共查询到19条相似文献,搜索用时 125 毫秒
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利用共线快离子束-激光高分辨光谱学方法测量了^143,145Nd^ 570.38nm谱线的超精细结构光谱,并得到了参与跃迁的上、下能级的超精细相互作用常数。 相似文献
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Measurement of hyperfine structure and isotope shifts in the 580.56nm line of 142-145,146,148,150Nd+ 下载免费PDF全文
Isotope shifts and hyperfine spectrum of singly ionized neodymium ion was measured by collinear fast-ion-beam laser spectroscopy. The hyperfine A constants and B constants are obtained for the (23230)9/2^0 level and 4f^45d ^6K9/2 level, respectively. The optical isotope shifts between seven isotopes in the 580.56 nm of^142-145,146,148,150Nd^ line are determined. The configuration admixtures for (23230)9/2^0 level were quantitatively analysed to be 4f^46p, 4f^35d^2, and 4f^35d6p with mixing coefficients of 67%, 5%, and 28%, respectively. 相似文献
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利用共线快离子束 激光光谱学方法测量了1 4 3 ,1 4 5Nd+6K9/ 2 → (2 32 2 9.991 ) o9/ 2 跃迁的超精细结构光谱 ,得到了上、下能级的超精细相互作用常数 . 相似文献
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马洪良 《原子与分子物理学报》2002,19(2):153-155
原子光谱中,同位素移位和超精细结构光谱是少数几个能够将原子物理和原子核物理这两个不同的物理分支联系起来的课题之一.利用共线快离子束-激光光谱学方法测量了单电荷态钕离子4f45d6G3/2→(26041)°5/2跃迁(波长577.21 nm)的共振光谱,得到了所有7个稳定同位素(A=142~146,148,150)之间的能量移位和2个奇同位素(A=143,145)的超精细结构光谱. 相似文献
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报道了14N16O2v3带(001-000)的5组新的超高分辨激光磁共振谱线的观测,包括实验的背景、装置、方法和结果.由于利用了内腔饱和吸收情况下的兰姆凹陷和最优化的相敏调制探测技术,所得光谱的分辨率达到了微波谱量级.这些谱线是分析14N16O2乃至非对称陀螺自由基分子的塞曼效应和超精细结构特性的重要实验资料. 相似文献
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在可见光范围内 ,用激光蒸发 /反应、超声射流和激光诱导荧光光谱方法 ,对NiI[14 .6 ]2 △5/ 2 -X2 △5/ 2跃迁的 (9,0 )带进行了高分辨研究 .80MHz分辨的光谱显示超精细结构是由于激发态中未成对电子与碘 (I=5 /2 )核大磁矩相互作用引起的 .在v =9能级上低J谱线的超精细线宽快速下降 ,表明在 [14 .6 ]2 △5/ 2 态中超精细耦合适合Hundaβ 耦合情况 .[14 .6 ]2 △5/ 2 态的精确转动参数和超精细参数已得到 ,而且显示v =9能级被微扰了 . 相似文献
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采用孤立实激发技术,对铕原子4f~76p_(3/2)ns(n=7,8)自电离态的光谱进行了系统的研究,同时是首次在不同激光偏振组合下进行的研究。首先,用前两束激光分步将铕原子从基态4f~76s~2经中间4f~76s6p态激发至4f~76sns里德堡态,然后再用第三束激光通过离子实4f~76s~+→4f~76p~+_(3/2)的跃迁将其进一步激发至4f~76p_(3/2)7s自电离态或4f~76p_(3/2)8s自电离态。对铕原子4f~76p_(3/2)ns(n=7,8)自电离态复杂的光谱分别给出了详细的解释,从中我们可以获得一些重要的光谱信息,比如自电峰的能级位置和线宽等,同时还可以观察到收敛于不同离子限的自电离系列之间的组态相互作用。最后,通过比较不同激光偏振组合下的自电离光谱,确定了一些自电离态的总角动量的值。 相似文献
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采用孤立实激发技术(isolated-core excitation, ICE)及速度影像技术(velocity-map imaging,VMI),研究了Eu原子4f~76p_(3/2)6d自电离过程的动力学特性.孤立实激发技术用于将Eu原子从基态4f~76s~(2 8)S_(7/2)经中间态4f~76s6p激发到4f~76s6d里德堡态,然后将其进一步激发至4f~76p_(3/2)6d自电离态;速度影像技术用于探测其自电离过程的动力学特性,从而获得自电离衰变的分支比(branch ratio, BR)和弹射电子的角分布(angular distribution, AD).自电离衰变的分支比代表离子的能量分布,从中获得VMI影像的径向信息;而通过各向异性参数描述的弹射电子的角分布揭示了VMI影像的角向信息.此外,讨论了自电离衰变分支比和弹射电子角分布在整个自电离共振能域内的变化情况.基于4f~76s~+和4f~75d~+两个离子态的分支比,讨论了实现Eu离子粒子数反转的可能性. 相似文献
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依据最弱受约束电子势模型理论,计算了铕原子4f76snd6D9/2(n≥13)、4f76snd8D9/2(n≥17)、4f76snd8D5/2(n≥15)和4f76snd8D3/2(n≥21)里德堡系列能级.计算结果与实验值的最大相对误差为4×10-5,最大绝对误差是1.91cm-1,达到了较高精度,这表明文中的外推数据是可信的. 相似文献
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二价铕离子(Eu2 )在KMgF3晶体中产生窄带线状发射,峰值位于360 nm.依据自身建立的激发态能量损耗模型,预测了4f7(6P7/2)→4f7(8S7/2)跃迁实现受激发射的可能性.采用ASE技术测得了KMgF3:Eu2 晶体360 nm发射的光学增益,得到净光学增益系数g=(11.4±3.2)cm-1,实验证实了理论预测.晶体退火或掺杂敏化离子Gd3 或Ce3 可以改善Eu2 的增益效果. 相似文献
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在空气中900℃温度下,将纯天然无水芒硝( Na2 SO4)和DyF3的混合粉末加热25 min,制备了Na2SO4:Dy3+新型发光材料.通过同步辐射研究了NaSO4:Dy3+的发光性质.并测量了在室温中真空紫外-紫外光下的发射和激发光谱.根据发射光谱得到了不同Dy3+掺杂浓度和不同激发下发光的黄蓝比(Y/B)是不同的.通过监测黄色发光得到的激发光谱,分别由Dy3+,4f9→4f85d跃迁(172 nm)、O2--Tm3+之间的电荷转移带(165 nm)引起的强激发谱和基质吸收(138,245 nm)、对应Dy3+,6 H15/2→4 D7/2,6H15/2→6 P3/2,6 H15/2→6P7/2跃迁(299,325,351nm)引起的弱激发谱组成. 相似文献
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M. Kirm H. Lichtenberg V. N. Makhov E. Negodin T. V. Ouvarova E. Suljoti 《辐射效应与固体损伤》2013,168(6-12):911-914
Using energy- and time-resolved spectroscopy the luminescence properties of Er 3+ doped BaY 2 F 8 crystals were investigated at 10 v K under VUV synchrotron radiation excitation. Radiative intraconfigurational f - f and interconfigurational d - f transitions in Er 3+ ions were observed under f - d excitation. Whereas the onset of 4 S 3/2 population via f - d excitation starts at 59 900 v cm m 1 , efficient excitation of emissions arising from the 2 P 3/2 state begins only above 67 000 v cm m 1 in VUV region. Such behaviour can be explained by a cross-relaxation process of the type ( 2 F(2) 5/2 , 4 I 15/2 ) M ( 2 P 3/2 , 2 P 3/2 ) taking place within f -states of Er 3+ ions finally populating the emitting 2 P 3/2 state. 相似文献
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The upconverted VUV (185 nm) and UV (230 and 260 nm) luminescence due to 5d-4f radiative transitions in Nd3+ ions doped into a LiYF4 crystal has been obtained under excitation by 351/353 nm radiation from a XeF excimer laser. The maximum upconversion efficiency, defined as the ratio of intensity for 5d-4f luminescence to overall intensity for 5d-4f and 4f-4f luminescence from the 4D3/2 Nd3+ level, has been estimated to be about 70% under optimal focusing conditions for XeF laser radiation. A redistribution of intensity between three main components of 5d-4f Nd3+ luminescence is observed under changing the excitation power density, which favors the most long-wavelength band (260 nm) at higher excitation density level. The effect is interpreted as being due to excited state absorption of radiation emitted. The upconverted VUV and UV luminescence from the high-lying 2F(2)7/2 4f level of Er3+ doped into a LiYF4 crystal has also been obtained under XeF-laser excitation the most intense line being at 280 nm from the spin-allowed transition to the 2H(2)11/2 4f level of Er3+, but the efficiency of upconversion for Er3+ emission is low, less than 5%. 相似文献
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Horoi M Gour JR Włoch M Lodriguito MD Brown BA Piecuch P 《Physical review letters》2007,98(11):112501
We compare coupled-cluster (CC) and configuration-interaction (CI) results for (56)Ni obtained in the pf-shell basis, focusing on practical CC approximations that can be applied to systems with dozens or hundreds of correlated fermions. The weight of the reference state and the strength of correlation effects are controlled by the gap between the f(7/2) orbit and the f(5/2), p(3/2), p(1/2) orbits. Independent of the gap, the CC method with 1p-1h and 2p-2h clusters and a noniterative treatment of 3p-3h clusters is as accurate as the more demanding CI approach truncated at the 4p-4h level. 相似文献