Results in Physics最新文献

{"title":"Influence of coulomb effects on electron dynamics in orthogonally polarized two-color laser fields","authors":"Hristina S. Delibašić-Marković ,&nbsp;Violeta M. Petrović ,&nbsp;Ivan D. Petrović","doi":"10.1016/j.rinp.2024.108093","DOIUrl":"10.1016/j.rinp.2024.108093","url":null,"abstract":"<div><div>This study examines the ionization dynamics of argon atoms under orthogonally polarized two-color laser fields, highlighting the impact of field strength ratio on ionization rates and electron momentum. Utilizing a theoretical framework, we compare our results with various models to delineate the effects of Coulomb potential across different field strength ratios. The investigation reveals that the distribution of electric field strength over orthogonal components influences the ionization efficiency, with variations in ionization rates and momentum distributions across a range of intensities. Our findings contribute to a deeper understanding of strong-field ionization processes, providing insights into the interplay between field geometry and electron dynamics.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"68 ","pages":"Article 108093"},"PeriodicalIF":4.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis, Hirshfeld Surfaces and Characterization of Diethanolaminium 3,5-dinitrosalicylate single crystal for NLO application","authors":"B Shanmuga Priya,&nbsp;D. Rajan Babu","doi":"10.1016/j.rinp.2024.108077","DOIUrl":"10.1016/j.rinp.2024.108077","url":null,"abstract":"<div><div>A novel organic Diethanolaminium 3,5-dinitrosalicylate was obtained at room temperature from an equimolar solute concentration in Millipore water. The resulting crystal crystallized in the Triclinic P −1 system. Examining the Hirshfeld Surfaces confirms the presence of π-π stacking in the molecule. The 2D fingerprint plots obtained by the analysis of HS provide information regarding various interactions contributing to crystal packing. A review of the spectrum produced by FTIR spectroscopy was conducted to analyze the frequencies associated with functional groups. NMR studies detected the different Carbon and Hydrogen atoms in distinct chemical environments. The optical studies suggest that the obtained crystal shows low absorption in the 450––750 nm region with 2.55 eV corresponding to direct bandgap. The crystal’s refractive index is calculated as 1.693. A high HOMO-LUMO gap value indicates stability and less reactivity of the material. The synthesized material decomposes above 205 °C. The analysis of Z-Scan revealed that the third-order susceptibility was 3.726 × 10^-8 esu. The Z-Scan analysis reveals the Reverse Saturable Absorption and self-defocusing behavior of DANS.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"68 ","pages":"Article 108077"},"PeriodicalIF":4.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compact low-noise GeV-scale electron-positron pair spectrometer","authors":"Jaehyun Song ,&nbsp;Youhwan Noh ,&nbsp;Mohammad Mirzaie ,&nbsp;Calin Ioan Hojbota ,&nbsp;Hyeong-il Kim ,&nbsp;Seongmin Lee ,&nbsp;Junho Won ,&nbsp;Chiwan Song ,&nbsp;Woosuk Bang","doi":"10.1016/j.rinp.2024.108091","DOIUrl":"10.1016/j.rinp.2024.108091","url":null,"abstract":"<div><div>Recent studies have successfully demonstrated a high-flux GeV-scale gamma-ray spectrometer using energy spectra of electron–positron pairs generated in a high-Z converter. In a confined space of a meter, resolving GeV-scale pair particles using a permanent magnet is challenging owing to its relatively weak magnetic field strength of around 1 T. In this study, we present a compact low-background GeV-scale electron–positron pair spectrometer design, utilizing permanent magnets and imaging plates, and its experimental validation. We investigated the arrangement of magnet blocks using Geant4 simulations to enhance energy resolution over a wide spectral range from MeV to GeV. An asymmetrical yoke design was implemented to maximize the bending power without obstructing particle trajectories. We utilized and evaluated the pair spectrometer system in pair-production experiments using a multi-petawatt laser, successfully detecting GeV-range electron–positron pair particles. Additional Geant4 simulations were conducted to validate the spectrometer’s performance. This research contributes to the advancement of experimental capabilities in particle physics, especially for gamma-ray spectrometers in space-constrained environments.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"68 ","pages":"Article 108091"},"PeriodicalIF":4.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and performance analysis of the 200 keV Cockcroft-Walton ion accelerator","authors":"H.R. Mirzaei ,&nbsp;S.H. Sanaye ,&nbsp;B. Yadollahzadeh ,&nbsp;M. Shirshekan ,&nbsp;M. Asl beigi ,&nbsp;O. Hasanpour ,&nbsp;Z. Riazi Mobaraki ,&nbsp;F. Ghasemi ,&nbsp;A. Mohammadi ,&nbsp;M. Sadafi Biabli ,&nbsp;A. Abbasi ,&nbsp;M. Nazari ,&nbsp;M. Dehghan ,&nbsp;J. Rahighi ,&nbsp;M. Jafarzadeh Khatibani ,&nbsp;H. Ghods ,&nbsp;A. Najafian","doi":"10.1016/j.rinp.2024.108089","DOIUrl":"10.1016/j.rinp.2024.108089","url":null,"abstract":"<div><div>This study reports the successful design, construction, and testing of a 200 keV electrostatic ion accelerator at NSTRI, emphasizing its beam transport performance and diagnostic capabilities. The system features a 13.56 MHz inductive RF ion source, a 200 kV high-voltage power supply, an acceleration section, a multi-component beam transport and diagnostic setup. Experimental results demonstrate a maximum beam current of 600 µA. Optimized beam dynamics, confirmed through simulations and experiments, yield focused beam profiles with RMS sizes of 4.2 mm (x) and 3.8 mm (y) at 150 keV. The diagnostic system, equipped with quadrupole and dipole magnets, enables precise measurement of beam current, divergence, emittance, and momentum spectrum. These results validate the accelerator performance, its agreement with simulations and its potential for advancing low-energy ion beam applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"68 ","pages":"Article 108089"},"PeriodicalIF":4.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Silver (Ag) doped graphitic carbon nitride (g-C3N4)/biochar composite photocatalyst for improved photocatalytic degradation of ciprofloxacin (CIP)","authors":"Ijlal Idrees ,&nbsp;Muhammad Zafar ,&nbsp;Malik Adeel Umer ,&nbsp;Fahad Rehman ,&nbsp;Abdul Razzaq ,&nbsp;Seongwan Kim ,&nbsp;Yunsook Yang ,&nbsp;Woo Young Kim","doi":"10.1016/j.rinp.2024.108071","DOIUrl":"10.1016/j.rinp.2024.108071","url":null,"abstract":"<div><div>Dumping pharmaceutical wastewater into aquatic bodies vigorously adds to environmental pollution and amplifies antibiotic-resilient bacteria (ARB), a potential danger to humans and living organisms. Among several wastewater treatment methods, the photocatalysis approach under the umbrella of advanced oxidation processes (AOPs) offers a sustainable, inexpensive, and comprehensive treatment of emerging pharmaceutical pollutants (PEPs). Until today, amongst a variety of photocatalysts developed, graphitic carbon nitride, g-C₃N₄, (GCN), is considered a relatively low-cost, harmless, thermally stable, and to some extent visible light active (VLA) photocatalyst. Further, Biochar (BC) has emerged as an environmental friendly carbonaceous compound with good surface area, adsorption, and electrical conductivity. Hence being inspired by the characteristics of GCN and BC, a facile and captivating approach of composite photocatalysts comprising ternary components Ag, GCN, and BC is executed in the present work. The pivotal focal point is to enhance the optical absorption of GCN photocatalyst within visible light range by silver (Ag) doping strategy and boost the photogenerated charges separation by coupling with BC, both factors ultimately upsurging the photocatalytic performance. The photocatalytic performance of synthesized Ag-doped GCN/Biochar (ABCN) composite photocatalysts is assessed via the degradation of Ciprofloxacin (CIP) antibiotic, a common quinolone. The photocatalytic performance is optimized by varying the content of Ag dopant in the composite photocatalyst. The best sample 0.10-ABCN (with 10 wt% Ag content) exhibits the highest photocatalytic activity i.e. 70 % degradation of CIP (after 4 h of light irradiation), which is 3 times better than the pure GCN sample (25 %). Results from experimentation suggest that the strategy of composite photocatalyst fabrication based on the doping effect and fusing with carbonaceous material improved the photocatalytic efficiency mainly ascribed to improved optical absorbance and efficient charge separation.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"68 ","pages":"Article 108071"},"PeriodicalIF":4.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bloch-Siegert shift under a bias magnetic field along arbitrary direction","authors":"Zhichao Ding,&nbsp;Weipeng Wang","doi":"10.1016/j.rinp.2024.108085","DOIUrl":"10.1016/j.rinp.2024.108085","url":null,"abstract":"<div><div>In order to reduce the measuring error of magnetic resonance frequency caused by Bloch-Siegert shift, and improve the measurement accuracy of optical pumped alkali-metal magnetometers, the Bloch-Siegert shift is studied under a bias magnetic field in any direction. In this condition, the evolution equation of atomic spin is deduced. Based on the numerical solution of this equation, a method for extracting the Bloch-Siegert shift is proposed, which avoids the difficulty in achieving the analytical solution of the evolution equation. The numerical and analytical solutions of the evolution equation under special conditions are compared, verifying the rationality and necessity of using the numerical solution instead of approximate analytical solution to study the Bloch-Siegert shift under the bias magnetic field in any direction. By studying the Bloch-Siegert shift under different conditions, the typical conditions are selected and the Bloch-Siegert shift is numerically calculated when the bias magnetic field is in different directions. Through the analysis and verification of the calculation results, a theoretical model of the Bloch-Siegert shift under the bias magnetic field in any direction is obtained. This model is of great significance for correcting and reducing the measurement error of optical pumped alkali-metal magnetometers.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"68 ","pages":"Article 108085"},"PeriodicalIF":4.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced thermoelectric properties of bismuth telluride via Ultra-Low thermal conductivity BOSC compound addition","authors":"Nattharika Theekhasuk ,&nbsp;Nuttakrit Somdock ,&nbsp;Athorn Voraud ,&nbsp;Pichet Limsuwan ,&nbsp;Rachsak Sakdanuphab ,&nbsp;Aparporn Sakulkalavek","doi":"10.1016/j.rinp.2024.108056","DOIUrl":"10.1016/j.rinp.2024.108056","url":null,"abstract":"<div><div>This study aimed to enhance the thermoelectric properties of bismuth telluride by adding Bi₄O₄SeCl₂ (BOSC). Commercial N-type bismuth telluride was mixed with BOSC powder in varying concentrations. As the BOSC content increased, the carrier concentration also rose due to chlorine atoms acting as donor impurities. Despite this increase, the power factor values of the samples with BOSC additives did not significantly differ from those of the bare bismuth telluride sample. However, the total thermal conductivity decreased significantly with the addition of BOSC, reaching a minimum value of 0.54 W·m^–1·K^–1 at 150 °C for the sample with 1 wt% BOSC. Notably, the ZT value for the sample with 1 wt% BOSC was about 0.86, which is four times higher than that of the bare bismuth telluride sample. Our findings demonstrate superior thermoelectric performance, indicating a more efficient modification of thermoelectric properties through the addition of BOSC to the bismuth telluride matrix<strong>.</strong></div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108056"},"PeriodicalIF":4.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi focus acoustic field generation using Dammann gratings for phased array transducers","authors":"Tatsuki Fushimi ,&nbsp;Yusuke Koroyasu","doi":"10.1016/j.rinp.2024.108040","DOIUrl":"10.1016/j.rinp.2024.108040","url":null,"abstract":"<div><div>Phased array transducers can shape acoustic fields for versatile manipulation; however, generating multiple focal points typically involves complex optimization. This study demonstrates that Dammann gratings – binary phase gratings originally used in optics to generate equal-intensity spot arrays – can be adapted for acoustics to create multiple equal-strength focal points with a phased array transducer. The transducer elements were assigned phases of 0 or <span><math><mi>π</mi></math></span>, based on a Dammann grating defined by its transition points. Simulations show that simple gratings with two transition points can generate fields with up to 12 focal points of nearly equal acoustic pressures. Compared to conventional multi-focus phase optimization techniques, the Dammann grating approach offers computational efficiency and facile reconfiguration of the focal pattern by adjusting the grating hologram. We tested this approach in numerical simulations with a hypothetical high-resolution array, achieving up to 12 focal points, and validated the efficacy of the Dammann grating in a conventional 16x16 transducer array through both simulations and experiments. This comparison highlights that while Dammann gratings effectively generate multi-focus fields, the recreation ability of these gratings in a conventional array shows a lower resolution than the hypothetical array. This study underlines the potential of adapting binary phase functions from photonics to enhance ultrasound-based acoustic manipulation for tasks requiring parallel actuation at multiple points.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108040"},"PeriodicalIF":4.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring structural and electronic properties of topological insulator/graphene nano-heterostructures","authors":"Valentina Gallardo ,&nbsp;Bárbara Arce ,&nbsp;Francisco Muñoz ,&nbsp;Rodolfo San Martín ,&nbsp;Irina Zubritskaya ,&nbsp;Paula Giraldo-Gallo ,&nbsp;Caleb Z. Zerger ,&nbsp;Hari C. Manoharan ,&nbsp;Carolina Parra","doi":"10.1016/j.rinp.2024.108058","DOIUrl":"10.1016/j.rinp.2024.108058","url":null,"abstract":"<div><div>There is great interest in the study of topological insulator-based heterostructures due to expected emerging phenomena. However, a challenge of topological insulator (TI) research is the contribution of bulk conduction to the TI surface states. Both strain engineering and thickness control routes, which have been proposed to compensate for bulk doping, can be accessed through the use of nano-heterostructures consisting of topological insulator nanostructures grown on 2D materials. In this work, we report the synthesis of TI/graphene nano-heterostructures based on Bi₂Te₃ and Sb₂Te₃ nanoplatelets (NPs) grown on single-layer graphene. Various techniques were used to characterize this system in terms of morphology, thickness, composition, and crystal quality. We found that most of the obtained NPs are mainly &lt;30 nm thick with thickness-dependent crystal quality, observed by Raman measurements. Thinner NPs (1 or 2 quintuple layers) tend to replicate the topography of the underlying single-layer graphene, according to roughness analysis. Finally, we show preliminary studies of their band structure obtained by Low Temperature Scanning Tunneling Microscopy, Scanning Tunneling Spectroscopy, and by Density Functional Theory. We observe a highly negative E_D value which can be attributed to the presence of defects.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108058"},"PeriodicalIF":4.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Beyond two-octave coherent OAM supercontinuum generation in air-core Ge-doped ring fiber","authors":"Xiaoke Wu ,&nbsp;Pengfei Wang ,&nbsp;Yiwen Zhang ,&nbsp;Jian Yang ,&nbsp;Yuanpeng Liu ,&nbsp;Wenpu Geng ,&nbsp;Fei Yang ,&nbsp;Zhongqi Pan ,&nbsp;Yang Yue","doi":"10.1016/j.rinp.2024.108063","DOIUrl":"10.1016/j.rinp.2024.108063","url":null,"abstract":"<div><div>Orbital angular momentum (OAM) has emerged as a revolutionary technology for communication networks due to its ability to significantly increase the channel capacity. However, traditional optical fibers present significant hurdles to harnessing OAM’s full potential, including dispersion and limited bandwidth, which facilitates investigations on supercontinuum (SC) generation for OAM beams. In this paper, an air-core Ge-doped ring fiber is proposed and designed to support high-order OAM mode up to |<em>l</em>| = 24. To achieve this, the fiber has a high refractive index difference between the ring core and the cladding, enabling stable transmission of high-order OAM modes. A key feature of this design is the OAM₂₄_,₁ mode, which exhibits near-zero and flat dispersion. This characteristic translates into high coherence and a remarkably broad SC generation. The generated SC spans over two octaves (2336 nm) within the infrared wavelength range (764 nm to 3100 nm) at a power level of −40 dB. Furthermore, by optimizing the structural parameters, we ensure near-zero and flat dispersion characteristics for the other OAM modes (|<em>l</em>| &lt; 24), along with broad SC generation exceeding two octaves. This fiber design holds significant promise for future advancements in OAM beam transmission within the infrared spectrum.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"67 ","pages":"Article 108063"},"PeriodicalIF":4.4,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}