1
|
Malerz S, Trinter F, Hergenhahn U, Ghrist A, Ali H, Nicolas C, Saak CM, Richter C, Hartweg S, Nahon L, Lee C, Goy C, Neumark DM, Meijer G, Wilkinson I, Winter B, Thürmer S. Low-energy constraints on photoelectron spectra measured from liquid water and aqueous solutions. Phys Chem Chem Phys 2021; 23:8246-8260. [PMID: 33710216 DOI: 10.1039/d1cp00430a] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on the effects of electron collision and indirect ionization processes, occurring at photoexcitation and electron kinetic energies well below 30 eV, on the photoemission spectra of liquid water. We show that the nascent photoelectron spectrum and, hence, the inferred electron binding energy can only be accurately determined if electron energies are large enough that cross sections for quasi-elastic scattering processes, such as vibrational excitation, are negligible. Otherwise, quasi-elastic scattering leads to strong, down-to-few-meV kinetic energy scattering losses from the direct photoelectron features, which manifest in severely distorted intrinsic photoelectron peak shapes. The associated cross-over point from predominant (known) electronically inelastic to quasi-elastic scattering seems to arise at surprisingly large electron kinetic energies, of approximately 10-14 eV. Concomitantly, we present evidence for the onset of indirect, autoionization phenomena (occurring via superexcited states) within a few eV of the primary and secondary ionization thresholds. These processes are inferred to compete with the direct ionization channels and primarily produce low-energy photoelectrons at photon and electron impact excitation energies below ∼15 eV. Our results highlight that vibrational inelastic electron scattering processes and neutral photoexcitation and autoionization channels become increasingly important when photon and electron kinetic energies are decreased towards the ionization threshold. Correspondingly, we show that for neat water and aqueous solutions, great care must be taken when quantitatively analyzing photoelectron spectra measured too close to the ionization threshold. Such care is essential for the accurate determination of solvent and solute ionization energies as well as photoelectron branching ratios and peak magnitudes.
Collapse
Affiliation(s)
- Sebastian Malerz
- Molecular Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
2
|
Artemyev AN, Streltsov AI, Demekhin PV. Controlling Dynamics of Postcollision Interaction. PHYSICAL REVIEW LETTERS 2019; 122:183201. [PMID: 31144868 DOI: 10.1103/physrevlett.122.183201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 03/06/2019] [Indexed: 06/09/2023]
Abstract
A general scheme to get insight and to control postcollision interaction (PCI) by means of sequential double ionization with two high-frequency pulses is discussed. In particular, we propose to consider PCI of a slow photoelectron released by the pump pulse from a neutral atom with a fast photoelectron released by the time-delayed probe pulse from the created ion. This scheme is exemplified by the ab initio calculations performed for the prototypical helium atom. In order to visualize PCI effects in real time and real space, the corresponding time-dependent Schrödinger equation is solved by propagating two-electron wave packets in terms of essential stationary eigenstates of the unperturbed Hamiltonian. It is demonstrated that the exchange of energy between the slow and fast photoelectron wave packets in continuum, as well as the recapture of threshold photoelectrons owing to the PCI, can be controlled by the properties of the ionizing pulses and the time delay between them.
Collapse
Affiliation(s)
- Anton N Artemyev
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - Alexej I Streltsov
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| | - Philipp V Demekhin
- Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
| |
Collapse
|
3
|
Travlou NA, Algarra M, Alcoholado C, Cifuentes-Rueda M, Labella AM, Lázaro-Martínez JM, Rodríguez-Castellón E, Bandosz TJ. Carbon Quantum Dot Surface-Chemistry-Dependent Ag Release Governs the High Antibacterial Activity of Ag-Metal–Organic Framework Composites. ACS APPLIED BIO MATERIALS 2018; 1:693-707. [DOI: 10.1021/acsabm.8b00166] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nikolina A. Travlou
- Department of Chemistry, The City College of New York, New York, New York 10031, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, United States
| | - Manuel Algarra
- CQM-Madeira Chemistry Research Centre. University of Madeira, Campus de Penteada 9020-105, Funchal, Madeira
| | - Cristina Alcoholado
- Centro de Investigaciones Biomédicas en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Manuel Cifuentes-Rueda
- Centro de Investigaciones Biomédicas en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | | | - Juan Manuel Lázaro-Martínez
- Department of Organic Chemistry and IQUIMEFA-CONICET, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, C1113AAD Ciudad Autónoma de Buenos Aires, Argentina
| | | | - Teresa J. Bandosz
- Department of Chemistry, The City College of New York, New York, New York 10031, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, United States
| |
Collapse
|
4
|
Winkler M, Børve KJ. Attenuation of slow (10-40 eV) electrons in soft nanoparticles: Size matters in argon clusters. Phys Rev E 2018; 97:012604. [PMID: 29448394 DOI: 10.1103/physreve.97.012604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Indexed: 06/08/2023]
Abstract
Electron attenuation due to inelastic and elastic scattering in condensed media can often be described in terms of the effective attenuation length (EAL) of the electron. The EAL is thus an important parameter for describing electron transport processes as exemplified by dissipation of energy following radiolysis. Focusing on electrons at low electron kinetic energies (10-40 eV) in condensed argon, we determine EAL from x-ray photoelectron spectra of argon nanoparticles and compare to values obtained from valence ionization in thin argon films as well as from gas-phase electron-scattering data. EAL determined from argon clusters shows variation with cluster size. Moreover, the values are significantly lower than those obtained in valence-ionization studies and from scattering data. Our results corroborate recent x-ray photoelectron spectroscopy-based determination of EALs of water showing large differences to the EALs determined by other methods in amorphous ice at low kinetic energies of the photoelectron [Y.-I. Suzuki, K. Nishizawa, N. Kurahashi, and T. Suzuki, Phys. Rev. E 90, 010302 (2014)PLEEE81539-375510.1103/PhysRevE.90.010302], underlining that care must be taken when using EAL values from other sources for core-level electrons.
Collapse
Affiliation(s)
- Mathias Winkler
- Department of Chemistry, University of Bergen, NO-5007 Bergen, Norway
| | - Knut J Børve
- Department of Chemistry, University of Bergen, NO-5007 Bergen, Norway
| |
Collapse
|
5
|
Han ZK, Wang YG, Gao Y. Catalytic role of vacancy diffusion in ceria supported atomic gold catalyst. Chem Commun (Camb) 2017; 53:9125-9128. [DOI: 10.1039/c7cc04440b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The diffusion of Ov between the surface and subsurface layer is shown to promote the reactivity of CO oxidation
Collapse
Affiliation(s)
- Zhong-Kang Han
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology
- Shanghai Institute of Applied Physics
- Chinese Academy of Sciences
- Shanghai
- 201800 China
| | - Yang-Gang Wang
- Fritz-Haber-Institut der Max-Planck-Gesellschaft
- Berlin-Dahlem
- 14195 Germany
| | - Yi Gao
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology
- Shanghai Institute of Applied Physics
- Chinese Academy of Sciences
- Shanghai
- 201800 China
| |
Collapse
|
6
|
Oka T, Yokoya A, Fujii K, Fukuda Y, Ukai M. Unpaired electron species in thin films of calf-thymus DNA molecules induced by nitrogen and oxygen K-shell photoabsorption. PHYSICAL REVIEW LETTERS 2012; 109:213001. [PMID: 23215591 DOI: 10.1103/physrevlett.109.213001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Revised: 09/05/2012] [Indexed: 06/01/2023]
Abstract
The mechanism of DNA modification induced by K-shell photoabsorption of nitrogen and oxygen atoms was investigated by electron paramagnetic resonance and x-ray absorption near edge structure measurements of calf thymus DNA. A g factor of 2.000 for the unpaired electron species, which only arises during irradiation, was measured. The EPR intensities for DNA zwere twofold times larger than those estimated based on the photoabsorption cross section. This suggests that the DNA film itself forms unpaired electron species through the excitation of enhanced electron recapturing, known as the postcollision interaction process.
Collapse
Affiliation(s)
- T Oka
- Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan.
| | | | | | | | | |
Collapse
|
7
|
Szabová L, Camellone MF, Huang M, Matolín V, Fabris S. Thermodynamic, electronic and structural properties of Cu/CeO2 surfaces and interfaces from first-principles DFT+U calculations. J Chem Phys 2010; 133:234705. [DOI: 10.1063/1.3515424] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
8
|
Peters S, Peredkov S, Balkaya B, Ferretti N, Neeb M, Eberhardt W. Evolution of metallic screening in small metal clusters probed by PCI-Auger spectroscopy. Phys Chem Chem Phys 2010; 12:9867-71. [DOI: 10.1039/c004334f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
9
|
Camellone MF, Fabris S. Reaction Mechanisms for the CO Oxidation on Au/CeO2 Catalysts: Activity of Substitutional Au3+/Au+ Cations and Deactivation of Supported Au+ Adatoms. J Am Chem Soc 2009; 131:10473-83. [PMID: 19722624 DOI: 10.1021/ja902109k] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matteo Farnesi Camellone
- Theory@Elettra Group, INFM-CNR DEMOCRITOS, c/o Sincrotrone Trieste−SS14, Km 163, 5 Basovizza, I-34012 Trieste, Italy, and SISSA Scuola Internazionale Superiore di Studi Avanzati, via Beirut 2-4, I-34014 Trieste, Italy
| | - Stefano Fabris
- Theory@Elettra Group, INFM-CNR DEMOCRITOS, c/o Sincrotrone Trieste−SS14, Km 163, 5 Basovizza, I-34012 Trieste, Italy, and SISSA Scuola Internazionale Superiore di Studi Avanzati, via Beirut 2-4, I-34014 Trieste, Italy
| |
Collapse
|
10
|
Tchaplyguine M, Kivimäki A, Peredkov S, Sorensen SL, Ohrwall G, Schulz J, Lundwall M, Rander T, Lindblad A, Rosso A, Svensson S, Mårtensson N, Björneholm O. Localized versus delocalized excitations just above the 3d threshold in krypton clusters studied by Auger electron spectroscopy. J Chem Phys 2007; 127:124314. [PMID: 17902910 DOI: 10.1063/1.2770460] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present Auger spectroscopy studies of large krypton clusters excited by soft x-ray photons with energies on and just above the 3d(52) ionization threshold. The deexcitation spectra contain new features as compared to the spectra measured both below and far above threshold. Possible origins of these extra features, which stay at constant kinetic energies, are discussed: (1) normal Auger process with a postcollision interaction induced energy shift, (2) recapture of photoelectrons into high Rydberg orbitals after Auger decay, and (3) excitation into the conduction band (or "internal" ionization) followed by Auger decay. The first two schemes are ruled out, hence internal ionization remains the most probable explanation.
Collapse
Affiliation(s)
- M Tchaplyguine
- MAX-lab, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden.
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Lundwall M, Lindblad A, Bergersen H, Rander T, Ohrwall G, Tchaplyguine M, Svensson S, Björneholm O. Preferential site occupancy of krypton atoms on free argon-cluster surfaces. J Chem Phys 2006; 125:014305. [PMID: 16863296 DOI: 10.1063/1.2209677] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Argon clusters have been doped with krypton atoms in a pick-up setup and investigated by means of ultraviolet and x-ray photoelectron spectroscopy (UPS and XPS). The width of the krypton surface feature in the XPS spectra from mixed krypton/argon clusters has been studied and found to be narrower than in the case of homogeneous krypton clusters. By considering known spectral broadening mechanisms of the cluster features and the electron binding energy shift of the cluster surface feature relative to the atomic signal, we conclude that krypton ad-atoms preferentially occupy high-coordination surface sites on the argon host-cluster.
Collapse
Affiliation(s)
- M Lundwall
- Department of Physics, Uppsala University, P.O. Box 530, SE-751 21 Uppsala, Sweden.
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Lindblad A, Bergersen H, Rander T, Lundwall M, Ohrwall G, Tchaplyguine M, Svensson S, Björneholm O. The far from equilibrium structure of argon clusters doped with krypton or xenon. Phys Chem Chem Phys 2006; 8:1899-905. [PMID: 16633676 DOI: 10.1039/b517083d] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Heterogeneous clusters created by doping Ar host clusters with Kr or Xe are shown to have radically different structures from the mixed clusters of the same type created by co-expansion of Ar-Kr or Ar-Xe gas mixtures. In contrast to the co-expansion case, the doped mixed clusters can be produced with Kr or Xe on the surface and Ar in the bulk. With the doping technique it is thus possible to control the surface composition of a specific cluster. A study of the cluster properties as a function of the doping pressure is also reported for the case of Ar clusters doped with Xe. The clusters have been studied by means of synchrotron radiation based X-ray photoelectron spectroscopy.
Collapse
Affiliation(s)
- A Lindblad
- Dept. of Physics, Uppsala University, Box 530, SE-751 21, Uppsala, Sweden.
| | | | | | | | | | | | | | | |
Collapse
|