Article
Chemistry, Physical
Valery G. Nazin, Alexey M. Lebedev, Ratibor G. Chumakov, Dmitry V. Averyanov, Ivan S. Sokolov, Oleg E. Parfenov, Oleg A. Kondratev, Andrey M. Tokmachev, Vyacheslav G. Storchak
Summary: The band structure of EuSi2, an intriguing material with unconventional properties, has been investigated using X-ray photoemission spectroscopy. The experimental results have resolved the controversy in theoretical studies and provided insights into the 4f magnet EuSi2, serving as a foundation for the study of similar materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Multidisciplinary
Yanwen Sun, Gabriella Carini, Matthieu Chollet, Franz-Josef Decker, Mike Dunne, Paul Fuoss, Stephan O. Hruszkewycz, Thomas J. Lane, Kazutaka Nakahara, Silke Nelson, Aymeric Robert, Takahiro Sato, Sanghoon Song, G. Brian Stephenson, Mark Sutton, Tim B. Van Driel, Clemens Weninger, Diling Zhu
Summary: Observations of nanosecond nonuniform colloidal dynamics in a free flowing liquid jet were reported using ultrafast x-ray speckle visibility spectroscopy. The study utilized a double-bunch mode to produce femtosecond coherent x-ray pulses and evaluated the average particle flow rate and nonuniform flow field within the colloidal nanoparticle jet by exploring anisotropy in speckle patterns. This methodology establishes a foundation for studying nano- and atomic-scale inhomogeneous fluctuations in complex matter using x-ray free electron laser sources.
PHYSICAL REVIEW LETTERS
(2021)
Review
Chemistry, Physical
Selene Mor, Marc Herzog, Claude Monney, Julia Staehler
Summary: An excitonic insulator phase is formed by the spontaneous formation of electron-hole pairs (excitons) in semiconductors, with higher exciton binding energy than the electronic band gap. Employing a nonequilibrium approach, the photoinduced dynamics of an exciton condensate and the valence band electrons in Ta2NiSe5 were studied. The findings reveal the energy gain of ground state exciton formation and demonstrate the use of time-resolved photoemission to study the re-formation dynamics of an exciton condensate.
PROGRESS IN SURFACE SCIENCE
(2022)
Article
Energy & Fuels
Patrick Schnell, Erwin Fernandez, Keisuke Obata, Jennifer Velazquez Rojas, Marco Favaro, Thomas Dittrich, Roel van de Krol, Fatwa F. Abdi
Summary: alpha-SnWO4 is a promising photoelectrode material for water splitting, but it faces challenges of surface passivation and limited photovoltage. Previous studies suggest that interfacial oxidation leads to Fermi-level pinning at the alpha-SnWO4/oxide interface. In this study, surface photovoltage analysis and hard X-ray photoelectron spectroscopy are used to investigate the electronic structure and identify a defect state responsible for Fermi-level pinning.
Article
Chemistry, Multidisciplinary
Masahiro Shibuta, Kazuo Yamamoto, Tsutomu Ohta, Tomoya Inoue, Kaito Mizoguchi, Masato Nakaya, Toyoaki Eguchi, Atsushi Nakajima
Summary: The study investigated the generation and relaxation dynamics of hot electrons by creating a molecularly well-defined heterointerface between size-selected plasmonic noble-metal nanoclusters and an organic film. By tuning the nanocluster size and excitation photon polarization, plasmonic behavior characterized by significant intensity enhancement was observed, shedding light on the mechanism of ultrafast confined hot electron relaxation within plasmonic nanoclusters.
Article
Chemistry, Physical
Michael G. Raymer, Tiemo Landes, Andrew H. Marcus
Summary: This article explores the theoretical and experimental studies of two-photon absorption of molecules with time-frequency-entangled photon pairs and other nonlinear interactions, focused on handling the quantum nature of light. It combines basic quantum optics theory with density matrix derivation, emphasizing the use of entangled states and the enhancement of TPA. The article also compares TPA processes occurring via different intermediate states and discusses the challenges faced in experimental studies.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Rebekka Weber, Stephan Junek, Alexander Heckel
Summary: In this study, a blue light and NIR light activatable rhodamine fluorophore was developed for biological imaging. By immobilizing the fluorophore in a hydrogel, spatially resolved illumination patterns with excellent contrast could be written and read after both one-photon and two-photon excitation.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Gaelle Martin-Gassin, Erwan Paineau, Pascale Launois, Pierre -Marie Gassin
Summary: In this study, the organization of water around imogolite nanotubes in solution was investigated using the nonlinear optical technique of polarization resolved second harmonic scattering (SHS). The results showed that the water organization was determined by the electric field induced by the nanotube walls and was strongly dependent on the ionic strength of the suspension.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Gaelle Martin-Gassin, Erwan Paineau, Pascale Launois, Pierre-Marie Gassin
Summary: This study investigates the organization of water molecules around Imogolite nanotubes using the nonlinear optical technique of polarization resolved second harmonic scattering (SHS). The results demonstrate that water organization depends on the electric field induced by the nanotube walls and the ionic strength of the suspension.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Alexander Gloystein, Mina Soltanmohammadi, Niklas Nilius
Summary: Comparisons are made between global photoluminescence (PL) and spatially resolved scanning tunneling microscopy (STM) luminescence in thick Cu2O films grown on Au(111). The PL data show two peaks at 750 and 850 nm, associated with radiative electron decays through localized gap states induced by O vacancies. In contrast, a wide-band emission between 700 and 950 nm is observed in STM luminescence, which is attributed to cavity plasmons stimulated by inelastic electron tunneling and does not exhibit spectral features of Cu2O defects. However, O vacancies still control the STM luminescence by providing inelastic excitation channels for cavity plasmons.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Optics
Xiaoyang Yu, Meng Han, Zhenning Guo, Yunquan Liu
Summary: This study investigates benchmark photoionization of hydrogen atoms triggered by vacuum ultraviolet and weak fundamental laser pulses, probing time delay via resonant quantum states. Two different sidebands are established through resonance with the hydrogen atom's 3d and 2p states. By comparing phase differences between two sidebands, the angularly dependent time delay of electrons liberated from different states can be extracted. Using the asymmetric attosecond beating scheme, the intrinsic time delay between the 3d and 2p excited electronic states in the few-photon ionization regime of H atoms is determined to be around 103 as.
Article
Chemistry, Physical
Gary Wan, Mattia Cattelan, Alex Croot, Hugo Dominguez-Andrade, Shannon S. Nicley, Ken Haenen, Neil A. Fox
Summary: This study investigates low energy electron emission from low work function hydrogen terminated diamond surfaces and finds that electron emission is dominated by electrons within the band gap energy region, with sub-bandgap illumination significantly increasing emission current. Upward surface band bending greater than 2 eV was observed for diamond samples, affecting electron accumulation at the surfaces. Intra-bandgap states strongly influence electron emission behavior, which has great implications for various energy conversion devices.
Article
Chemistry, Physical
Quentin Borengasser, Travis Hager, Anudha Kanaherarachchi, Diego Troya, Bernadette M. M. Broderick
Summary: We present a novel technique for detecting molecules desorbed from an ice surface using broad-band millimeter-wave rotational spectroscopy. The method allows for the investigation of molecules that have undergone temperature-programmed desorption (TPD), similar to the warming phase of icy grains in the interstellar medium. The detection is conformer-and isomer-specific and quantitative, enabled by chirped-pulse rotational spectroscopy.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
A. Kolomiets, M. Paukov, J. Valenta, B. Chatterjee, A. Andreev, K. O. Kvashnina, F. Wilhelm, A. Rogalev, D. Drozdenko, P. Minarik, J. Kolorenc, M. Richter, J. Prchal, L. Havela
Summary: In this study, the 5f-based ferromagnet UGa2 was investigated using X-ray absorption spectroscopy and X-ray magnetic circular dichroism. The results showed that the uranium 5f states have a large orbital magnetic moment, partially compensated by the antiparallel spin moment, resulting in a total 5f magnetic moment. Comparison between experimental and theoretical results revealed a clear correlation between the uranium ionicity of different metallic uranium compounds.
Article
Chemistry, Multidisciplinary
Louis Thomas, Imane Arbouch, David Guerin, Xavier Wallart, Colin van Dyck, Thierry Melin, Jerome Cornil, Dominique Vuillaume, Stephane Lenfant
Summary: We investigated the electrical properties of self-assembled molecular photoswitches on cobalt and found a correlation between the molecular orientation and the conductance of the molecule-Co interface. The ON/OFF conductance ratio was similar in experimental and theoretical results, indicating a good potential for exploring spin-polarized charge transport and the molecule-Co spinterface relationship.
Article
Chemistry, Multidisciplinary
Fei Ge, Bo-Han Li, Puxin Cheng, Geng Li, Zefeng Ren, Jialiang Xu, Xian-He Bu
Summary: Chiral hybrid organic-inorganic metal halides (HOMHs) based on Cu-I halides were synthesized, showing well-balanced NLO performances, highly efficient SHG response, outstanding optical transparency, and high LDT. The effective second-order NLO coefficient of (R-MBA)CuBr2 is two orders of magnitude higher than that of their Cu-II counterparts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Multidisciplinary
Jascha A. Lau, Varun B. Verma, Dirk Schwarzer, Alec M. Wodtke
Summary: The revolution in mid-infrared light detection based on superconducting materials provides new opportunities for applications in molecular science, with potential for sensitivity and characteristics comparable to established single-photon detectors in the UV/Vis region. This makes superconducting infrared detectors an indispensable tool in the field of physical chemistry.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Chemistry, Physical
Jan Fingerhut, Dmitriy Borodin, Loic Lecroart, Michael Schwarzer, Stefan Hoerandl, Alexander Kandratsenka, Daniel J. Auerbach, Alec M. Wodtke, Theofanis N. Kitsopoulos
Summary: Velocity-resolved kinetics was used to measure the thermal rate of formic acid desorption from Pd(111) surface for four isotopologues. A mass-balance-based calibration procedure was implemented to determine the branching ratio between desorption and decomposition for formic acid. The detailed balance rate model (DBRM) was used to obtain the binding energy and diffusion barrier from experimentally derived desorption rate constants, and it explained the observed kinetic isotope effects.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Zefeng Ren, Ruidan Zhang, Ting Luo, Wei-Wang Zeng, Chuanyao Zhou, Xueming Yang
Summary: Surfacesensitive sum frequency generation vibrational spectroscopy (SFG-VS) was used to study the adsorption and reaction of methanol on TiO2(110) at near ambient pressure and 400K. The results showed that bridge-bonded methoxy (CH3Ob) was the dominant adsorbed species on TiO2(110) at an elevated pressure of methanol. By evacuating the methanol gas, only CH3Ob species remained on the surface, which was confirmed by UV irradiation experiments. It was also found that the recombinative desorption of bridging hydroxyl (OHb) groups can facilitate the continuous dissociative adsorption of methanol and the continuous generation of CH3Ob.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Kerstin Krueger, Yingqi Wang, Sophia Toedter, Felix Debbeler, Anna Matveenko, Nils Hertl, Xueyao Zhou, Bin Jiang, Hua Guo, Alec M. Wodtke, Oliver Buenermann
Summary: The Born-Oppenheimer approximation is crucial in computational chemistry, but its validity under different conditions is still a topic of interest. Scattering experiments with hydrogen atoms on various surfaces have shed light on this matter. In this study, hydrogen atom scattering from a semiconductor surface revealed two channels, with one being accurately described by the Born-Oppenheimer approximation and the other showing a higher energy transfer that was not captured in simulations.
Article
Spectroscopy
Guanhua Zhang, Lina Liu, Shengxue Zhou, Yu Liang, Julong Sun, Lei Liu, Chuanyao Zhou, Liying Jiao, Xueming Yang, Zefeng Ren
Summary: A grounding Au grids method has been developed to characterize the electric and photoelectric properties of CVD-grown MoS2 on insulating substrates, effectively eliminating signal interference. This method provides a reliable way to study 2D materials using electron and photoelectron probes.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2023)
Article
Chemistry, Physical
Wei Chen, Yajie Gao, Tianjun Wang, Qunqing Hao, Zhiqiang Wang, Zefeng Ren, Xueming Yang, Chuanyao Zhou
Summary: By using TPD and UPS, the adsorption, diffusion, and desorption behaviors of deuterium atoms in rutile TiO2(011) have been studied. It was found that a small portion of D atoms adsorb at surface oxygen sites, resulting in band gap states and desorbing as water. Most of the D atoms diffuse into the bulk and desorb as D2/HD. Detailed analysis indicates that the bulk D will diffuse back to the surface and recombine as D2.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Jiamei Quan, Rongrong Yin, Zibo Zhao, Ximei Yang, Alexander Kandratsenka, Daniel J. Auerbach, Alec M. Wodtke, Hua Guo, G. Barratt Park
Summary: We employed time-slice and velocity map ion imaging methods to investigate the dynamics of thermal N2O decomposition on Pd(110) at the quantum-state resolved level. Two reaction channels were observed: a thermal channel involving N-2 products initially trapped at surface defects, and a hyperthermal channel where N-2 is released directly to the gas phase from N2O adsorbed on bridge sites. The hyperthermal N-2 exhibited high rotational excitation and significant translational energy, with a considerable portion of the energy released during dissociation being taken up by the desorbed N-2. The characteristics of the hyperthermal channel were explained using classical trajectories on a high-dimensional potential energy surface and the sudden vector projection model.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Zibo Zhao, Yingqi Wang, Ximei Yang, Jiamei Quan, Bastian C. Krueger, Paula Stoicescu, Reed Nieman, Daniel J. Auerbach, Alec M. Wodtke, Hua Guo, G. Barratt Park
Summary: The alignment of spins is essential for the formation of two-electron chemical bonds. While it is known that changing a molecule's electronic spin state can significantly impact its reactivity in gas-phase reactions, the role of electronic spin in surface chemistry remains controversial due to the absence of definitive state-to-state experiments. This study uses an incoming/outgoing correlation ion imaging technique to perform scattering experiments and demonstrates that O(D-1) is more reactive with graphite than O(P-3), also identifying electronically nonadiabatic pathways.
Article
Physics, Atomic, Molecular & Chemical
Wen Zhang, Yong Zhou, Wei Chen, Tianjun Wang, Zhaoxian Qin, Gao Li, Zefeng Ren, Xueming Yang, Chuanyao Zhou
Summary: Plasmonic catalysis, driven by surface plasmon resonance of metal nanoparticles, is a new field in heterogeneous catalysis. The understanding of its microscopic mechanism is controversial due to temperature measurement inaccuracy and reagent adsorption state ambiguity. To investigate the kinetics of plasmonic catalysis, an online mass spectrometer-based apparatus with improved temperature measurement and adsorption state identification is developed. The study of a model plasmon-induced catalytic reaction confirms dissociative adsorption and non-thermal contribution to product formation.
CHINESE JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Bo-Han Li, Huang Li, Haipeng Di, Zhipeng Xuan, Wen Zeng, Jia-Cheng Wang, Da-Bing Cheng, Chuanyao Zhou, Xingan Wang, Yiying Zhao, Jingquan Zhang, Zefeng Ren, Xueming Yang
Summary: In this study, the carrier density-dependent dynamics in hybrid lead iodide perovskites were investigated using a highly sensitive transient absorption spectrometer. It was found that PbCl2 passivation can effectively reduce both shallow and deep trap densities. These results provide important insights for photovoltaic and optoelectronic applications under sunlight.
Article
Chemistry, Physical
Michael Schwarzer, Nils Hertl, Florian Nitz, Dmitriy Borodin, Jan Fingerhut, Theofanis N. Kitsopoulos, Alec M. Wodtke
Summary: The thermal recombinative desorption rates of HD on Pd(111) and Pd(332) surfaces were studied through transient kinetic experiments. A detailed kinetic model accurately described the competition between the recombination of surface-adsorbed hydrogen and deuterium atoms and their diffusion into the bulk. The obtained results provide valuable information on the dissociative adsorption energies, binding energy, and the energy required for surface-to-bulk diffusion of H and D atoms.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Arved C. Dorst, Friedrich Guethoff, Daniel Schauermann, Alec M. Wodtke, Daniel R. Killelea, Tim Schaefer
Summary: In this study, the researchers combined velocity map imaging (VMI) with temperature-programmed desorption (TPD) experiments to record the angular-resolved velocity distributions of recombinatively-desorbing oxygen from Rh(111). By matching the recorded distributions to the desorption temperature, they were able to assign the velocity distributions to desorption from specific surface and sub-surface states, providing insights into the recombinative desorption mechanisms and the availability of oxygen for surface-catalyzed reactions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Yuan Huang, Yun-Kun Wang, Xin-Yu Huang, Guan-Hua Zhang, Xu Han, Yang Yang, Yunan Gao, Lei Meng, Yushu Wang, Guang-Zhou Geng, Li-Wei Liu, Lin Zhao, Zhi-Hai Cheng, Xin-Feng Liu, Ze-Feng Ren, Hui-Xia Yang, Yufeng Hao, Hong-Jun Gao, Xing-Jiang Zhou, Wei Ji, Ye-Liang Wang
Summary: A universal method using pretreated densely patterned hole array substrates has been reported for preparing large-area suspended mono- and few-layer 2D materials, with improved performance evaluated using multiple characterization tools. This work provides an innovative and efficient route for fabricating suspended 2D materials and exploring their intrinsic properties.
Article
Chemistry, Multidisciplinary
Kecheng Long, Shaozhen Huang, Han Wang, Anbang Wang, Yuejiao Chen, Zhijian Liu, Yu Zhang, Zhibin Wu, Weikun Wang, Libao Chen
Summary: This study proposes a low-cost Li foil surface-reconstruction strategy using a mechanochemistry reaction between fumed silica and Li to achieve dendrite-free Li metal anode. The reconstructed surface enhances the electrode dynamics and constructs an anionphilic interface, leading to significantly improved low-temperature and cycling performance of Li metal batteries while maintaining high energy density and stable cycle performance.
ENERGY & ENVIRONMENTAL SCIENCE
(2024)
Article
Chemistry, Multidisciplinary
Changchun Ye, Zhenghui Pan, Qinghua Zhang, Fang Yin, Yanan Wang, Yifei Li, Guangxu Chen, Jia Li, Yongcai Qiu, Geoffrey I. N. Waterhouse, Lin Gu, Zhang Lin, Lin Guo
Summary: A facile synthesis route for heterostructured metal oxides via quenching-induced structural transformation was developed. Multiple quenching triggered the transformation from NiMoO4 to NiFe2O4, creating a novel heterostructure, and the pre-quenching generated disordered defect structure can promote subsequent quenching regulation.
ENERGY & ENVIRONMENTAL SCIENCE
(2024)
Article
Chemistry, Multidisciplinary
Yang Liu, Xufei An, Ke Yang, Jiabin Ma, Jinshuo Mi, Danfeng Zhang, Xing Cheng, Yuhang Li, Yuetao Ma, Ming Liu, Feiyu Kang, Yan-Bing He
Summary: The lack of understanding of ion transport in the cathode of PVDF-based solid-state lithium metal batteries limits their performance. The use of carbon-coated Li1.4Al0.4Ti1.6(PO4)3 nanowires as a cathode filler improves the diffusion of ions in the thick cathode, leading to enhanced battery performance and stability.
ENERGY & ENVIRONMENTAL SCIENCE
(2024)
Article
Chemistry, Multidisciplinary
Zixing Wang, Kang Luo, Jian-Fang Wu, Peng Gao, Kexuan Wang, Shi Chen, Jian Tu, Xiulin Fan, Jilei Liu
Summary: This study improves the performance limitations of potassium-ion batteries at extreme temperatures by regulating the ion-solvent-coordinated structure, leading to enhanced cycling performance and capacity retention.
ENERGY & ENVIRONMENTAL SCIENCE
(2024)
Article
Chemistry, Multidisciplinary
Shan Jiang, Ruyue Wang, Minghua Li, Runnan Yu, Fuzhi Wang, Zhan'ao Tan
Summary: This study developed a synergistic electrical and light management strategy to maximize the voltage output in monolithic perovskite/organic tandem solar cells. By optimizing the interface contact and regulating the donor/acceptor ratio, the fabricated cells achieved remarkable power conversion efficiency and high open-circuit voltage.
ENERGY & ENVIRONMENTAL SCIENCE
(2024)
Article
Chemistry, Multidisciplinary
Gwanho Kim, Jae Won Lee, Kaiying Zhao, Taebin Kim, Woojoong Kim, Jin Woo Oh, Kyuho Lee, Jihye Jang, Guangtao Zan, Jong Woong Park, Seokyeong Lee, Yeonji Kim, Wei Jiang, Shengyou Li, Cheolmin Park
Summary: In this study, a new type of complementary energy harvester that can simultaneously generate moisture-induced and triboelectric power is introduced. This device exhibits high resilience, high energy output, and potential applications in emergency guidance systems.
ENERGY & ENVIRONMENTAL SCIENCE
(2024)
