跃迁

At Er~(3+) doping concentration range 0.1-1.5 mol%, Er~(3+) first arrived at ~4F_(7/2) energy level by excited state absorption, then rapidly relaxed to ~2H_(11/2) and ~4S_(3/2) energy levels, the population of which increased, the remarkable upconversion green emission was obtained when Er~(3+) directly went back to ground state by radiative transition.

Er~(3+)浓度在0.1-1.5 mol％时，Er~(3+)通过激发态吸收跃迁到~4F_(7／2)能级，后迅速无辐射弛豫到~2H_(11／2)、~4S_(3／2)能级，~2H_(11／2)和~4S_(3／2)能级上Er~(3+)的布居数增多，Er~(3+)直接辐射跃迁回基态，上转换发射以绿光为主。

Finally we discussed infrared absorption by superlatticecomposed of simple metals by calculating frequency dependentconductivity to which both interband and intraband transitioncontribute.

最后通过分别计算带间跃迁和带内跃迁对电导率的贡献我们讨论了简单金属超晶格的红外吸收。

By analyzing the characteristic of transition and corresponding stimulated-emission cross section in Nd:YAG crystal, according to the coupling condition of energy transition and material-determined wavelength, reasonable coupling parameters of laser rod and cavity mirrors were designed.

通过分析Nd：YAG的跃迁谱线和相应的受激发射截面的特点，根据多跃迁谱线激光材料波长选择的耦合率条件，合理设计激光棒和腔镜的耦合率参数。

When the detuning between the atomic transition frequency and the frequency of each mode is much large, the probability of atomic transition can be neglected.

当原子上、下能级的跃迁频率与腔场的每个模的频率都失谐较大时，原子的跃迁几率可以忽略。

Edit this paragraph the reasons for the color reaction of flame When the alkali metal and its salts in the ignition flame, the atoms absorb the energy of the electron from the orbit of low-energy transition to a higher energy orbit, but at a higher energy orbit is unstable electronic, it is fast transition back to a lower energy orbit, then the energy will be redundant form to emit light.

编辑本段焰色反应的原因当碱金属及其盐在火焰上灼烧时，原子中的电子吸收了能量，从能量较低的轨道跃迁到能量较高的轨道，但处于能量较高轨道上的电子是不稳定的，很快跃迁回能量较低的轨道，这时就将多余的能量以光的形式放出。

Considering both the intrastrand and interstrand nearest-neighbor hoppings of sites, electronic transmission coefficient of DNA is calculated, which depends on energy and interstrand hopping integral.

考虑基元间最近邻的链内和链间跃迁，我们计算了DNA的电荷迁移率随能量和链间跃迁积分的变化。

The FTIR spectrum of DTC-TETA showed strong absorption peaks at 1 461-1 388 cm-1 and 1 174-996 cm-1 which were attributed to partly double bonds of C and C,respectively.The UV spectrum of DTC-TETA had two absorption peaks at 265 and 290 nm,assigned to π—π* transition of N…C…S radical and nonbonding electron n—π* transition of S…C…S radical to conjugated system,respectively.

在DTC-TETA的红外光谱图中，在1461-1388cm-1处和1174-996cm-1处分别出现含有部分双键性质的〖JGC〖ZJXS，YN键和键的特征吸收峰；在紫外光谱图中，分别在265和290 nm处出现两个最大吸收峰，分别对应于N…C…S基团的π—π*跃迁和S…C…S基团中硫原子上非键电子向共轭体系的n—π*跃迁；元素分析结果表明该化合物中碳、氢、氮、硫的摩尔比近似为

The oscillator strengths of the 1s-2p transitions have been calculated using configuration interaction method for different LS dipole allowed transition series.

对不同内壳层跃迁系列的振子强度进行了研究，分析了不同系列随跃迁末态的主量子数的变化规律。

This is because that the solvent polarity affects ICT process in two ways: on the one hand, the ICT state is better solvated in more polar solvent, which favors the ICT process; whereas on the other hand, the rates of non-radiative decay and intersystem crossing of the ICT state are increased, which unfavors the ICT process.

这是因为溶剂极性增大，一方面ICT态被更好地溶剂化，ICT过程活化能降低，有利于ICT过程的发生；另一方面ICT态非辐射跃迁和系间窜跃速率增大，导致ICT荧光猝灭。

The diode laser at 657 nm has the characteristics of lower cost and higher power than that at 633 nm. Therefore, we use the 657 nm ECDL to investigate the saturation spectrum of the hyperfine structure components of P(84) 5-5 transition of 127I2 at 657.483 nm for frequency stabilization of our ECDL laser.

nm 波段的二极体雷射比起633 nm 波段的二极体雷射拥有较低的费用和较高的功率，因此，我们使用657 nm 波段的外腔二极体雷射来研究657.483 nm 波段之碘分子跃迁P(84 5-5 transition of 127I2，并将我们的外腔二极体雷射稳频在此跃迁的超精细结构成分上。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。