搜索结果: 1-15 共查到“知识库 原子光谱学”相关记录69条 . 查询时间(0.764 秒)
Rydberg原子nS1/2→(n+1)S1/2双光子激发EIT-AT光谱
Rydberg原子 微波场 EIT-AT 双光子光谱
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2022/3/24
主要研究了热原子蒸气池中铯Rydberg原子nS1/2→(n+1)S1/2微波耦合的双光子光谱.铯原子基态(6S1/2)、第一激发态(6P3/2)、Rydberg态(69S1/2)形成阶梯型三能级系统,弱探测光作用于基态到激发态6S1/2→6P3/2的跃迁,强耦合光则作用于6P3/2→69S1/2的Rydberg跃迁形成电磁感应透明(EIT)效应,实现对Rydberg原子的光学探测.频率fMW=1...
纳米α-Fe2O3的制备及其正电子湮没谱学研究
氧化铁 X射线衍射谱 正电子湮没寿命谱
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2018/9/30
对氧化铁颗粒进行了X射线衍射谱(XRD)测量和正电子湮没寿命谱(PALS)测量,分别运用Jade和Lifetime软件拟合数据,研究了纳米氧化铁颗粒的结构、缺陷以及自由电子密度.XRD测量结果表明了氧化铁是简单六方晶系,空间群是R-3c(167),其相应的点阵常数分别是三个基矢的长度a=b=0.530 42 nm,c=1.374 60 nm.PALS测量结果表明了正电子在氧化铁材料中的寿命成分有三...
SPECTRAL REFLECTANCE OF ALFALFA GROWN UNDER DIFFERENT WATER TABLE DEPTHS
Multispectral Detection Agriculture Monitoring Reflectance
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2015/7/30
Plant water stress can limit productivity and has an effect on plant physiology and canopy architecture. Changes in water status of a
canopy can have indirect effects on remotely sensed optical refl...
矢量维数分割量化的超光谱图像压缩方法
图像压缩 矢量量化 维数分割 超光谱图像
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2013/11/20
提出了一种矢量维数分割量化的超光谱图像压缩算法，通过维数分割将矢量分为几个部分，然后利用哈达玛变换的性质，在哈达玛域内单独设计每个部分的码书。设计过程中采用最优矢量量化器设计原则，并结合分步判断排除不等式算法与LBG（Linde Bazo Gray）聚类算法快速生成矢量量化过程的最终码书，使各个部分的码书性能达到最优，改善整体码书的性能。实验表明，这种算法在码书尺寸相同的情况下，图像的恢复质量以及...
A Resolved-Super-Transition-Arrays method for calculation of the spectral absorption coefficient in hot plasmas
Resolved-Super-Transition-Arrays method calculation of the spectral absorption coefficient hot plasmas Atomic Physics
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2012/4/24
A new method, 'Resolved-Super-Transition-Arrays', for calculation of the spectral absorption coefficient in hot plasmas is presented. The formulae of the traditional Super-Transition-Arrays method [A....
Diagrammatic pump-probe approach to coherent backscattering of laser light by cold atoms: Double scattering revisited
Diagrammatic pump-probe coherent backscattering of laser light cold atoms Double scattering revisited Atomic Physics
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2012/4/20
We present a diagrammatic derivation of the coherent backscattering spectrum from two two-level atoms using the pump-probe approach, wherein the multiple scattering signal is deduced from single-atom ...
Measurement of the W boson helicity in top quark decays using 5.4 fb^-1 of ppbar collision data
W boson helicity top quark decays 5.4 fb^-1 of ppbar collision data
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2011/1/5
We present a measurement of the helicity of the W boson produced in top quark decays using
t¯t decays in the ℓ+jets and dilepton final states selected from a sample of 5.4 fb−1 of co...
Molecule States in a Gate Tunable Graphene Double Quantum Dot
Molecule States Gate Tunable Graphene Double Quantum Dot
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2010/11/25
We have measured a graphene double quantum dot device with multiple electrostatic gates that
are used to enhance control to investigate it. At low temperatures the transport measurements
reveal hone...
Electric-field Manipulation of the Lande' g Tensor of Holes in In0.5Ga0.5As/GaAs Self-assembled Quantum Dots
Electric-field Manipulation Self-assembled Quantum Dots
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2010/11/25
The effect of an electric field on spin precession in In0.5Ga0.5As/GaAs self-assembled quantum
dots is calculated using multiband real-space envelope-function theory. The dependence of the Land´...
Shape control of QDs studied by cross-sectional scanning tunneling microscopy
Shape control of QDs cross-sectional scanning tunneling microscopy
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2010/11/23
We report on the magnetic and phononic excitation spectrum of Sr3Cr2O8 determined by THz and
infrared (IR) spectroscopy, specific heat, and electron spin resonance measurements. We identify the singl...
The $P$-wave $[cs][\bar{c}\bar{s}]$ tetraquark state: $Y(4260)$ or $Y(4660)$?
$P$-wave $[cs][\bar{c}\bar{s}]$ tetraquark state $Y(4260)$ or $Y(4660)$
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2011/1/5
Mass of the P-wave cs-scalar-diquark ¯c¯s-scalar-antidiquark state is computed in the framework of QCD sum rule. The result 4.64 ± 0.25 GeV is in good agreement with the experimental value o...
Tetraquark-based analysis and predictions of the cross sections and distributions for the processes e^+ e^- --> Upsilon(1S) (pi^+ pi^-, K^+ K^-, eta pi^0) near Upsilon(5S)
processes e^+ e^- --> Upsilon(1S) (pi^+ pi^-, K^+ K^-, eta pi^0) Upsilon(5S)
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2011/1/5
We calculate the cross sections and final state distributions for the processes e+e−
!(1S)(+−,K+K−, 0) near the (5S) resonance based on the tetraquark hypothesis. This
framew...
Dilaton stabilization by massive fermion matter
stabilization massive fermion matter
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2010/12/21
The implications for the Dilaton stabilization problem are investigated when the effective potential for this field is generated by the existence of a massive fermion. The previously evaluated two loo...
Non-perturbative predictions for cold atom Bose gases with tunable interactions
Non-perturbative predictions cold atom Bose gases tunable interactions
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2011/1/7
We derive a theoretical description for dilute Bose gases as a loop expansion in terms of composite- eld propagators by rewriting the Lagrangian in terms of auxiliary elds related to the normal and a...
Group-III assisted catalyst-free growth of InGaAs nanowires and the formation of quantum dots
Group-III assisted catalyst-free growth InGaAs nanowires quantum dots
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2010/11/25
Growth of GaAs and InxGa1xAs nanowires by the group-III assisted Molecular Beam Epitaxy growth method is studied in dependence of growth temperature, with the objective of maximizing the ind...