原子

And,the rarefication property of cold atoms make the interaction between atoms is very week.Each atom can be treated as a stationary isolated system.

同时，冷原子的稀薄性使得原子间的相互作用力非常小，可以认为每个原子都是一个静止的孤立体系。

In this research , a mathematic model is built for coverting internal coordinates into rectangular coordinates and calculating nucleus distances, bond angles and bihedral angles in a molecule.

本研究课题建立了将分子中原子的自然坐标变换成直角坐标，计算任意两个原子的间距，求解任意三个原子核连线的夹角和任意四个原子构成的二面角的数学模型。

Our proposal is based on atom-cavity field resonant interaction, the atom interacts resonantly with the mode of the cavity according to the Jaynes-Cummings Hamiltonian.

本文提出一个基于原子和腔场共振相互作用传送未知原子直积态的腔QED方案，原子和腔场通过J-C哈密顿量发生共振相互作用。

This peak arises from the preferential rotation of the axes of carbon pairs existed in the specimen under the influence of an alternating load.

在外加应力的作用下，这类碳原子对轴的择尤旋转便引起了内耗。根据这个机构并结合内耗测量过程中试样内部碳原子重新分布的情况，可以推导出碳浓度和内耗峰高度之间的定量关系，并从而求出合金的点阵空位形成能和构成碳原子对时所放出的能量。

In this thesis, a realization of laser cooling and trapping of rubidium atoms is reported. Firstly, the history and development of laser cooling and trapping of neutral atoms and molecules is reviewed. Present study status and future development is prospected.

本学位论文围绕Rb原子的激光冷却与囚禁，报道了以下几个方面的工作：综述了激光冷却与囚禁原子、分子的研究历史及发展过程，介绍了国内外的研究现状和最新成果，展望了原子的激光冷却与囚禁技术的应用前景。

In this thesis, some realization of laser cooling and trapping of rubidium atoms is introduced.The technique path of laser cooling and trapping 87Rb is explained.

本学位论文围绕87Rb原子的激光冷却与俘获，先对冷却与俘获中性原子的各种方案作了介绍，然后描述了我们实验中获得87Rb冷原子的技术途径。

The one is how the long-range order of atoms can be restored when atomic diffusion takes place, and the other is how the theoretical expressions in their present form, more than one self-diffusion coefficient parameter, can be applied to experimental results directly.

一是如何正确理解原子的热扩散运动与合金中原子有序排列之间的矛盾；二是能否将扩散系数以外的其它理论参量与原子跳跃迁移的相关实验测量联系起来。

However, for the system of a single atom inside a driven cavity, semiclassical theory is invalid.

但对于腔内单原子这种特殊介质而言，光与物质的相互作用被推到两个极限上来：其一是物质被减少到只有单个原子与光场相互作用；其二是单个光子便可以饱和原子。

The entanglement of two three-level atoms and in two separated sets of cavities is also calculated.

研究表明三能级原子的初态和原子与腔场的失谐对纠缠的演化有着重要的影响，而且腔场和原子之间的纠缠有突然死亡现象。

The realization of Bose-Einstein condensation in alkali atoms opens up a way to study magnetism in spinor bosons, because these constituent atoms usually have a hyperfine spin degree of freedom.

碱金属原子气体玻色-爱因斯坦凝聚的实现，在开辟了冷原子物理研究领域的同时，也打开了研究玻色系统磁性的大门。这是因为碱金属原子通常具有超精细结构，是旋量玻色气体，能够展示磁性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。