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Jin B, Zhou H, Zong Z, Zhang X, Wang G, Zhou L, Chen X. Negative ion formation by neutral hydrogen atom grazing scattering from a LiF(100) surface. RSC Adv 2021; 11:4489-4498. [PMID: 35424408 PMCID: PMC8694513 DOI: 10.1039/d0ra08486g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 12/27/2020] [Indexed: 11/21/2022] Open
Abstract
H− conversion during H0 grazing scattering on a LiF(100) surface, includes H− affinity electron loss to a surface image state.
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Affiliation(s)
- Bo Jin
- School of Nuclear Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
| | - Hu Zhou
- School of Nuclear Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
- College of Chemistry and Chemical Engineering
| | - Zewen Zong
- School of Nuclear Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
| | - Xin Zhang
- School of Nuclear Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
| | - Guangyi Wang
- School of Electronic and Information Engineering
- Lanzhou City University
- Lanzhou 730000
- China
| | - Lihua Zhou
- School of Nuclear Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
| | - Ximeng Chen
- School of Nuclear Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
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Chen L, Qiu S, Xiong F, Lu J, Liu P, Ding B, Li Y, Cui Y, Guo Y, Chen X. Nonadiabatic dynamics in energetic negative fluorine ions scattering from a Si(100) surface. J Chem Phys 2015; 143:114703. [PMID: 26395724 DOI: 10.1063/1.4930908] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The dependence of the negative-ion fractions on incident energy and angle is reported for 8.5-22.5 keV F(-) ions scattered from a Si(100) surface at a fixed scattering angle of 38°. The negative-ion fraction increases monotonically with incident velocity for specular scattering. In particular, the variation of the fraction with incident angle is bell shaped for a given incident energy. We interpret this variation using the incident-velocity effect at short distances where the yield of negative ions depends on the number of initial neutrals. It strongly indicates that at short distances, a dynamical equilibrium population is never achieved. This nonadiabatic feature is supported by simple calculations using modified rate equations.
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Affiliation(s)
- Lin Chen
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Shunli Qiu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Feifei Xiong
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Jianjie Lu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Pinyang Liu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Bin Ding
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Yuan Li
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Ying Cui
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Yanling Guo
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Ximeng Chen
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
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3
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Mao F, Zhang C, Gao CZ, Dai J, Zhang FS. The effects of electron transfer on the energy loss of slow He²⁺, C²⁺, and C⁴⁺ ions penetrating a graphene fragment. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:085402. [PMID: 24504049 DOI: 10.1088/0953-8984/26/8/085402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Electronic energy loss in the collision processes of slow ions with a graphene fragment is investigated by combining ab initio time-dependent density functional theory calculations for electrons with molecular dynamics simulations for ions in real time and real space. We study the electronic energy loss of slow He²⁺, C²⁺, and C⁴⁺ ions penetrating the graphene fragment as a function of the ion velocity, and establish the velocity-proportional energy loss for low-charged ions down to 0.1 a.u. One mechanism clarified in the simulations for electron transfer is polarization capture, which is effective for bare ions at low velocities. The other one is resonance capture, by which the incident ion can capture electrons from the graphene fragment to its electron affinity levels, which have the same, or nearly the same, energy as those of the electron donor levels. The results demonstrate that the nonlinear behavior of energy loss of C⁴⁺ is attributed to the large number of electrons captured by this multi-charged ion during the collision.
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Affiliation(s)
- Fei Mao
- The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, People's Republic of China. Beijing Radiation Center, Beijing 100875, People's Republic of China
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Korytár R, Lorente N. Multi-orbital non-crossing approximation from maximally localized Wannier functions: the Kondo signature of copper phthalocyanine on Ag(100). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:355009. [PMID: 21849718 DOI: 10.1088/0953-8984/23/35/355009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have developed a multi-orbital approach to compute the electronic structure of a quantum impurity using the non-crossing approximation. The calculation starts with a mean-field evaluation of the system's electronic structure using a standard quantum chemistry code; here we use density functional theory (DFT). We transformed the one-electron structure into an impurity Hamiltonian by using maximally localized Wannier functions. Hence, we have developed a method to study the Kondo effect in systems based on an initial one-electron calculation. We have applied our methodology to a copper phthalocyanine molecule chemisorbed on Ag(100), and we have described its spectral function for three different cases where the molecule presents a single spin or two spins with ferro- and anti-ferromagnetic exchange couplings. We find that the use of broken-symmetry mean-field theories such as Kohn-Sham DFT cannot deal with the complexity of the spin of open-shell molecules on metal surfaces and extra modeling is needed.
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Affiliation(s)
- Richard Korytár
- Centro de investigación en nanociencia y nanotecnología (CSIC-ICN), Campus de la UAB, E-08193 Bellaterra, Spain.
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Iglesias-García A, García EA, Goldberg EC. Localized description of surface energy gap effects in the resonant charge exchange between atoms and surfaces. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:045003. [PMID: 21406877 DOI: 10.1088/0953-8984/23/4/045003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The resonant charge exchange between atoms and surfaces is described by considering a localized atomistic view of the solid within the Anderson model. The presence of a surface energy gap is treated within a simplified tight-binding model of the solid, and a proper calculation of the Hamiltonian terms based on a LCAO expansion of the solid eigenstates is performed. It is found that interference terms jointly with a surface projected gap maximum at the Γ point and the Fermi level inside it, lead to hybridization widths negligible around the Fermi level. This result can explain experimental observations related to long-lived adsorbate states and anomalous neutral fractions of low energy ions in alkali/Cu(111) systems.
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Affiliation(s)
- A Iglesias-García
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC-CONICET-UNL), Güemes 3450, CC91, (S3000GLN) Santa Fe, Argentina.
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Bundaleski N, Khemliche H, Soulisse P, Roncin P. Grazing incidence diffraction of keV helium atoms on a Ag(110) surface. PHYSICAL REVIEW LETTERS 2008; 101:177601. [PMID: 18999787 DOI: 10.1103/physrevlett.101.177601] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2008] [Indexed: 05/27/2023]
Abstract
Diffraction of fast atoms at grazing incidence has been recently demonstrated on the surface of alkali halides and wide band gap semiconductors, opening applications for the online monitoring of surface processes such as growth of ultrathin layers. This Letter reports energy resolved diffraction of helium on Ag(110) metal surface showing that a band gap is not mandatory to restrict the decoherence due to electron-hole pair excitations by the keV projectile. Measurement of the energy loss, which is in the eV range, sheds light on the scattering process.
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Affiliation(s)
- N Bundaleski
- CNRS, Laboratoire des Collisions Atomiques et Moleculaires, UMR 8625, Universite Paris-Sud, Orsay, France
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Chulkov EV, Borisov AG, Gauyacq JP, Sanchez-Portal D, Silkin VM, Zhukov VP, Echenique PM. Electronic Excitations in Metals and at Metal Surfaces. Chem Rev 2006; 106:4160-206. [PMID: 17031983 DOI: 10.1021/cr050166o] [Citation(s) in RCA: 208] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- E V Chulkov
- Departamento de Física de Materiales and Centro Mixto CSIC-UPV/EHU, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, Apdo. 1072, 20080 San Sebastian/Donostia, Basque Country, Spain.
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Kondo SI, Yamada K. Calculation of transition probability for neutralization process of +1 ion based on the Noziéres and Dominicis theory. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2006; 18:5911-5925. [PMID: 21690807 DOI: 10.1088/0953-8984/18/26/011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We investigate the neutralization probability of a +1 ion moving parallel to a metal surface, mainly using the Noziéres and Dominicis theory (ND theory), which was applied to the edge singularities in x-ray absorption and emission spectra in metals. In particular, we focus on the effects due to the sudden disappearance of the image potential in the neutralization process. From the analysis, we found that the neutralization probability is given by [Formula: see text], where D and Γ are the band width and the gamma function. The factor α = 2δ/π-(δ/π)(2) is given by the phase shift (δ: phase shift on Fermi surface), and the energy difference between the initial and final states, Δ, includes the kinetic energy of the ion and various other phenomenological factors. The singularity caused from the sudden disappearance of the image potential enhances or reduces the neutralization probability depending on the symmetry of atomic orbital of the ion. When the ion velocity is too fast to form an image potential, the neutralization process would proceed without the creation of an image potential, accompanying an excitation of a surface plasmon; as a result of plasmon excitation the ion velocity becomes slower than the plasma frequency because of screening effects. In this paper, we apply the ND theory to the case of slow ion motion and discuss the dynamics.
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Affiliation(s)
- Shin-Ichiro Kondo
- Department of Materials Science and Engineering, Nagasaki University, Nagasaki, Japan
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10
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Bandurin Y, Esaulov VA, Guillemot L, Monreal RC. Surface miller index dependence of Auger neutralization of ions on surfaces. PHYSICAL REVIEW LETTERS 2004; 92:017601. [PMID: 14754018 DOI: 10.1103/physrevlett.92.017601] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2003] [Indexed: 05/24/2023]
Abstract
Neutralization of He+ ions in grazing incidence scattering on Ag(111) and Ag(110) surfaces is studied. These measurements reveal the existence of an order of magnitude difference in the probability of ion survival on Ag(110) and Ag(111). The experimental results are discussed in terms of survival from Auger neutralization, whose rates are derived theoretically. Molecular dynamics simulation of scattered ion trajectories is performed and the surviving ion fractions are then calculated using the theoretical Auger neutralization rates, without adjustable parameters. The calculations agree quite well with the experimental data and show that the observed differences in the neutralization probabilities on these surfaces are related to different extensions of the electron density beyond the surface, resulting from different atomic packing.
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Affiliation(s)
- Yu Bandurin
- Department of Physics, University of Uzhgorod, Uzhgorod, Ukraine
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Charge Exchange Processes in Low Energy Ion–Metal Collisions. ADVANCES IN QUANTUM CHEMISTRY 2004. [DOI: 10.1016/s0065-3276(04)45008-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
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12
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Hecht T, Winter H, Borisov AG, Gauyacq JP, Kazansky AK. Role of the 2D surface state continuum and projected band gap in charge transfer in front of a Cu(111) surface. PHYSICAL REVIEW LETTERS 2000; 84:2517-2520. [PMID: 11018924 DOI: 10.1103/physrevlett.84.2517] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/1999] [Indexed: 05/23/2023]
Abstract
Electron capture by Li+ and H projectiles in grazing scattering from Cu(111) and Cu(110) surfaces is studied experimentally and theoretically. Whereas data for Cu(110) can be described by established theoretical methods treating resonant charge transfer with a free-electron metal, data for Cu(111) show pronounced deviations from this approach. We interpret our observations by the effect of the projected L-band gap of the Cu(111) surface. In particular, the quantum states of reduced dimension (2D surface state continuum) play a dominant role in electron transfer.
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Affiliation(s)
- T Hecht
- Institut fur Physik, Humboldt-Universitat zu Berlin, Invalidenstrasse 110, D-10115 Berlin, Germany
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Houssiau L, Rabalais JW, Wolfgang J, Nordlander P. Trajectory dependence of scattered Ne+ and recoiled S− ion fractions from the Cd- and S-terminated CdS{0001} surfaces. J Chem Phys 1999. [DOI: 10.1063/1.478716] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Borisov AG, Teillet-Billy D, Gauyacq JP, Winter H, Dierkes G. Resonant charge transfer in grazing scattering of alkali-metal ions from an Al(111) surface. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:17166-17174. [PMID: 9985852 DOI: 10.1103/physrevb.54.17166] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Maazouz M, Guillemot L, Lacombe S, Esaulov VA. Electron Capture Processes on Oxidized Surfaces: H- Formation on Mg/O2 and Al/O2. PHYSICAL REVIEW LETTERS 1996; 77:4265-4268. [PMID: 10062490 DOI: 10.1103/physrevlett.77.4265] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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16
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Merino J, Lorente N, Pou P, Flores F. Charge transfer for slow H atoms interacting with Al: Atomic levels and linewidths. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:10959-10969. [PMID: 9984895 DOI: 10.1103/physrevb.54.10959] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Shao H, Nordlander P, Langreth DC. Probing the Highly Correlated Mixed-Valent State via Charge Transfer with Atoms Moving Out from a Surface. PHYSICAL REVIEW LETTERS 1996; 77:948-951. [PMID: 10062947 DOI: 10.1103/physrevlett.77.948] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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18
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Lorente N, Monreal R. Multielectron neutralization channels in ion-surface scattering. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:9622-9625. [PMID: 9982516 DOI: 10.1103/physrevb.53.9622] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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19
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Joyes P, Tarento R. Dynamical screening effects in surface ionization: Application to C60. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:11242-11247. [PMID: 9982699 DOI: 10.1103/physrevb.53.11242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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20
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Djamo V, Teillet-Billy D, Gauyacq JP. Low-energy electron scattering by N2 molecules physisorbed on Ag: Study of the resonant vibrational excitation process. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:5418-5428. [PMID: 9979423 DOI: 10.1103/physrevb.51.5418] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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21
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van Slooten U, Teodoro O, Kleyn A, Los J, Teillet-Billy D, Gauyacq J. Negative ion formation in proton scattering from Ba/Ag(111). Chem Phys 1994. [DOI: 10.1016/0301-0104(93)e0373-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Djamo V, Teillet-Billy D, Gauyacq JP. Resonant vibrational excitation of adsorbed molecules by electron impact. PHYSICAL REVIEW LETTERS 1993; 71:3267-3270. [PMID: 10054930 DOI: 10.1103/physrevlett.71.3267] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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23
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Hübner W, Falicov LM. Theory of spin-polarized electron-capture spectroscopy in ferromagnetic nickel. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:8783-8793. [PMID: 10004923 DOI: 10.1103/physrevb.47.8783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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