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自发产生相干对探测场的色散和吸收影响   总被引:1,自引:0,他引:1       下载免费PDF全文
在Y形四能级原子系统中,分析了自发产生相干对探测场的色散和吸收影响. 结果发现,随着自发产生相干的增强,系统呈现的电磁感应透明窗口逐渐变窄,并在共振处出现反常色散,吸收从负值变为正值. 同时,当抽运场和耦合场的相对强度不同时,共振处附近吸收为零或出现增益,而两场强相等或接近时,系统对探测场表现为吸收.  相似文献
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A new kind of continuous-wave (CW) cold molecular beam, methyl cyanide (CH3CN) beam, is generated by a bent electrostatic quadrupole guiding. The Stark shift of rotational energy levels of CH3CN molecule and its population distribution are calculated, and the dynamic processes of electrostatic guiding and energy filtering of CH3CN molecules from a gas source with room temperature (300 K) are simulated by Monte Carlo Method. The study showed that the longitudinal and transversal temperatures of output cold CH3CN beam could be about ∼2 K and ∼ 420 mK, and the corresponding guiding efficiency was about 10−5 as the guiding voltage was 3 kV. Furthermore, the temperature of the guided molecules and its guiding efficiency can be controlled by adjusting the guiding voltages applied on electrodes.   相似文献
3.
A new kind of continuous-wave (CW) cold molecular beam, methyl cyanide (CH3CN) beam, is generated by a bent electrostatic quadrupole guiding. The Stark shift of rotational energy levels of CH3CN molecule and its population distribution are calculated, and the dynamic processes of electrostatic guiding and energy filtering of CH3CN molecules from a gas source with room temperature (300 K) are simulated by Monte Carlo Method. The study showed that the longitudinal and transversal temperatures of output cold CH3CN beam could be about ~2 K and ~ 420 mK, and the corresponding guiding efficiency was about 10?5 as the guiding voltage was 3 kV. Furthermore, the temperature of the guided molecules and its guiding efficiency can be controlled by adjusting the guiding voltages applied on electrodes.  相似文献
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A versatile electrostatic trap with open optical access for cold polar molecules in weak-field-seeking state is proposed in this paper. The trap is composed of a pair of disk electrodes and a hexapole. With the help of a finite element software, the spatial distribution of the electrostatic field is calculated. The results indicate that a three-dimensional closed electrostatic trap is formed. Taking ND3 molecules as an example, the dynamic process of loading and trapping is simulated. The results show that when the velocity of the molecular beam is 10 m/s and the loading time is 0.9964 ms, the maximum loading efficiency reaches 94.25% and the temperature of the trapped molecules reaches about 30.3 mK. A single well can be split into two wells, which is of significant importance to the precision measurement and interference of matter waves. This scheme, in addition, can be further miniaturized to construct one-dimensional, two-dimensional, and three-dimensional spatial electrostatic lattices.  相似文献
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利用激光消融/激光诱导荧光的方法测量了MgH分子A2Π~X2Σ+的色散荧光谱, 并通过分析实验光谱获得了MgH分子的A2Π(v′=0)~X2Σ+(v〞=0,1)跃迁的弗朗克-康登因子和相应的跃迁频率. 同时也用理论计算方法计算出MgH分子A2Π(v′=0)~X2Σ+(v〞=0,1)的弗朗克-康登因子和跃迁频率. 实验结果、理论结果和其他文献中的理论结果是一致的.  相似文献
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