Article
Astronomy & Astrophysics
Daniel R. Piacitelli, Erik Solhaug, Yakov Faerman, Matthew McQuinn
Summary: Motivated by the development of integral field units (IFUs) on ground telescopes and proposals for ultraviolet-sensitive space telescopes, this research explores the potential of using emission lines to study the circumgalactic medium (CGM) and its relationship to galaxy formation. The study identifies O III 5007 angstrom, N II 6583 angstrom, O v 630 angstrom, and O VI 1032,1038 angstrom as the most promising emission lines for detection. Formulas are provided to simplify the application of these estimates to other samples and scenarios. The study also discusses the detectability of C III 978 angstrom, C IV 1548 angstrom, H alpha, and hydrogen n > 2 Ly-series lines.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Feng Wang, Kun Zhang, Fei Mao, Jian Wang
Summary: In this study, the probability of electron capture of energetic protons colliding with rare-gas atoms was calculated using four methods based on time-dependent density-functional theory (TDDFT). A new effective model of pair-correlation function was developed by approximating the pair correlation function with an explicit dependence on the fractional number of bound electrons. Benchmark calculations demonstrated that the new designed read-out functional accurately reproduced the single-electron capture cross sections and the double-electron capture features, which were not properly described by previous TDDFT calculations.
Article
Astronomy & Astrophysics
W. Li, A. M. Amarsi, A. Papoulia, J. Ekman, P. Jonsson
Summary: Accurate atomic data are crucial for opacity calculations and abundance analyses of stars. This work aims to provide precise energy levels and transition data for carbon using advanced computational methods. Extensive comparisons with experimental and theoretical results show good agreement, with average uncertainties estimated for different carbon ions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Physics, Multidisciplinary
Ya-Ting Sun, Feng Wang, Su-Na Pang, Fei Mao, Chen-Guang Li
Summary: The charge-state effects on charge transfer of helium ions in gold nanosheet were investigated using the time-dependent density functional theory coupled to the molecular dynamics. Two novel computational methods were developed to characterize and extract the charge-state information of incident particles inside the nanosheet. The study found that the charge transfer behavior of He ion in gold nanosheet is sensitive to its charge state at the time of incident. The results provide new insights into the interaction between He ions and gold nanosheet, and validate the ability of current methodology in dealing with ion collisions in materials.
NEW JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Physical
Inho Seong, Sijun Kim, Minsu Choi, Woobeen Lee, Wonnyoung Jeong, Chulhee Cho, Yebin You, Youngseok Lee, Youbin Seol, Shinjae You
Summary: The understanding of ion dynamics in plasma applications has been studied. The effects of He and Ar species on Ar ion flux on the substrate were examined in an inductively coupled Ar/He plasma source. It was found that the addition of He enhances the Ar ion flux, and this enhancement becomes more significant with increasing pressure. These findings suggest the potential use of heterogeneous charge transfer collisions to enhance ion flux in plasma processing.
Article
Astronomy & Astrophysics
Andres Vicente Arevalo, Jiri Stepan, Tanausu del Pino Aleman, Maria Jesus Martinez Gonzalez
Summary: We investigate the impact of relaxing two common approximations on the formation of Stokes profiles of the He I multiplet at 10 830 angstrom. These approximations include the lack of self-consistent radiation transfer and the assumption of equal illumination of the multiplet components. The He I multiplet is crucial for diagnosing the outer solar atmosphere, but the validity of these approximations needs to be evaluated, especially in situations with significant radiation transfer and different illumination effects. By extending the atomic statistical equilibrium equations and implementing them in a one-dimensional radiative transfer code, we find that both radiation transfer and differential illumination have a significant influence on the emergent polarization profiles, emphasizing the importance of considering these effects for accurate magnetic field inference.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Huimin Qiao, Pin Zhao, Owoong Kwon, Ahrum Sohn, Fangping Zhuo, Dong-Min Lee, Changhyo Sun, Daehee Seol, Daesu Lee, Sang-Woo Kim, Yunseok Kim
Summary: The triboelectric effect, a ubiquitous phenomenon in which surfaces of two materials are easily charged during contact-separation, is influenced by the competition between flexoelectricity and triboelectricity in the presence of a strain gradient. This competition can modulate the direction and amount of charge transfer, leading to a distinctive phenomenon where charge transfer is reversed with varying forces. The experimental results support the proposed mechanism and suggest that manipulating the mixed triboelectric and flexoelectric effects can modulate both the amount and direction of charge transfer.
Article
Chemistry, Physical
Chenxu Lu, Menghang Shi, Shengzhe Pan, Lianrong Zhou, Junjie Qiang, Peifen Lu, Wenbin Zhang, Jian Wu
Summary: We experimentally investigated the three-body fragmentation dynamics of an ArKr2 cluster upon its ionization by an intense femtosecond laser pulse. A novel comet-like structure was observed in the Newton diagram of the quadruple-ionization-induced breakup channel. The structure consists of a concentrated head part originating from direct Coulomb explosion and a broader tail part resulting from electron transfer between distant ion fragments.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jinfeng Chen, Yang Yang, Shenghao Zhao, Fukun Bi, Liang Song, Ning Liu, Jingcheng Xu, Yuxin Wang, Xiaodong Zhang
Summary: This study presents a new strategy to enhance the charge transfer from Zr atoms in UiO-66 to black phosphorus (BP) for the photocatalytic degradation of toluene and o-dichlorobenzene. The formation of Zr-P bonds is the key to improve the charge-transfer capability of BP-UiO, which is encapsulated by a hydrophilic porous mesh-like UiO-66 layer. BP-UiO shows enhanced visible-light-harvesting ability, charge transport capability, and photocatalytic activity. In situ IR and GC-MS techniques are used to investigate the degradation pathways of contaminants.
Article
Engineering, Environmental
Huanhuan Yao, Weike Zhu, Jie Hu, Cheng Wu, Shurong Wang, Xuhong Zhao, Xiaobin Niu, Liming Ding, Feng Hao
Summary: Stability is a key factor limiting the development of lead-free tin halide perovskite solar cells (TPSCs). The introduction of bulky additives in tin perovskites can improve the structural stability and device performance. Halogen engineering reduces defect density and inhibits non-radiative recombination, resulting in higher power conversion efficiency (PCE) and open-circuit voltage (Voc). The unencapsulated devices maintain a high PCE after extended storage time.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Optics
H. Fleurbaey, D. Mondelain, W. Fakhardji, J. M. Hartmann, A. Campargue
Summary: In this study, a collision induced absorption (CIA) band near 6000 cm(-1) in a humidified CO2 spectrum was measured using cavity ring down spectroscopy (CRDS). The origin and characteristics of this absorption were confirmed through isotopic analysis and classical molecular dynamics simulations.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Astronomy & Astrophysics
A. Floers, R. F. Silva, J. Deprince, H. Carvajal Gallego, G. Leck, L. J. Shingles, G. Martinez-Pinedo, J. M. Sampaio, P. Amaro, J. P. Marques, S. Goriely, P. Quinet, P. Palmeri, M. Godefroid
Summary: This study investigates the accuracy of calculated atomic data on the opacity of kilonovae by performing atomic structure calculations of neodymium and uranium. The results show that the opacity of uranium is almost double that of neodymium.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Santanu Mondal, Tek P. Adhikari, Chandra B. Singh
Summary: The study investigates the effects of X-ray flux from the inner hot region around a central compact object in a binary system on the accretion disk, and the impact of different parameters on line spectra and Fe-line emission properties. It is found that the Fe-line equivalent width decreases with increasing accretion rate and increases with the column density of the illuminated gas.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Optics
Fatima Talhi, Moncef Bouledroua
Summary: The aim of this study is to characterize the molecular ions (ArH+)-Ar-36 and (ArH+)-Ar-38 found in the Crab Nebula and the PKS 1823-211 galaxy. The focus is on analyzing the radiative processes of association and charge transfer in ArH+. Potential energy curves and dipole moments are utilized to construct the ground and excited states of ArH+. Quantum-mechanical calculations are performed to compute cross sections and temperature-dependent rate coefficients for the radiative processes.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Sang Woo Kwak, Ju Hyun Hong, Sang Hoon Lee, Min Kim, Yongseog Chung, Kang Mun Lee, Youngjo Kim, Myung Hwan Park
Summary: A novel class of quinolinol-based dimeric indium complexes were synthesized and characterized, showing typical low-energy absorption bands and emission spectra with gradual redshifts as solvent polarity increased. Substituents at the C5 position of the quinoline groups significantly affected the emission bands.
Article
Physics, Multidisciplinary
Tinggui Chen, Baizhan Xia, Dejie Yu, Chuanxing Bi
Summary: This study proposes a gradient phononic crystal structure for enhanced acoustic sensing. By breaking the symmetry of the PC structure, topologically protected edge states are introduced, resulting in topological acoustic rainbow trapping. The robustness and enhancement properties are verified numerically and experimentally.
