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Relativistic Channel Theory: Abnormal Fine Structures of n^(2)D Rydberg States for Alkali Atoms

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Chinese physics Letters 2001年第10期18卷 1334-1336页

作者： XIA Dan LI Jia-Ming center for atomic and molecular nanosciences Department of PhysicsTsinghua UniversityBeijing 100084 Institute of physics:Chinese Academy of Sciences Beijing 100080

Based on relativistic channel theory, we have studied the fine structures of n^(2)D Rydberg states for alkali atoms. We explain the abnormal fine structures owing to the competition effect of the spin-orbit interactio... 详细信息

关键词： Rydberg relativistic Alkali

Optimum Metallic-Bond Scheme: A Quantitative Analysis of Mass Spectra of Sodium Clusters

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Chinese physics Letters 2001年第12期18卷 1575-1577页

作者： SU Chang-Rong LI Jia-Ming department of physics Center for Atomic and Molecular NanosciencesTsinghua UniversityBeijing 100084 Institute of physics Chinese Academy of SciencesBeijing 100080

Based on the results of the optimum metallic-bond scheme for sodium clusters, we present a quantitative analysis of the detailed features of the mass spectra of sodium clusters. We find that, in the generation of sodium clusters with various abundances, the quasi-steady processes through adding or losing a sodium atom dominate. The quasi-steady processes through adding or losing a sodium dimer are also important to understand the detailed features of mass spectra for small clusters.

关键词： adding quasi spectra

Highest Occupied molecular Orbital of Cyclopentanone by Binary （e, 2e） Spectroscopy

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Chinese physics Letters 2006年第3期23卷 583-586页

作者：张书锋宁传刚邓景康任雪光苏国林杨铁成黄艳茹 department of physics and Key Laboratory of atomic and molecular nanosciences of MOE Tsinghua University Beijing 100084

We report the first measurements of the momentum profiles of highest occupied molecular orbital （HOMO） and the complete valence shell binding energy spectra of cyclopentanone with impact energies of 600 and 1200 eV by a binary （e, 2e） spectrometer. The experimental momentum profiles of the HOMO orbital are compared with the theoretical momentum distribution calculated using the Hartree Fock and density functional theory methods with various basis sets. However, none of these calculations gives a completely satisfactory description of the momentum distributions of the HOMO 762. The inadequacy of the calculations could result in the intensity difference of the second maximum at p-1.2a.u. between the experiment and the theory. The discrepancy between experimental and theoretical data in the low-momentum region is explained with the distorted wave effect.

关键词： ELECTRON MOMENTUM SPECTROSCOPY SPECTROMETER HYDROGEN SPECTRA DENSITY

Interpretation of the Experimental Electron Momentum Spectra of 5e1/2 and 5e3/2 Orbitals of CF3I with Relativistic Calculations

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Chinese physics Letters 2010年第7期27卷 98-100页

作者：刘昆宁传刚邓景康 department of physics and Key Laboratory of atomic and molecular nanosciences of MOE Tsinghua University Beijing 100084

With our newly developed method, we calculate the spin-orbit splitting states 5e1/2 and 5e3/2 of the CF3I molecule incorporating the relativistic effects. Our theoretical results agree excellently with the recent experimental observations. The present study shows that relativistic effects can evidently change the electron momentum distributions of molecular orbitals when a medium Z element is included, such as iodine.

关键词： MOMENTUM (Mechanics) molecular orbitals RELATIVITY (physics) MOLECULES IODINE OBSERVATION (Scientific method)

Experimental and Theoretical Investigation of Valence Orbitals in 1,4-Dioxane by Electron momentum Spectroscopy

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Chinese physics Letters 2006年第5期23卷 1157-1160页

作者：杨铁成宁传刚苏国林邓景康张书锋任雪光黄艳茹 department of physics and Key Laboratory of atomic and molecular nanosciences of MOE Tsinghua University Beijing 100084

The binding energy spectrum of all valence orbitals and the momentum distributions of highest occupied molecular orbital （HOMO： 8ag）, 7bu＋7ag, 4bu, 2bg ＋4ag and 2au in 1, 4-dioxane are investigated by electron momentum spectroscopy （EMS） with 600 eV impact energy. The experimental results are consistent with theoretical calcula- tions of C2h chair conformation using the Hartree-Fock method and density functional theory with 6-311＋＋G^＊＊ and AUG-CC-PVTZ basis sets.

关键词： E 2E SPECTROSCOPY X-RAY SCATTERING MOLECULES

Refit Silver Nanostructures Using a Convergent Electron Beam

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Chinese physics Letters 2007年第4期24卷 1007-1009页

作者：张建红 Key Laboratory of atomic and molecular nanosciences (Ministry of Education) Department of Physics Tsinghua University Beijing 100084

Using a superionic conductor AgI thin film and a direct current electric field, we synthesize silver nanowires in diameter of about lOOnm. In order to refit the prepared nanowires, the samples are irradiated by a convergent electron beam （200 k V） inside a transmission electron microscope to prepare new small silver nanostructures. The new nanostructures are investigated in situ by high-resolution transmission electron microscope. This electron- induced crystal growth method is useful for technical applications in fabrication of nanodevices.

关键词： SHAPE-CONTROLLED SYNTHESIS METAL NANOWIRES COPPER NANOWIRES THIN-FILM GROWTH FIELD SOFT

A Scenario to Provide atomic Data for Fusion Research in the Stage of Precision physics

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Plasma Science and Technology 2010年第3期12卷 335-340页

作者：李家明高翔程诚张小乐青波 department of physics Shanghai Jiao Tong University department of physics and Key Laboratory of atomic and molecular Nanoseiences of Chinese Education Ministry Tsinghua University department of physics and Key Laboratory of atomic and molecular nanosciences of Chinese Education Ministry Tsinghua University

In order to provide abundant atomic data for fusion research in the stage of precision physics, a scenario, being a combination of indispensable theoretical calculations and bench-mark experimental measurements, is proposed. Such abundant atomic data are compiled mainly by theoretical calculations. Accuracies of such abundant data （i.e., atomic energy levels and cor- responding cross sections） are ascertained only by a finite number of bench-mark experimental measurements based on analytical calculation of scattering matrices.

关键词： R-matrix type methods electron-ion collision full-relativistic calculations

Faithful quantum secure direct communication protocol against collective noise

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Chinese physics B 2010年第11期19卷 78-83页

作者：杨静王川张茹 School of Science Beijing University of Posts and Telecommunications Key Laboratory for atomic and molecular nanosciences and department of physics Tsinghua University

An improved quantum secure direct communication （QSDC） protocol is proposed in this paper. Blocks of entangled photon pairs are transmitted in two steps in which secret messages are transmitted directly. The single logical qubits and unitary operations under decoherence free subspaces are presented and the generalized Bell states are constructed which are immune to the collective noise. Two steps of qubit transmission are used in this protocol to guarantee the security of communication. The security of the protocol against various attacks are discussed.

关键词： quantum secure direct communication collective noise

Relativistic calculations of 3s^2 ~1S_0-3s3p ~1P_1 and 3s^2 ~1S_0-3s3p ~3P_(1,2) transition probabilities in the Mg isoelectronic sequence

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Chinese physics B 2011年第3期20卷 150-156页

作者：程诚高翔青波张小乐李家明 Shanghai Institute of Applied physics Chinese Academy of Sciences Key Laboratory for Laser Plasmas(Ministry of Education) and department of physics Shanghai Jiao Tong University department of physics and center for atomic and molecular nanosciences Tsinghua University

Using the multi-configuration Dirac-Fock self-consistent field method and the relativistic configuration-interaction method, calculations of transition energies, oscillator strengths and rates are performed for the 3s2 1S0-3s3p 1P1 spinallowed transition, 3s2 1S0-3s3p 3P1,2 intercombination and magnetic quadrupole transition in the Mg isoelectronic sequence （Mg I, A1 II, Si III, P IV and S V）. Electron correlations are treated adequately, including intravalence electron correlations. The influence of the Breit interaction on oscillator strengths and transition energies are investigated. Quantum eleetrodynamics corrections are added as corrections. The calculation results are found to be in good agreement with the experimental data and other theoretical calculations.

关键词： transition energies oscillator strengths relativistic calculation Breit interactions