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1.
分子内部转动传能的静态池实验观察到了碰撞量子干涉效应(CQI),并且测得积分干涉角,为了获得更加精确的分子内部转动传能的碰撞量子干涉效应信息,实验就必须要采用分子束实验进行.本文理论上采用各项异性相互作用势,应用含时微扰理论的一级波恩近似,假想在分子束实验的条件下,建立在原子—双原子分子体系中碰撞量子干涉的理论模型.理论上推导出微分干涉角具体表达式,通过计算定性地讨论了微分干涉角随着碰撞参数、速率等的变化趋势,同时初步探讨了实验的正确观测途径,得出了采用分子束进行实验观测的实验方法,为进一步进行分子束实验提供了理论基础,对实验的进行起到了一定的借鉴作用.  相似文献
2.
Theoretical analyses and experimental studies on semiconductor disk lasers   总被引:2,自引:0,他引:2  
The comprehensive theoretical analyses and experimental studies on semiconductor disk lasers are presented. The edge-emitting photoluminescence spectrum which reflects the essential emission properties of quantum wells is theoretically modeled, and the result is in good agreement with the experiment. The surface-emitting photoluminescence spectrum which carries the characteristics of the semiconductor microcavity is explained using the numerically simulated longitudinal confinement factor. The output characteristic is modeled by taking into account the thermal effect, and the result is consistent with the experiment. The oscillating mode of the laser is codetermined by the reflectivity of DBR, the edge-emitting, and the surface-emitting PL spectrum.  相似文献
3.
In our previous theoretical studies [Meng-Tao Sun, Yong-Qing Lee, and Feng-Cai Ma, Chem. Phys.Left. 371 (2003) 342], we have reported the quantum interference on collision-induced rotational energy transfer on CO (A ^1 Π,v = 3) with inert gases, which originates from the difference between the two A-related collision potential energy surfaces. The interference angle, which measures the degree of coherence, is presented in this paper. Based on the time-dependent first order Born approximation, taking into account the anisotropic Lennard-Jones interaction potentials, the relation of the interference angle with the factors, including experimental temperature, partner, and rotational quantum number, are obtained. The changing tendencies with them are discussed. This theoretical model is important to understanding and performing this kind of experiment.  相似文献
4.
1995年沙等在静态池实验中观测到了碰撞诱导转动传能中的量子干涉效应,并且测量到了决定跃迁截面幅值的积分干涉角(J.Chem.Phys.,1995,102,2772).同时,孙等在理论上计算了CO A1Ⅱ(v=0)~e3∑-(v=1)与He,Ne以及其它碰撞伴的碰撞体系的积分干涉角,建立了相应的理论模型.然而,以前的研究都局限在碰撞伴通常被认为是没有结构的粒子,但是在碰撞过程中相互碰撞的两个粒都有内部角动量,自旋-轨道相互作用又对反应速率起着非常重要的影响,同时也能够影响反应势垒的高度,因此这种近似忽略了碰撞伴原子对整个碰撞体系得影响.基于这种考虑,在这篇文章中我们从理论上研究AB (1∑,J)+C(slj)→AB(1∑,J')+C(slj')的碰撞诱导的电子态和转动态的能量传递,应用一级含时波恩近似、各向异性L-J相互作用势和直线轨迹近似,建立了理论模型.并讨论和比较了在近共振电子态和非共振电子态两种情况下的振动传能的跃迁几率.  相似文献
5.
晶界对庞磁电阻颗粒薄膜的磁学和输运性能的影响   总被引:1,自引:0,他引:1       下载免费PDF全文
采用脉冲电子束沉积技术,在Si(100)单晶衬底上沉积庞磁电阻La0.67Ca0.33MnO3颗粒薄膜,并对它的磁学性能和电学输运性能进行了表征.研究晶界对庞磁电阻薄膜的物理性能的影响,结果表明,晶界的存在使得晶粒之间的耦合变弱,在变温磁化过程中表现出团簇玻璃态行为,金属—绝缘体转变温度(Tp)远远低于铁磁—顺磁转变温度(Tc).低温下电子输运具有弱局域化行为.在低磁场下,晶界的存在掩盖了La0.67Ca0.33MnO3的本征磁电阻行为.  相似文献
6.
电子散斑干涉载频调制形貌测量方法的分析   总被引:1,自引:0,他引:1       下载免费PDF全文
根据电子散斑干涉载频调制测量物体形貌的基本原理,物体表面的微小偏转可引入包含物体高度信息的载波干涉条纹。将物体的偏转视为变形,对物体变形与载波干涉条纹之间的关系进行了讨论,得出了离面位移引入载波和面内位移引入含有物体高度信息相位的结论。发现利用典型电子散斑干涉系统测量物体形貌效果最好,并通过实验得到了验证。  相似文献
7.
An intracavity frequency-doubled vertical external cavity surface emitting laser (VECSEL) with green light is demonstrated. The fundamental frequency laser cavity consists of a distributed Bragg reflector (DBR) of the gain chip and an external mirror. A 12-mW frequency-doubled output has been reached at 540 nm with a nonlinear crystal LBO when the fundamental frequency output is 44 mW at 1080 nm. The frequency doubling efficiency is about 30%.  相似文献
8.
Collisional quantum interference (CQI) on rotational energy transfer was observed in Na2(A^1∑u^+,ν=8~b^3∏0u,ν=14) system in collision with Na [Chem. Phys. Lett. 318 (2000) 107], and the degree of the interference was measured. The integral interference angle was obtaJned through theoretical calculation. We will research the factors that have effect on collisional quantum interference on rotational energy transfer in Na2(A^1∑u^+,ν=8~b^3∏0u,ν=14)-Na system. Basing on the time-dependent first order Born approximation, and taking into account the anlsotroplc Lennard Jones interaction potentials and "straight-line" trajectory approximation, we obtain the factors that have effect on CQI in Na2-Na system, and obtain the relation between the integral interference angle and rotational quantum number.  相似文献
9.
In this paper we report a new method to fabricate nanostructured films, La0.67Ca0.33MnO3 (LCMO) nanostructured films have been fabricated by using pulsed electron beam deposition (PED) on anodized aluminium oxide (AAO) membranes, The magnetic and electronic transport properties are investigated by using the Quantum Design physics properties measurement system (PPMS) and magnetic properties measurement system (MPMS). The resistance peak temperature (Tp) is about 85 K and the Curie temperature (To) is about 250 K for the LCMO film on an AAO membrane with a pore diameter of 20nm. Large magnetoresistance ratio (MR) is observed near Tp. The MR is as high as 85% under 1 T magnetic field. The great enhancement of MR at low magnetic fields could be attributed to the lattice distortion and the grain boundary that are induced by the nanopores on the AAO membrane.  相似文献
10.
In our previous theoretical studies [Meng-Tao Sun, Yong-Qing Lee, and Feng-Cai Ma, Chem. Phys.Lett. 371 (2003) 342], we have reported the quantum interference on collision-induced rotational energy transfer on CO (A1П, v = 3) with inert gases, which originates from the difference between the two A-related collision potential energy surfaces. The interference angle, which measures the degree of coherence, is presented in this paper. Based on the time-dependent first order Born approximation, taking into account the anisotropic Lennard-Jones interaction potentials, the relation of the interference angle with the factors, including experimental temperature, partner, and rotational quantum number, are obtained. The changing tendencies with them are discussed. This theoretical model is important to understanding and performing this kind of experiment.  相似文献
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