Bulletin of the Lebedev Physics Institute最新文献_第6页

Comparative Analysis of the Efficiency of Different Photoabsorption Channels of NeAr+ Molecular Ions Associated with Transitions to the ArNe+ State

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602425

V. S. Lebedev, A. A. Narits, K. S. Kislov

{"title":"Comparative Analysis of the Efficiency of Different Photoabsorption Channels of NeAr+ Molecular Ions Associated with Transitions to the ArNe+ State","authors":"V. S. Lebedev, A. A. Narits, K. S. Kislov","doi":"10.3103/S1068335624602425","DOIUrl":"10.3103/S1068335624602425","url":null,"abstract":"The processes of continuous photoabsorption by weakly bound NeAr+ molecular ions at room and elevated temperatures have been theoretically investigated. A comparative analysis of the relative contributions of four types of phototransitions (photodissociation, bound-bound transitions, free-free transitions and photoassociation) with different initial and final states of internuclear motion to the total absorption coefficient at room and elevated temperatures was made. It is shown that it is possible to describe under certain assumptions the above contributions under quasi-equilibrium conditions without resorting to direct calculation of photoabsorption coefficients for each of the channels. It is demonstrated that the relative efficiencies of different types of phototransitions in the NeAr+ ion radically differ from previous results for homonuclear noble gas ions and for ArXe+ and KrXe+ ions. The dependences of these contributions on the wavelength of the incident radiation and on the gas temperature of the plasma were investigated. It was found that there are well-defined regions corresponding to the predominance of a particular channel of phototransitions within the wavelength range where efficient absorption occurs. The presented results are of interest for the construction of kinetic models of pumping and excitation relaxation in gas lasers based on active media containing Ne/Ar mixtures.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S762 - S774"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108099","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

Analysis of Extinction Spectra and Near-Field Electromagnetic Coupling Regimes for Plexcitonic Nanoparticles in the Coupled Oscillator Model

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602279

S. S. Moritaka, V. S. Lebedev

{"title":"Analysis of Extinction Spectra and Near-Field Electromagnetic Coupling Regimes for Plexcitonic Nanoparticles in the Coupled Oscillator Model","authors":"S. S. Moritaka, V. S. Lebedev","doi":"10.3103/S1068335624602279","DOIUrl":"10.3103/S1068335624602279","url":null,"abstract":"We have performed a theoretical analysis of the extinction spectra of light in hybrid plasmon–exciton nanosystems. Within the framework of the quasistatic approximation, an analytical formula is derived that explicitly defines the dependence of the effective cross section of light extinction by a system of coupled oscillators on their eigenfrequencies and damping constants as well as on the coupling constant and the frequency of the incident light. The theory has been applied to the analysis of light absorption by specific plasmon–exciton nanosystems. These systems consist of a spherical and rod-shaped metal core coated with an outer layer of an isotropic molecular aggregate of a dye. We have shown that the results of the work can be used for quantitative interpretation of the available experimental data on the light extinction spectra in the regimes of weak and strong plasmon–exciton coupling. Studying the effects of plasmon–exciton coupling is of particular interest for the development of hybrid nanowaveguides, highly sensitive photodetectors, and optical sensors.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S750 - S761"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108100","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

Optothermal Traps Based on Mosaic Phase Masks

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602413

S. P. Kotova, N. N. Losevsky, A. M. Mayorova, S. A. Samagin

引用次数: 0

Light Pressure on a Spherical Particle in the Interference Field of Two Monochromatic Bessel Beams

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602437

D. V. Guzatov

{"title":"Light Pressure on a Spherical Particle in the Interference Field of Two Monochromatic Bessel Beams","authors":"D. V. Guzatov","doi":"10.3103/S1068335624602437","DOIUrl":"10.3103/S1068335624602437","url":null,"abstract":"General analytical expressions are derived for the light pressure force that acts on a spherical particle of arbitrary size and material composition (dielectric, metal) located in the interference field of two arbitrary monochromatic vector Bessel beams. For identical beams on orders of m = 0 and 1, the light pressure force is examined for the case of two parallel and copropagating beams and the case of intersection of the beam axes near a dielectric particle. It is shown that the presence of interference leads to a complex motion of a particle located in a plane perpendicular to the parallel beams. It is also demonstrated that with a change in the angle formed by the intersection of the axes of Bessel beams in the center of the particle, the light pressure force changes nonmonotonically, passing through maxima and minima, the number of which increases with increasing particle size. When the particle is displaced from the intersection point of the axes along a straight line located symmetrically between the beams, the light pressure force oscillates with a change in sign and with a gradually decreasing amplitude.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S775 - S788"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108098","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

Efficient Laser Acceleration of Electrons and Ions from Targets with Controlled Preplasma

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602127

A. V. Brantov, M. A. Rakitina, S. I. Glazyrin

引用次数: 0

Measurements of the Spectral Characteristics of the Laser-Plasma Sources Using Thermoluminescent Detectors

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602310

K. A. Ivanov, G. Kh. Salakhutdinov, A. I. Sivko, I. N. Tsymbalov, I. G. Grigor’eva, I. A. Busygina, A. A. Rupasov, P. V. Moskvich, R. V. Volkov, A. B. Savel’ev

{"title":"Measurements of the Spectral Characteristics of the Laser-Plasma Sources Using Thermoluminescent Detectors","authors":"K. A. Ivanov, G. Kh. Salakhutdinov, A. I. Sivko, I. N. Tsymbalov, I. G. Grigor’eva, I. A. Busygina, A. A. Rupasov, P. V. Moskvich, R. V. Volkov, A. B. Savel’ev","doi":"10.3103/S1068335624602310","DOIUrl":"10.3103/S1068335624602310","url":null,"abstract":"A method of wide-range X-ray and electron spectrometry of plasma formed by a femtosecond laser pulse with a peak intensity of over 1018 W/cm2 on the surface of a solid-state target is experimentally considered. Measurements of a flow of charged particles and quanta were carried out using thermoluminescent detectors based on LiF(Mg, Ti) that accumulate a dose, in front of which magnets were additionally installed to isolate the X-ray component. The spectra were obtained on the basis of the method for determining the accumulated dose of a detector depending on the thickness of the filter installed in front of it. The data have been restored in the range from 10 keV to several megaelectronvolts. The “temperatures” of the hot electron components of laser plasma have been determined, which are 160 and 1500 keV and may be related to the effects of particle acceleration in the dense-plasma region, as well as the temperatures during propagation of radiation in a cloud of subcritical density.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 9 supplement","pages":"S720 - S727"},"PeriodicalIF":0.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108229","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

Spaser with a Three-Level Active Medium Based on a Layered Cylinder

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602401

T. M. Chmereva, M. G. Kucherenko, F. Yu. Mushin

引用次数: 0

Investigation of the Effect of Background Plasma Parameters on Efficient Generation of Alfvén Waves Produced by Laser Plasma Bunches at Mach Numbers MA = 0.2

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-04 DOI: 10.3103/S1068335624602176

A. G. Berezutsky, V. N. Tishchenko, I. B. Miroshnichenko, S. S. Sharipov, A. A. Chibranov, Yu. P. Zakharov, I. F. Shaikhislamov

引用次数: 0

Dual-Functional Material for Tunable Color Optical Thermometry: Er3+/Yb3+ Co-Doped Lu2Ge2O7 Emitting Red and Green Light under 980 nm/1550 nm Excitation

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-02 DOI: 10.3103/S1068335624600840

Shengyi Liu, Duan Gao, Li Wang, Wenbin Song, Ying Zhu, Peijia Xiao, Long Cheng, Jiajun Shen

{"title":"Dual-Functional Material for Tunable Color Optical Thermometry: Er3+/Yb3+ Co-Doped Lu2Ge2O7 Emitting Red and Green Light under 980 nm/1550 nm Excitation","authors":"Shengyi Liu, Duan Gao, Li Wang, Wenbin Song, Ying Zhu, Peijia Xiao, Long Cheng, Jiajun Shen","doi":"10.3103/S1068335624600840","DOIUrl":"10.3103/S1068335624600840","url":null,"abstract":"While rare-earth ions have found extensive applications as dopants in up-conversion luminescent materials across various fields, empirical observations reveal distinct influences of different dopants on diverse substances. In light of this, we successfully synthesized dual-mode excitation Lu2Ge2O7 up-conversion phosphors doped with Yb3+/Er3+ ions (Lu2Ge2O7 : Yb3+/Er3+). These phosphors are designed to exhibit two distinct emission colors, green and red, under excitation at 980 or 1550 nm. Our research delves into a comprehensive analysis of the potential up-conversion mechanisms, considering different excitation sources at wavelengths of 980 and 1550 nm. Our results unambiguously demonstrate that doping with Er3+ and Yb3+ ions can alter the optical properties of Lu2Ge2O7, resulting in the tunable color and optical thermometry capabilities. This material exhibits promising prospects in diverse fields such as fluorescent anti-counterfeiting and temperature sensing.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 12","pages":"519 - 528"},"PeriodicalIF":0.6,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108198","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

The Influence of Spin-Orbit Coupling on the Efficiency of Optical Transitions in NeAr+ Molecular Ion

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2025-02-02 DOI: 10.3103/S1068335624602152

A. A. Narits

引用次数: 0