M, Heber O, Lange M, Novotný O, Novotny S, Pedersen HB, Petrignani A, Repnow R, Rubinstein H, Shafir D, Wolf A, Zajfman D. Structure and stability of the negative hydrogen molecular ion. PHYSICAL REVIEW LETTERS 2011; 107:193003. [PMID: 22181602 DOI: 10.1103/physrevlett.107.193003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Indexed: 05/31/2023]
Abstract
We present the results of a Coulomb explosion experiment that allows for the imaging of the rovibrational wave function of the metastable H2- ion. Our measurements confirm the predicted large internuclear separation of 6 a.u., and they show that the ion decays by autodetachment rather than by spontaneous dissociation. Imaging of the resulting H2 products reveals a large angular momentum of J = 25 ± 2, quantifying the rotation that leads to the metastability of this most fundamental molecular anion.
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Affiliation(s)
- B Jordon-Thaden
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
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