所以，在1967年，SI采用了一个更为精确的制定办法，该办法基于一个铯原子在两个能级之间跃迁时的辐射频率。
Thus, in 1967, SI adopted a more precise definition based on the frequency of the radiation a caesium atom emits when it flips between two energy states.
一团放射性铯137，整体以恒定的速率衰变，但是其内部单个原子的衰变是一种不可预测的随机模式。
A lump of radioactive cesium-137, for example, may decay at a steady rate overall, but individual atoms within the lump will decay in an unpredictable, random pattern.
在形式上，一秒钟，或者说一次“滴答声”被定义为在小心受控条件下，微波能量喷发或是铯133原子吸收的9 192 631 770个循环。
One second is formally defined as 9, 192, 631, 770 cycles, or "ticks and tocks," of microwave energy emitted or absorbed by cesium-133 atoms under carefully controlled conditions.
比如说，秒就是根据铯原子内部的电子跃迁时间来下的定义，而米的定义则和光速有关。
A second of time, for instance, is now defined in terms of an electron transition of the cesium atom. And the meter is tied to the speed of light.
日本原子能安全和保安院说，爆炸后在核电站探测到的放射性铯，极有可能是来自于融毁的燃料棒。
Japan's nuclear agency said there was a strong possibility that radioactive cesium detected at the plant after the blast was from the melting of a fuel rod.
这一获得诺贝尔奖的发现产生了铯原子钟和氢微波激射器。
His discoveries, which won him the Nobel prize, led to the caesium atomic clock and the hydrogen maser.
国际原子能机构强调从Iitate村庄获得的样品数据仅是对一个点的解读，铯的浓度在一个区域内会有巨大的改变。
The atomic energy agency has stressed that the data from Iitate are just a spot reading and that concentrations of cesium in the region vary widely.
这也是我们应用原子钟或微波钟的原因，它们通过测量铯原子的摆动来计时，就像一个钟摆在轻微摆动。
That's why we use atomic - or microwave - clocks, which measure the vibration of a caesium atom to keep time, just like the tiny swinging of a pendulum.
这就是众所周知的铯原子钟的基础，它是目前的频率和时间基准。
This is the basis for the well - known cesium clock, presently the standard of frequency and time.
一个铯钟的工作原理是：将铯原子暴露于微波中，直到它们以一个频率共振，然后以一个相应的周期作为时间度量。
A cesium clock operates by exposing cesium atoms to microwaves until they vibrate at one of their resonant frequencies and then counting the corresponding cycles as a measure of time.
美国国家标准技术研究所的研究人员正在开发一种镱原子钟，这种原子钟可能比铯原子钟更好。目前的时间标准是由铯原子钟确定的。
National Institute of Standards and Technology researchers are developing atomic clocks based on the element ytterbium that could outclass cesium atomic clocks, which currently set the standard.
结果表明斜光抽运方案可以有效降低铯原子束频标中的光频移。
The results show, the light frequency shift can be effectively reduced in the sharp Angle laser light pumping scheme.
镱原子钟甚至可能比铯原子钟更加精确和稳定。
And an ytterbium the potential to be even more accurate and stable than the cesium chronometer.
铯133原子发射一个细的微波谱线当它的第55个电子从受激态轨道跳回基态时(跃迁)。
Cesium-133 atoms emit a thin microwave spectral line when its 55th electron jumps back from an excited state orbital to its ground state (transition).
基于已建立的小型铯原子钟计算机模型系统，研究了铯束原子速度为双峰分布和三峰分布对原子钟微波频谱的影响。
Based on a numerical model cesium atomic clock designed before, the influence of atomic velocity distribution consisting of two peaks and three peaks has been studied respectively.
介绍了实现铯原子喷泉的过程及条件，并详细讨论了光路中各种光学元件对铯原子喷泉光学系统性能的影响。
The process and conditions of cesium atomic fountain were introduced with detailed discussion of the influence of the optical component on fountain optical system.
结果实验表明铯原子钟慢了很小的一个时间单位。
Experimental results show that the slow cesium atomic clock time a very small unit.
利用我们现有的标准，一台试验型实验室铯束标准，三台氢原子钟以及若干台(2 -6)铷气泡标准来建立原子时尺度。
Based on available frequency standards: one prototype laboratory model of cesium clock, three hydrogen clocks and several (2-6) rubidium clocks, the SO atomic time scale has been established.
此项频移误差是决定铯原子喷泉频标准确度总体水平的主要因素之一。
This uncertainty is one of the critical factors governing the accuracy level of the cesium fountain frequency standard.
国际上对秒的定义就是根据当一个铯原子的电子改变能级的时候有多少振动发生。
And the international definition of the second is based on exactly how many vibrations happen when a cesium atom's electron changes energy levels.
本文研究了火焰原子吸收法中以硝酸铯作为消电离剂，对降水中测定钾时消除电离干扰的方法。
We use CsNO3 as disionizer in flame atom absorption spectrum analysis to remove ionization interference when potassium in precipitation is determined.
本文提出一种铯原子束激射器的建议，其中利用了双束激光抽运选态技术和原子贮存泡方法。
In this paper a cesium beam maser is proposed in which the optically pumping state selection technique by two laser beams is used together with the atom storage bulb technique.
介绍了一种铯原子饱和吸收光谱的简化装置。
A simplified device for cesium saturation spectroscopy is introduced.
镱原子钟甚至可能比铯原子钟更加精确和稳定。
And an ytterbium clock has the potential to be even more accurate and stable than the cesium chronometer.
早在1964年，为了庆祝公司成立25周年，惠普公司推出了高度精确的HP 5060a铯束原子钟，用来确保时间的准确。
Back in 1964, as HP celebrated its 25th anniversary as a company, HP introduced the highly accurate HP 5060a cesium-beam to keep accurate time.
实验上常常选择铯、铷等能级结构相对简单的碱金属原子来研究光与原子的相互作用。
Cesium, rubidium or other alkali metal atoms with simple energy level structure often are used in experiments to study the interaction between light and atoms.
吉布解释：「在最好的铯原子喷泉钟内，最大的误差来源是所谓的冷碰撞。」
"In the best cesium fountains the largest source of error are so-called cold collisions , " Gibble explained .
以我们对铯原子法拉第反常色散原子滤光器(FADOF)的研究为基础，结合其它FADOF的研究成果，介绍了FADOF的原理、特性、以及在滤波、鉴频、磁光调制等方面的应用。
Based on our and other's study on Faraday anomalous dispersion optical filter (FADOF), the principle, structure, property and various application of FADOF will be discussed in this paper.
铯原子的均匀振动记录时间，故而十分准确。
Atomic clocks rely on regular oscillations of caesium atoms to keep time and are extremely accurate.
铯原子的均匀振动记录时间，故而十分准确。
Atomic clocks rely on regular oscillations of caesium atoms to keep time and are extremely accurate.
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