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Temporal Response of MSM-LED Optical Integrated Device MSM-LED光集成器件的时间响应
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2011-03-29 DOI: 10.1155/2011/756758
S. Eladl, M. Ashour
{"title":"Temporal Response of MSM-LED Optical Integrated Device","authors":"S. Eladl, M. Ashour","doi":"10.1155/2011/756758","DOIUrl":"https://doi.org/10.1155/2011/756758","url":null,"abstract":"The temporal response of an optical integrated device is theoretically analysed. The device is composed of a Metal-Semiconductor-Metal (MSM) Photodetector and a Light Emitting Diode (LED). The analysis is based on the frequency response of the constituent devices without any optical feedback within the device structure. All expressions describing the frequency response, time response, output derivatives, and rise time are outlined. The results show that the temporal response of MSM detectors is similar to the LED response if the cutoff frequency of the LED is lower than that of MSM, while it is similar to MSM detector if the cutoff frequency of the MSM is lower than that of LED.","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"91 9 1","pages":"73-82"},"PeriodicalIF":0.0,"publicationDate":"2011-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89853083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photoionization Processes of the Single-Ionized Boron 单电离硼的光离过程
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2011-03-13 DOI: 10.1155/2011/452026
Ju-Tang Hsiao, H. Sun, Shenglu Lin, Keh-Ning Huang
{"title":"Photoionization Processes of the Single-Ionized Boron","authors":"Ju-Tang Hsiao, H. Sun, Shenglu Lin, Keh-Ning Huang","doi":"10.1155/2011/452026","DOIUrl":"https://doi.org/10.1155/2011/452026","url":null,"abstract":"The relativistic calculations of the cross-section , the angular-distribution parameter , and spin-polarization parameters of photoelectrons using the multiconfiguration relativistic random-phase approximation theory for the photoionization of the ion are presented. Precise energies and widths of all five Rydberg series of doublyexcited states , , , , and are determined. Our predictions are in very close agreement with experiments and are consistent with other calculations.","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"89 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2011-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86855204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Concentration and Annealing Effects on Luminescence Properties of Ion-Implanted Silica Layers 浓度和退火对离子注入二氧化硅层发光性能的影响
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2011-02-06 DOI: 10.1155/2011/326368
R. Salh
{"title":"Concentration and Annealing Effects on Luminescence Properties of Ion-Implanted Silica Layers","authors":"R. Salh","doi":"10.1155/2011/326368","DOIUrl":"https://doi.org/10.1155/2011/326368","url":null,"abstract":"The development of optoelectronic or even photonic devices based on silicon technology is still a great challenge. Silicon and itsoxide do not possess direct optical transitions and, therefore, are ...","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"118 1","pages":"326368"},"PeriodicalIF":0.0,"publicationDate":"2011-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73686179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Nonresonant Cross-Section, Fano-Shape Parameter and Correlation Coefficient for the Photoionization of 2s2p () in Heliumlike 类氦中2s2p()光离的非共振截面、fano形参数和相关系数
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2011-01-16 DOI: 10.1155/2011/696382
Aliou Niane, N. Faye, A. S. Ndao, A. Konté
{"title":"Nonresonant Cross-Section, Fano-Shape Parameter and Correlation Coefficient for the Photoionization of 2s2p () in Heliumlike","authors":"Aliou Niane, N. Faye, A. S. Ndao, A. Konté","doi":"10.1155/2011/696382","DOIUrl":"https://doi.org/10.1155/2011/696382","url":null,"abstract":"The nonresonant cross-section, Fano-shape parameter and coefficient parameter have been calculated for the photoionization of helium and heliumlike under the threshold of the residual ions. Dipole matrix elements which correspond to the transitions from to state and from state to continuum state 1sp () were determined by choosing, for the ground state, the six-parameter Hylleraas wave function including electron correlation effects and a completely screened Coulomb wave function for the continuum. Energies and widths have been determined in the diagonalization method. The results are compared with available results obtained by other theoretical approaches.","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"33 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2011-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75062751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Double Photoionization of Endohedrally Confined Atoms 腔内受限原子的双光离
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2011-01-01 DOI: 10.1155/2011/817034
F. D. Colavecchia, G. Gasaneo, D. Mitnik
{"title":"Double Photoionization of Endohedrally Confined Atoms","authors":"F. D. Colavecchia, G. Gasaneo, D. Mitnik","doi":"10.1155/2011/817034","DOIUrl":"https://doi.org/10.1155/2011/817034","url":null,"abstract":"We study the double electronic emission by photon impact from ground state of two-electron atoms in the center of a model spherical fullerene, which is described by a square-well shell. Cross-sections for different well depth are computed within a separable model for the final state, and a configuration interaction state for the initial one. Triple differential cross-sections show a strong dependence on the well depth and on the energy of the emitted electrons, due to the delocalization of the electrons in the initial state. The fullerene potential also allows higher angular momenta partial waves to be included in the process, which modifies the well-known two-lobe cross-section from isolated atom.","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"10 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90307117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Comparative Study of Pure and Doped Single Crystals of Lead Iodide Dihydrate and Lead Tartrate Dihydrate Grown in Silica Gel Using Fourier Transform Raman Spectra 用傅立叶变换拉曼光谱研究纯和掺杂二水合碘化铅和酒石酸铅在硅胶中生长的单晶
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2010-09-16 DOI: 10.1155/2010/265403
G. Lillybai, M. H. Rahimkutty
{"title":"Comparative Study of Pure and Doped Single Crystals of Lead Iodide Dihydrate and Lead Tartrate Dihydrate Grown in Silica Gel Using Fourier Transform Raman Spectra","authors":"G. Lillybai, M. H. Rahimkutty","doi":"10.1155/2010/265403","DOIUrl":"https://doi.org/10.1155/2010/265403","url":null,"abstract":"It is presented the FT-Raman spectroscopic investigation of the lead tartrate dihydrate and lead iodide dihydrate.The difference in the spectroscopic behavior of these salts were found which can be attributed to a different geometry of the tartrate and iodide ions. The structural differences between the coordination environments of lead atoms are discussed in connection with Raman frequencies. The compounds have been synthesized using sodium metasilicate gel at ordinary temperature and pressure.","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"42 5","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2010-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72584901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Distorted Wave Theories Applied to Double Ionization by Ion Impact: Simulation of Higher-Order Processes 应用于离子撞击双电离的畸变波理论:高阶过程的模拟
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2010-06-14 DOI: 10.1155/2010/231329
M. F. Ciappina, T. Kirchner, M. Schulz, D. Fischer, R. Moshammer, J. Ullrich
{"title":"Distorted Wave Theories Applied to Double Ionization by Ion Impact: Simulation of Higher-Order Processes","authors":"M. F. Ciappina, T. Kirchner, M. Schulz, D. Fischer, R. Moshammer, J. Ullrich","doi":"10.1155/2010/231329","DOIUrl":"https://doi.org/10.1155/2010/231329","url":null,"abstract":"One of the goals in studies of double ionization (DI) of simple atoms by electron\u0000or ion impact is to elucidate and assess the different mechanisms that lead to this\u0000atomic process. In this work we present an attempt to model the mechanisms beyond\u0000the first order in DI of helium by highly charged projectiles. To this end we\u0000employ the continuum distorted wave-eikonal initial state (CDW-EIS) formalism\u0000joint with a Monte Carlo event generator (MCEG). The MCEG allows us to generate\u0000theoretical event files that represent the counterpart of the data obtained from\u0000a kinematically complete experiment. Starting from these event files, a new data\u0000analysis tool used to contrast theory and experiment in DI, the four-body Dalitz\u0000plots, is easily produced. The higher order mechanisms are simulated by considering\u0000DI as a sequential process: a single ionization of a helium atom as a first step and\u0000another single ionization of a single-charged helium ion as a second step. Some of\u0000the features in the experimental data are very well reproduced by these simulations.","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"18 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2010-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87589891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Distorted-Wave Born Approach for Calculating Electron-Impact Ionization of Molecules 计算分子电子碰撞电离的畸变波玻恩方法
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2010-03-29 DOI: 10.1155/2010/367180
D. Madison, O. Al-Hagan
{"title":"The Distorted-Wave Born Approach for Calculating Electron-Impact Ionization of Molecules","authors":"D. Madison, O. Al-Hagan","doi":"10.1155/2010/367180","DOIUrl":"https://doi.org/10.1155/2010/367180","url":null,"abstract":"The distorted-wave Born approximation (DWBA) has been one of the most successful theoretical approaches for treating electron collisions with complicated atoms, and recently the DWBA has been successfully extended to treat electron-impact ionization of molecules. The purpose of this paper is to give an overview of that development and to provide a summary of the recent experimental and theoretical works examining low to intermediate energy electron-impact single ionization of molecules.","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"99 1","pages":"1-24"},"PeriodicalIF":0.0,"publicationDate":"2010-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74481098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 68
The Kerr Nonlinearity in an N-Type Four-Level System via Spontaneously Generated Coherence 基于自发相干的n型四能级系统的Kerr非线性
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2009-10-26 DOI: 10.1155/2009/382764
Yingjie Du, K. Jin, Junxiang Zhang
{"title":"The Kerr Nonlinearity in an N-Type Four-Level System via Spontaneously Generated Coherence","authors":"Yingjie Du, K. Jin, Junxiang Zhang","doi":"10.1155/2009/382764","DOIUrl":"https://doi.org/10.1155/2009/382764","url":null,"abstract":"The Kerr nonlinearity is investigated in an N-type four-level atomic system whose both supper levels are degenerated or nearly degenerate. It is found that the spontaneously generated coherence as a result of the degenerate levels can change the Kerr nonlinearity dramatically depending on the angle between two spontaneous channels. In addition, we discover that the probe field makes its own contribution to the nonlinearity in comparison to indifference in general three-level systems.","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"9 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2009-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83515824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Fragility of Bioprotectant Glass-Forming Systems in Extremophiles 极端微生物生物保护剂玻璃形成系统的脆弱性
Journal of Atomic, Molecular, and Optical Physics Pub Date : 2009-06-04 DOI: 10.1155/2009/638063
S. Magazù, F. Migliardo
{"title":"Fragility of Bioprotectant Glass-Forming Systems in Extremophiles","authors":"S. Magazù, F. Migliardo","doi":"10.1155/2009/638063","DOIUrl":"https://doi.org/10.1155/2009/638063","url":null,"abstract":"A central issue in the adaptation of proteins and enzymes to extreme conditions is the conservation of their functional state, which is characterized by a well-balanced compromise of stability and flexibility.In this review work an overview of elastic neutron scattering (ENS) findings on a class of bioprotectant glass-forming systems, such as trehalose and its homologous (maltose and sucrose) water mixtures, is presented as a function of temperature and concentration. ENS, in fact, allows to determine some remarkable quantities in order to characterize the correlation among dynamical properties, the flexibility and fragility of biomolecules. The experimental results have pointed out a dynamical transition, which shows a crossover in molecular fluctuations between harmonic and anharmonic dynamical regimes. The ENS findings allow to characterize both the trehalose rigidity and flexibility, which are strictly connected to its superior bioprotective effectiveness. In this frame the lowest flexibility and fragility character of trehalose/ <path id=\"x48\" d=\"M729 650v-28q-62 -5 -76 -19.5t-14 -75.5v-404q0 -62 13.5 -76t75.5 -19v-28h-268v28q65 5 79.5 19t14.5 76v199h-341v-199q0 -62 14 -76t76 -19v-28h-263v28q61 5 74.5 19t13.5 76v404q0 62 -14 76t-76 19v28h259v-28q-58 -5 -71 -19t-13 -76v-162h341v162\u0000q0 61 -13.5 75.5t-72.5 19.5v28h261z\" /> mixture with respect to maltose and sucrose/ mixtures indicate a better attitude to encapsulate biostructures in more rigid and temperature insensitive structures in approaching the glass transition.","PeriodicalId":15042,"journal":{"name":"Journal of Atomic, Molecular, and Optical Physics","volume":"117 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2009-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73342554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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