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Journal of Contemporary Physics (Armenian Academy of Sciences)最新文献

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Photoinduced Local Lattice Vibrations in a Ruby Crystal under Optical Pumping of the 2T1 State 红宝石晶体在 2T1 态光学泵浦下的光诱导局部晶格振动
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040035
V. S. Arakelyan
{"title":"Photoinduced Local Lattice Vibrations in a Ruby Crystal under Optical Pumping of the 2T1 State","authors":"V. S. Arakelyan","doi":"10.1134/S1068337223040035","DOIUrl":"10.1134/S1068337223040035","url":null,"abstract":"<p>The oscillatory behavior of a heavy substitutional impurity (Cr<sup>3+</sup>) in Al<sub>2</sub>O<sub>3</sub> has been studied by the Brillouin scattering method. The oscillations of chromium ions are carried out by their photoexcitation. Discrete shifts of the ruby luminescence lines <i>R</i><sub>1</sub> and <i>R</i><sub>2</sub> at room temperature depending on the absorbed laser pump power upon excitation of the <sup>2</sup><i>T</i><sub>1</sub> state observed for the first time. These shifts are caused by the excitation of quasi-local vibrations of chromium ions. The frequency of quasi-local oscillations is equal to 22 GHz, which corresponds to transverse acoustic oscillations in ruby. An explanation of the observed phenomenon is given based on the Born–Oppenheimer adiabatic approximation and the Pekar function.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"369 - 374"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Narrow-Band Terahertz Pulse Generation in Lithium Niobate Crystal Using Phase Mask 利用相位掩膜在铌酸锂晶体中产生窄带太赫兹脉冲
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040047
Y. H. Avetisyan, A. H. Makaryan
{"title":"Narrow-Band Terahertz Pulse Generation in Lithium Niobate Crystal Using Phase Mask","authors":"Y. H. Avetisyan,&nbsp;A. H. Makaryan","doi":"10.1134/S1068337223040047","DOIUrl":"10.1134/S1068337223040047","url":null,"abstract":"<p>Below, we theoretically study the generation of narrowband terahertz (THz) radiation by optical rectification in an artificial periodically poled lithium niobate (LN) crystal with a wide aperture. The latter is formed by placing a multi-slit phase mask in front of a conventional (single-domain) LN crystal. It is shown that the bandwidth of THz generation can be varied over a wide range by changing the linear size of the pump beam in the crystal. In addition, it is possible to tune up the generation frequency in the range of 0.4–0.8 THz by building a mask image in the crystal with different magnifications. According to estimates, the energy of narrowband THz pulses at a frequency of 0.5 THz in a stoichiometric LN crystal at a temperature of 100 K is about 265 μJ for a pump pulse energy of 220 mJ.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"362 - 368"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microwave–Assisted Synthesis of SiO2/ZnO Photocatalyst with Core-Shell Structure 微波辅助合成具有核壳结构的 SiO2/ZnO 光催化剂
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040163
A. A. Sargsyan, R. A. Mnatsakanyan, T. V. Grigoryan, A. A. Kazaryan, A. A. Petrosyan, V. V. Harutyunyan, A. O. Badalyan, N. R. Aghamalyan, V. V. Baghramyan
{"title":"Microwave–Assisted Synthesis of SiO2/ZnO Photocatalyst with Core-Shell Structure","authors":"A. A. Sargsyan,&nbsp;R. A. Mnatsakanyan,&nbsp;T. V. Grigoryan,&nbsp;A. A. Kazaryan,&nbsp;A. A. Petrosyan,&nbsp;V. V. Harutyunyan,&nbsp;A. O. Badalyan,&nbsp;N. R. Aghamalyan,&nbsp;V. V. Baghramyan","doi":"10.1134/S1068337223040163","DOIUrl":"10.1134/S1068337223040163","url":null,"abstract":"<p>The SiO<sub>2</sub>/ZnO nanocomposite with a core-shell structure for photocatalysis from water-soluble zinc salts and sodium silicate was synthesized using the hydrothermal-microwave method. The physicochemical properties of the synthesized SiO<sub>2</sub>/ZnO were studied and its photocatalytic activity was tested. The band gaps of the heat-treated composite <span>(E_{{text{g}}}^{{{text{dir}}}})</span> and <span>(E_{{text{g}}}^{{{text{indir}}}})</span> are 3.35 and 3.32 eV, respectively. The photocatalytic activity of the resulting SiO<sub>2</sub>/ZnO was determined by the decomposition reaction of methylene blue under UV irradiation. The conversion of methylene blue was determined by optical method. The resulting SiO<sub>2</sub>/ZnO has high photocatalytic activity. The conducted studies showed the effectiveness of microwave synthesis of SiO<sub>2</sub>/ZnO with a core-shell structure in comparison with traditional methods.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"397 - 404"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Helical Vacuum Currents for a Scalar Field in Models with Nontrivial Spatial Topology 无空间拓扑模型中标量场的螺旋真空电流
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040151
A. A. Saharian, D. H. Simonyan, H. H. Mikayelyan, A. A. Vantsyan
{"title":"Helical Vacuum Currents for a Scalar Field in Models with Nontrivial Spatial Topology","authors":"A. A. Saharian,&nbsp;D. H. Simonyan,&nbsp;H. H. Mikayelyan,&nbsp;A. A. Vantsyan","doi":"10.1134/S1068337223040151","DOIUrl":"10.1134/S1068337223040151","url":null,"abstract":"<p>The vacuum expectation value of the current density for a massive scalar field in a (D + 1)-dimensional flat space-time with compact dimension is investigated. Along a compact dimension, the field operator obeys the helical quasiperiodicity condition with a constant phase. The results previously studied in the literature are obtained in the special case of a zero helicity parameter. In contrast to this case, the vacuum current, in addition to the component along the compact dimension, has a non-zero component in the direction of the non-compact dimension along which the field operator is shifted. A simple relation between these components is obtained. They are odd periodic functions of magnetic flux penetrating the compact dimension, with the period equal to the magnetic flux quantum. For a given non-zero value of the helicity parameter, the component of the vacuum current along the compact dimension tends to zero in the limit when the length of that dimension tends to zero. In the problem considered earlier with the usual quasiperiodic condition, the vacuum current diverges in that limit.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"341 - 348"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vacuum Window for IBA C18 Twin Cyclotron’s Beamline 用于 IBA C18 双回旋加速器光束线的真空窗
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040217
A. A. Manukyan
{"title":"Vacuum Window for IBA C18 Twin Cyclotron’s Beamline","authors":"A. A. Manukyan","doi":"10.1134/S1068337223040217","DOIUrl":"10.1134/S1068337223040217","url":null,"abstract":"<p>This article provides data on the development and creation of a vacuum window module, which will bring out the proton beam of the C18 cyclotron (IBA, Belgium) with energy of 18 MeV from a vacuum environment into the atmosphere. The module is made of aluminum and consists of a flange with a collimator and a helium (He) chamber of foil plates cooling. The module was installed at the end of the cyclotron’s beam line. Profile measurements were made for various current values of proton beam from 1 to 30 µA. The vacuum window showed its functionality.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"441 - 444"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of a Drone in the On-Site Antenna Measurements of the Radar of an Ultrashort Meter Waveband 无人机在超短波波段雷达现场天线测量中的应用
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040114
M. V. Markosyan, A. H. Avetisyan, A. K. Aharonyan, H. G. Martirosyan, E. A. Harutyunyan, G. Z. Sughyan, R. A. Davtyan
{"title":"Application of a Drone in the On-Site Antenna Measurements of the Radar of an Ultrashort Meter Waveband","authors":"M. V. Markosyan,&nbsp;A. H. Avetisyan,&nbsp;A. K. Aharonyan,&nbsp;H. G. Martirosyan,&nbsp;E. A. Harutyunyan,&nbsp;G. Z. Sughyan,&nbsp;R. A. Davtyan","doi":"10.1134/S1068337223040114","DOIUrl":"10.1134/S1068337223040114","url":null,"abstract":"<p>The use of a drone as an aerial vehicle to realize the antenna measurement method is considered. The drone is controlled by software, using unified radio-electronic equipment containing a transmitter, a half-wave vibrator, and a GPS navigator. The parameters of the directional properties of the antenna system are the result of software processing of the output signals of the radar receiver synchronized with the coordinates of the drone flight path points.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"422 - 427"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Platinum-Containing Detection Pixel of a Thermoelectric Single-Photon Detector 热电单光子探测器的含铂检测像素
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040102
A. A. Kuzanyan, V. R. Nikoghosyan, A. S. Kuzanyan
{"title":"Platinum-Containing Detection Pixel of a Thermoelectric Single-Photon Detector","authors":"A. A. Kuzanyan,&nbsp;V. R. Nikoghosyan,&nbsp;A. S. Kuzanyan","doi":"10.1134/S1068337223040102","DOIUrl":"10.1134/S1068337223040102","url":null,"abstract":"<p>Using computer simulation, the processes of heat propagation were studied and noise was determined in a three-layer detection pixel of a thermoelectric single-photon detector, consisting of an absorber (Pt), a thermoelectric sensor (La<sub>0.99</sub>Ce<sub>0.01</sub>B<sub>6</sub>) and a heat sink (Pt, Mo). The absorption of photons with energies of 0.8–7.1 eV (1550–175 nm) in absorbers of various thicknesses, providing high absorption efficiency, was studied. The simulation was based on the heat propagation equations from a limited volume. The temporal dependencies of the signal appearing on the sensor were studied. Signal power, noise equivalent power, and signal-to-noise ratio were determined. It was shown that a detection pixel with a platinum absorber can reliably detect single photons with the energy of 3.1–7.1 eV.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"415 - 421"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On Modernization of the LEE-75 Linear Electron Accelerator of the AANL (YerPhI) 关于美国国家实验室（AANL）LEE-75 直线电子加速器的现代化（YerPhI
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040187
L. R. Vahradyan
{"title":"On Modernization of the LEE-75 Linear Electron Accelerator of the AANL (YerPhI)","authors":"L. R. Vahradyan","doi":"10.1134/S1068337223040187","DOIUrl":"10.1134/S1068337223040187","url":null,"abstract":"<p>Briefly presented the scientific and technical state of the linear accelerator complex of the A. Alikhanyan National Scientific Laboratory. LUE-75 after renovation work carried out in recent years. The need for further modernization of the accelerator’s main systems to ensure its long scientific life is substantiated. An analysis of the state of individual nodes and systems of the accelerator and calculations have been carried out, based on which modernization is proposed by the introduction of modern technology. The use of new-generation power electronics, vacuum equipment with a modern interface, and a thermostabilization system is offered.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"333 - 340"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pair-Interacting Heavy Holes Gas in a Strongly Prolate Ellipsoidal Quantum Dot: Thermodynamic Properties 强椭球量子点中的成对相互作用重空穴气体：热力学性质
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040126
M. A. Mkrtchyan, Y. S. Mamasakhlisov, H. A. Sarkisyan
{"title":"Pair-Interacting Heavy Holes Gas in a Strongly Prolate Ellipsoidal Quantum Dot: Thermodynamic Properties","authors":"M. A. Mkrtchyan,&nbsp;Y. S. Mamasakhlisov,&nbsp;H. A. Sarkisyan","doi":"10.1134/S1068337223040126","DOIUrl":"10.1134/S1068337223040126","url":null,"abstract":"<p>A somewhat partial pair-interacting gas of heavy holes localized in a highly elongated ellipsoidal Ge/Si quantum dot has been studied in the adiabatic approximation. The interparticle interaction potential is considered within the one-dimensional Moshinsky atom model when the interaction depends on the square of the distance between particles. Within the framework of the Boltzmann approximation, the statistical sum of a somewhat partial hole gas is analytically calculated. The main thermodynamic parameters of the system, such as average energy, free energy, entropy, and heat capacity have been investigated. It is shown that taking into account interparticle interaction results in the ordering of the system, which, in particular, affects the entropy of the gas.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"391 - 396"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Formation of Luminescence Bands of Ce3+ Ions in YAG:Ce Crystals YAG:Ce 晶体中 Ce3+ 离子发光带的形成
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040084
T. I. Butaeva, K. L. Hovhannesyan, A. V. Yeganyan
{"title":"Formation of Luminescence Bands of Ce3+ Ions in YAG:Ce Crystals","authors":"T. I. Butaeva,&nbsp;K. L. Hovhannesyan,&nbsp;A. V. Yeganyan","doi":"10.1134/S1068337223040084","DOIUrl":"10.1134/S1068337223040084","url":null,"abstract":"<p>The spectral features and structural factors influencing the formation of luminescence bands of Ce<sup>3+</sup> ions in YAG:Ce crystals are considered. The energy levels of the 4<i>f</i> shell of Ce<sup>3+</sup> ions occupying both dodecahedral and octahedral sites of the crystal lattice have been determined<i>.</i> The participation of Ce<sup>3+</sup> ions and <span>({text{Ce}}_{{{text{Al}}}}^{{3 + }})</span> ions in the structure of the luminescence band was shown and the multicenter structure of Ce<sup>3+</sup> ions in the 4<i>f</i> ↔ 5<i>d</i> transitions of the activator was determined.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"378 - 384"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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