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Schürmann R, Bald I. Real-time monitoring of plasmon induced dissociative electron transfer to the potential DNA radiosensitizer 8-bromoadenine. NANOSCALE 2017; 9:1951-1955. [PMID: 28098304 DOI: 10.1039/c6nr08695k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The excitation of localized surface plasmons in noble metal nanoparticles (NPs) results in different nanoscale effects such as electric field enhancement, the generation of hot electrons and a temperature increase close to the NP surface. These effects are typically exploited in diverse fields such as surface-enhanced Raman scattering (SERS), NP catalysis and photothermal therapy (PTT). Halogenated nucleobases are applied as radiosensitizers in conventional radiation cancer therapy due to their high reactivity towards secondary electrons. Here, we use SERS to study the transformation of 8-bromoadenine (8BrA) into adenine on the surface of Au and AgNPs upon irradiation with a low-power continuous wave laser at 532, 633 and 785 nm, respectively. The dissociation of 8BrA is ascribed to a hot-electron transfer reaction and the underlying kinetics are carefully explored. The reaction proceeds within seconds or even milliseconds. Similar dissociation reactions might also occur with other electrophilic molecules, which must be considered in the interpretation of respective SERS spectra. Furthermore, we suggest that hot-electron transfer induced dissociation of radiosensitizers such as 8BrA can be applied in the future in PTT to enhance the damage of tumor tissue upon irradiation.
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Affiliation(s)
- R Schürmann
- Institute of Chemistry, Physical Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14776 Potsdam, Germany. and BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, 12489 Berlin, Germany
| | - I Bald
- Institute of Chemistry, Physical Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14776 Potsdam, Germany. and BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, 12489 Berlin, Germany
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2
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Uranga-Piña L, Tremblay JC. Relaxation dynamics in quantum dissipative systems: the microscopic effect of intramolecular vibrational energy redistribution. J Chem Phys 2014; 141:074703. [PMID: 25149802 DOI: 10.1063/1.4892376] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
We investigate the effect of inter-mode coupling on the vibrational relaxation dynamics of molecules in weak dissipative environments. The simulations are performed within the reduced density matrix formalism in the Markovian regime, assuming a Lindblad form for the system-bath interaction. The prototypical two-dimensional model system representing two CO molecules approaching a Cu(100) surface is adapted from an ab initio potential, while the diatom-diatom vibrational coupling strength is systematically varied. In the weak system-bath coupling limit and at low temperatures, only first order non-adiabatic uni-modal coupling terms contribute to surface-mediated vibrational relaxation. Since dissipative dynamics is non-unitary, the choice of representation will affect the evolution of the reduced density matrix. Two alternative representations for computing the relaxation rates and the associated operators are thus compared: the fully coupled spectral basis, and a factorizable ansatz. The former is well-established and serves as a benchmark for the solution of Liouville-von Neumann equation. In the latter, a contracted grid basis of potential-optimized discrete variable representation is tailored to incorporate most of the inter-mode coupling, while the Lindblad operators are represented as tensor products of one-dimensional operators, for consistency. This procedure results in a marked reduction of the grid size and in a much more advantageous scaling of the computational cost with respect to the increase of the dimensionality of the system. The factorizable method is found to provide an accurate description of the dissipative quantum dynamics of the model system, specifically of the time evolution of the state populations and of the probability density distribution of the molecular wave packet. The influence of intra-molecular vibrational energy redistribution appears to be properly taken into account by the new model on the whole range of coupling strengths. It demontrates that most of the mode mixing during relaxation is due to the potential part of the Hamiltonian and not to the coupling among relaxation operators.
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Affiliation(s)
- L Uranga-Piña
- Facultad de Física, Universidad de la Habana, San Lázaro y L, Vedado, 10400 Havana, Cuba
| | - J C Tremblay
- Institute for Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany
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3
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Vaida ME, Bernhardt TM. Surface-Aligned Femtochemistry: Molecular Reaction Dynamics on Oxide Surfaces. SPRINGER SERIES IN CHEMICAL PHYSICS 2014. [DOI: 10.1007/978-3-319-02051-8_10] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
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4
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Füchsel G, Tremblay JC, Klamroth T, Saalfrank P. Selective Excitation of Molecule-Surface Vibrations in H2 and D2 Dissociatively Adsorbed on Ru(0001). Isr J Chem 2012. [DOI: 10.1002/ijch.201100097] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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5
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Tremblay JC, Monturet S, Saalfrank P. The effects of electron-hole pair coupling on the infrared laser-controlled vibrational excitation of NO on Au(111). J Phys Chem A 2011; 115:10698-707. [PMID: 21861512 DOI: 10.1021/jp205902k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work, we present theoretical simulations of laser-driven vibrational control of NO adsorbed on a gold surface. Our goal is to tailor laser pulses to selectively excite specific modes and vibrational eigenstates, as well as to favor photodesorption of the adsorbed molecule. To this end, various control schemes and algorithms are applied. For adsorbates at metallic surfaces, the creation of electron-hole pairs in the substrate is known to play a dominant role in the transfer of energy from the system to the surroundings. These nonadiabatic couplings are included perturbatively in our reduced density matrix simulations using a generalization of the state-resolved position-dependent anharmonic rate model we recently introduced. An extension of the reduced density matrix is also proposed to provide a sound model for photodesorption in dissipative systems.
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Affiliation(s)
- Jean Christophe Tremblay
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany.
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6
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Tremblay JC, Beyvers S, Saalfrank P. Selective excitation of coupled CO vibrations on a dissipative Cu(100) surface by shaped infrared laser pulses. J Chem Phys 2008; 128:194709. [DOI: 10.1063/1.2916710] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Wesenberg C, Autzen O, Hasselbrink E. Photochemistry on ultrathin metal films: Strongly enhanced cross sections for NO2 on Ag∕Si(100). J Chem Phys 2006; 125:224707. [PMID: 17176154 DOI: 10.1063/1.2402163] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The surface photochemistry of NO(2) on ultrathin Ag(111) films (5-60 nm) on Si(100) substrates has been studied. NO(2), forming N(2)O(4) on the surface, dissociates to release NO and NO(2) into the gas phase with translational energies exceeding the equivalent of the sample temperature. An increase of the photodesorption cross section is observed for 266 nm light when the film thickness is decreased below 30 nm despite the fact that the optical absorptivity decreases. For 4.4 nm film thickness this increase is about threefold. The data are consistent with a similar effect for 355 nm light. The reduced film thickness has no significant influence on the average translation energy of the desorbing molecules or the branching into the different channels. The increased photodesorption cross section is interpreted to result from photon absorption in the Si substrate producing electrons with no or little momenta parallel to the surface at energies where this is not allowed in Ag. It is suggested that these electrons penetrate through the Ag film despite the gap in the surface projected band structure.
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Affiliation(s)
- Claudia Wesenberg
- Fachbereich Chemie and Centre for Nanointegration (CeNIDE), Universität Duisburg-Essen, D-45117 Essen, Germany
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8
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Saalfrank P. Quantum Dynamical Approach to Ultrafast Molecular Desorption from Surfaces. Chem Rev 2006; 106:4116-59. [PMID: 17031982 DOI: 10.1021/cr0501691] [Citation(s) in RCA: 130] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter Saalfrank
- Theoretische Chemie, Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm, Germany
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Osgood R. Photoreaction Dynamics of Molecular Adsorbates on Semiconductor and Oxide Surfaces. Chem Rev 2006; 106:4379-401. [PMID: 17031991 DOI: 10.1021/cr050175x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Richard Osgood
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
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Nakamura H, Yamashita K. Theoretical study of the photodesorption mechanism of nitric oxide on a Ag(111) surface: A nonequilibrium Green’s function approach to hot-electron tunneling. J Chem Phys 2006; 125:084708. [PMID: 16965040 DOI: 10.1063/1.2338027] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The photoinduced desorption of NO molecules on a Ag surface was studied theoretically using a recently developed method based on the nonequilibrium Green's function approach combined with the density functional theory. Geometry optimizations for the stable NO dimer phase were carried out, and two structures of adsorbed dimers were identified. We calculated the reaction probabilities as a function of incident photon energy for each of the dimers and compared them with experimental action spectra. The two main features of the action spectra, (i) a long tail to the long wavelength (approximately 600 nm) and (ii) a rapid increase at approximately 350 nm, were well reproduced. By theoretical analysis, we found the importance of quantum interference for the interfacial charge transfer between the metal substrate and the adsorbate, as well as the contribution of secondary electrons. Our calculations suggest that the photoactive species is dimeric and that the resonant level is single for the photodesorption of NO.
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Affiliation(s)
- Hisao Nakamura
- Department of Chemical System Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
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Camillone N, Pak TR, Adib K, Osgood RM. Tuning Molecule−Surface Interactions with Sub-Nanometer-Thick Covalently Bound Organic Monolayers. J Phys Chem B 2006; 110:11334-43. [PMID: 16771404 DOI: 10.1021/jp0606659] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Measurements of the thermal desorption of methyl bromide (MeBr) from bare and RS-functionalized GaAs(110), where R = CH3 and CH3CH2, reveal marked systematic changes in molecule-surface interactions. As the thickness of the organic spacer layer is increased, the electrostatic MeBr-GaAs(110) interaction decreases, lowering the activation energy for desorption, Ed, as well as decreasing the critical coverage required for nucleation of bulklike MeBr. On the CH3CH2S-functionalized surface, Ed is lowered to a value roughly equal to that for desorption from three-dimensional (3-D) clusters; because the kinetics of desorption of isolated molecules differs from that for desorption from clusters, desorption of isolated molecules from the organic surface occurs at a lower temperature than desorption from the clusters. Thus, the "monolayer" desorption wave occurs at a lower temperature than the "multilayer" desorption wave. These results illustrate the role that organic chain length in nanometer-scale thin films can play in alteration of the delicate balance of interfacial interactions.
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Affiliation(s)
- Nicholas Camillone
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
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Nakamura H, Yamashita K. Electron tunneling of photochemical reactions on metal surfaces: Nonequilibrium Green’s function–density functional theory approach to photon energy dependence of reaction probability. J Chem Phys 2005; 122:194706. [PMID: 16161605 DOI: 10.1063/1.1902946] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
We have developed a theoretical model of photoinduced reactions on metal surfaces initiated by the substrate/indirect excitation mechanism using the nonequilibrium Green's function approach. We focus on electron transfer, which consists of (1) electron-hole pair creation, (2) transport of created hot electrons, and (3) tunneling of hot electrons to form an anion resonance. We assume that steps (1), (2), and (3) are separable. By this assumption, the electron dynamics might be restated as a tunneling problem of an open system. Combining the Keldysh time-independent formalism with the simple transport theory introduced by Berglund and Spicer, we present a practical scheme for first-principle calculation of the reaction probability as a function of incident photon energy. The method is illustrated by application to the photoinduced desorption/dissociation of O2 on a Ag(110) surface by adopting density functional theory.
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Affiliation(s)
- Hisao Nakamura
- Department of Chemical System Engineering, Graduate School of Engineering, University of Tokyo, Tokyo 113-8656, Japan
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Srivastava A, Osgood RM. State-resolved dynamics of 248 nm methyl-iodide fragmentation on GaAs(110). J Chem Phys 2003. [DOI: 10.1063/1.1619944] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Camillone N, Adib K, Khan KA, Mocuta D, Osgood RM. Dimethyl Sulfide Formation from Adsorbed Methanethiol: Surface Trapping of UV-Generated Reaction Intermediates. J Phys Chem B 2002. [DOI: 10.1021/jp021333g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nicholas Camillone
- Columbia Radiation Laboratory and Materials Science Program, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, and Brookhaven National Laboratory, Upton, New York 11973
| | - Kaveh Adib
- Columbia Radiation Laboratory and Materials Science Program, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, and Brookhaven National Laboratory, Upton, New York 11973
| | - Khalid A. Khan
- Columbia Radiation Laboratory and Materials Science Program, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, and Brookhaven National Laboratory, Upton, New York 11973
| | - Dan Mocuta
- Columbia Radiation Laboratory and Materials Science Program, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, and Brookhaven National Laboratory, Upton, New York 11973
| | - Richard M. Osgood
- Columbia Radiation Laboratory and Materials Science Program, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, and Brookhaven National Laboratory, Upton, New York 11973
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Srivastava A, Osgood RM. Photoreaction dynamics of CH3I multilayers on GaAs(110): REMPI probing of the CH3 umbrella mode. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00287-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Vondrak T, Burke DJ, Meech SR. Numerical modelling of the excitation energy dependence of adsorbate photochemistry at metal surfaces. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)01036-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Camillone N, Khan KA, Yarmoff JA, Osgood RM. Surface-reconstruction-switched adsorbate photofragmentation dynamics. PHYSICAL REVIEW LETTERS 2001; 87:056101. [PMID: 11497789 DOI: 10.1103/physrevlett.87.056101] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2000] [Indexed: 05/23/2023]
Abstract
Energy-resolved angular distributions of neutral fragments ejected during photoinduced electron transfer reaction of CH3Br on GaAs(100) exhibit three distinct methyl-radical ejection channels. These undergo marked changes when the termination is switched from the Ga-rich c(8 x 2) to the As-rich c(2 x 8). Our observations are consistent with a strong adsorption-site dependence of the dynamics.
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Affiliation(s)
- N Camillone
- Columbia Radiation Laboratory, Columbia University, New York, New York 10027, USA.
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Khan KA, Camillone N, Osgood RM. Chain-Length Dependence of the Dissociation Dynamics of Oriented Molecular Adsorbates: n-Alkyl Bromides on GaAs(110). J Phys Chem B 1999. [DOI: 10.1021/jp990782m] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Khalid A. Khan
- Columbia Radiation Laboratory, Columbia University, New York, New York 10027
| | - Nicholas Camillone
- Columbia Radiation Laboratory, Columbia University, New York, New York 10027
| | - Richard M. Osgood
- Columbia Radiation Laboratory, Columbia University, New York, New York 10027
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Khan KA, Camillone N, Osgood RM. Photoinitiated electron transfer to selected physisorbed alkyl bromides: The effects of alkyl chain length on dissociation cross sections. J Chem Phys 1999. [DOI: 10.1063/1.478984] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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