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1.
About 2500 lines of CH3 35Cl have been assigned. The strong xy Coriolis resonance between thev 2 andv 5 modes is quite visible between thev 4+v 4 ±1 perpendicular band, centered around 4383 cm–1, and thev 4 ±1 +v 5 ±1 perpendicular component, centered around 4475 cm–1, with a crossing of upper energy levels allowing the observation of lines which are normally forbidden. Although not yet observed with certainty, because of the great density of lines of the spectrum, thev 4 1 +v 5 ±1 parallel component is nevertheless detectable by its effects onv 2+v 4 ±1 which is linked by Coriolis resonance to both components ofv 4+v 5. Moreover the spectrum is much complicated by many other resonances with weak bands which occur at level crossings: it is the case ofv 2+3v 6 ±1 , connected tov 2+v 4 ±1 by the well known Darling Dennison resonance which couplesv 4 ±1 and 3v 6 ±1 , and also ofv 5 ±1 +3v 6 ±1 connected tov 4 ±1 +v 5 ±1 by the same resonance; but this last case is complicated by an anharmonic resonance betweenv 5 ±1 +3v 6 ±1 and 2v 3+3v 6 1 . Two more perturbations occur on the K=–1 side ofv 2+v 4: a weak Coriolis resonance gives rise to one subband ofv 1+v 2 at a level crossing withv 2+v 4, and thev 1+v 5 band (linked of course tov 1+v 2 by the Coriolis resonance between thev 2 andv 5 modes) is quite visible and perturbs several subbands ofv 2+v 4 of high values of K through an anharmonic resonance. Moreover, the complex (3v 5 ±1 ,v+2v 5 0 , 2v 2+v 5 ±1 , 3v 2,v 2+2v 5 ±2 , 3v 5 ±3 ) system of Coriolis-connected bands is linked to the bands studied in the present work by two Fermi resonances: one betweenv 2+2v 5 0 andv 1+v 2, and the other one betweenv 1+v 5 and 3v 5 ±1 , whose several subbands have been observed on the low part of the spectrum. The values of all the band centres and of the different coupling constants have been estimated, but all these interactions make the line assignments and the interpretation of the spectrum very difficult.  相似文献   

2.
利用有序算符乘积内的积分技术(IWOP),建立了一种称之为相干纠缠态的两粒子体系的新表象,研究了这种新表象的性质,从理论上探讨了这种相干纠缠态的产生方法.结果表明:本文建立的这种p1-p2a1+a2的共同本征态|p,β〉,既具有相干态的特性,又体现了纠缠态的特征,具有超完备性,完全可以作为一个表象使用. 物理上可以用光分束器来实现|< 关键词: IWOP技术 相干纠缠态表象 分束器  相似文献   

3.
在多通道量子亏损理论框架下,利用相对论多通道理论,分别在冻结实近似和考虑偶极极化下计算钪原子的Jπ=(3/2)-,(5/2)-的三个收敛于 3d4s(1D2)的自电离里德伯系列的能级.对3d4s(1D2)np2D3/2和3d4s(1 关键词: 相对论多通道理论 多通道量子亏损理论 电子-电子关联 自电离里德伯系列  相似文献   

4.
在卷曲法计算得到的单壁碳纳米管12个非简并的本征频率与手性和管径关系的基础上,继续讨论了简并的本征频率中E1和E2的振动模式,以及其频率与手性和管径的关系. 关键词: 单壁碳纳米管 手性管 振动模式.  相似文献   

5.
On the basis of the decay couplings f 0ππ, K , ηη, ηη′ found earlier in the study of analytical (IJ PC =00++) amplitude in the mass range 450–1900 MeV, we analyze the quark-gluonium content of the resonances f 0(980), f 0(1300), f 0(1500), and f 0(1750) and the broad state f 0(1420 −70 +150 ). The K-matrix technique used in the analysis makes it possible to evaluate the quark-gluonium content both for the states with switched-off decay channels (bare states, f 0 bare ) and for the real resonances. We observe a significant change in the quark-gluonium composition in the evolution from bare states to real resonances, which is due to the mixing of states in the transitions f 0(m 1) → real mesons → f 0 (m 2) responsible for the decay processes as well. For f 0(980), the analysis confirmed the dominance of q component, thus proving the n /s composition found in the study of the radiative decays. For the mesons f 0(1300), f 0(1500), and f 0(1750), the hadronic decays do not allow one to determine uniquely the n , s , and gluonium components, providing relative percentage only. The analysis shows that the broad state f 0(1420 −70 +150 ) can mix with the flavor singlet q component only, which is consistent with gluonium origin of the broad resonance. From Yadernaya Fizika, Vol. 66, No. 4, 2003, pp. 772–785. Original English Text Copyright ? 2003 by Anisovich, Nikonov, Sarantsev. This article was submitted by the authors in English.  相似文献   

6.
We study the singularity of the surface that represents the masses of the isolated doublet of heavy, neutral Higgs bosons, H 2H 3, in a toy model based on the MSSM with CP violation, in parameter space. These two heavy, neutral Higgs bosons are coherent and, for large values of the masses, nearly degenerate. In this scenario, mixing between the mass eigenstates of the H 2H 3 system could be very large and exact degeneracy is possible. As function of the Lagrangian parameters, the physical mass of the doublet has an algebraic branch point of rank one at the exceptional point where the two masses are equal. The real and imaginary parts of the masses in the doublet have branch cuts that start at the same branch point but extend in opposite directions in parameter space. Associated with this branch point, the propagator of the mixing doublet of neutral heavy Higgs bosons has a double pole in the complex s-plane of the energy squared. We computed the mass surface of the isolated doublet of H 2H 3 bosons as function of the Lagrangian parameters in the neighbourhood of the exceptional point in a toy model of the system H 2H 3. We also computed the trajectories of the poles of the transition matrix for values of the Lagrangian parameters close to the exceptional point and explained the characteristic change of identity seen in these trajectories in the s-plane as a manifestation of the topology of the two-sheeted mass surfaces in the space of Lagrangian parameters.  相似文献   

7.
Absorption spectra of β -carotene in 31 solvents are measured in ambient conditions. Solvent effects on the 0--0 band energy, the bandwidth, and the transition moment of the S0 → S2 transition are analysed. The discrepancies between published results of the solvent effects on the 0--0 band energy are explained by taking into account microscopic solute-solvent interactions. The contributions of polarity and polarizability of solvents to 0--0 band energy and bandwidth are quantitatively distinguished. The 0--0 transition energy of the S2 state at the gas phase is predicted to locate between 23000 and 23600~cm-1.  相似文献   

8.
The spectra of luminescence and magnetic circular polarization of luminescence in the 1 D 23 F 4 emission band in thulium:yttrium-aluminum garnet Tm3+:YAG (Tm3+:Y3Al5O12) have been investigated at temperatures T = 78 and 293 K, respectively. Based on the analysis of the magnetooptical and optical spectra, the optical transitions between the Stark sublevels of the 3 F 4 and 1 D 2 multiplets in Tm3+:YAG were identified. It is shown that the symmetry and energies of the Stark sublevels of the 3 F 4, 1 D 2, and 3 H 6 multiplets, found experimentally from magnetic and magnetooptical studies, confirm the results of theoretical calculations of the energy spectrum of the rare earth Tm3+ ion in YAG. Original Russian Text ? U.V. Valiev, J.B. Gruber, I.R. Gapdulkhakov, N.I. Juraeva, A.K. Mukhammadiev, Sh.A. Rakhimov, I.S. édel’man, 2009, published in Optika i Spektroskopiya, 2009, Vol. 106, No. 6, pp. 937–944.  相似文献   

9.
通过显微光致发光技术和显微拉曼(Raman)技术研究了半绝缘GaAs (SI-GaAs)晶体的带边附近的发光. 在光荧光谱中,观察到在高于GaAs带边0.348eV处有一个新的荧光峰. 结合Raman谱指认此发光峰来源于GaAs的E0Δ0能级的非平衡荧光发射. 同时, 通过研究E0Δ0能级的偏振、激发光强度依赖关系,以及温度依赖关系说明E0Δ0能级与带边E0共享了共同的导带位置Γ6,同时这也说明在GaAs中主要是导带的性质决定了材料的光学行为.同时,通过与n-GaAs和δ掺杂GaAs相比较,半绝缘GaAs晶体的E0Δ0能级的发光峰更能反映GaAs电子能级高临界点E0Δ0的能量位置和物理性质. 研究结果说明显微光致发光技术是研究半导体材料带边以上能级光学性质的一种非常有力的研究工具. 关键词: 半绝缘GaAs 显微光致发光 自旋轨道分裂  相似文献   

10.
李慧  林鹏  张春熹 《物理学报》2009,58(1):158-164
考虑系统噪声和时滞,利用L2L控制理论研究了有leader的二阶定拓扑多智能体系统的协调一致问题.工程应用中控制输出的极大值经常需控制在一定范围内,并且考虑系统对位置变量和速度变量限制的范围不同,分别针对位置和速度的控制输出设计了加权系数;进而建立了多智能体系统的数学模型.对有时滞和无时滞的两种网络拓扑,利用李亚普诺夫函数,分析了多智能体系统在满足L2L关键词: L2L控制')" href="#">L2L控制 多智能体系统 一致问题 时滞  相似文献   

11.
采用中红外波段连续可调谐二极管激光器和自行研制的低温吸收池, 测量了温度为296 K, 252 K, 213 K, 173 K时, 3.38 μm附近13CH4分子的四条跃迁谱线的氮气和空气加宽光谱; 首次通过实验获得空气和氮气对13CH4分子的碰撞加宽系数, 以及谱线加宽系数的温度依赖系数. 实验过程中, 利用Voigt线型对所测量的光谱进行拟合. 实验结果表明, 氮气和空气对13CH4分子的碰撞诱导加宽系数随温度的降低而增大; 相同温度下, 氮气对13CH4分子的碰撞加宽系数普遍大于空气加宽系数. 实验数据为地球和外星体大气遥感探测提供了依据.  相似文献   

12.
We consider near-threshold a 0(980)-meson production in πN and NN collisions. An effective Lagrangian approach with one-pion exchange is applied to analyze different contributions to the cross section for different isospin channels. The Reggeon exchange mechanism is also evaluated for comparison. The results from πN reactions are used to calculate the contribution of the a 0 meson to the cross sections and invariant mass distributions of the reactions and ppppK + K . It is found that the experimental observation of a 0 + mesons in the reaction is much more promising than the observation of a 0 0 mesons in the reaction ppppK + K . Effects of isospin violation in the reactions pNda 0, pd3He(3H)a 0, and dd4Hea 0, which are induced by a 0(980)-f 0(980) mixing, are also analyzed. From Yadernaya Fizika, Vol. 66, No. 1, 2003, pp. 155–174. Original English Text Copyright ? 2003 by Kondratyuk, Bratkovskaya, Grishina, Büscher, Cassing, Str?her. This article was submitted by the authors in English.  相似文献   

13.
气溶胶颗粒的吸湿性决定了其尺寸、浓度、化学组成以及相态,从而显著影响着全球气候、大气异相化学以及人类健康。运用在线、原位、连续扫描衰减全反射傅里叶变换红外光谱(ATR-FTIR)技术, 结合线性湿度(RH)控制系统,实现了RH连续变化条件下气溶胶FTIR-ATR光谱的快速测量。根据水弯曲振动谱带(~1 640 cm-1)峰面积随RH的变化,得到了(NH4)2SO4,NH4NO3和(NH4)2SO4/NH4NO3混合气溶胶的质量增长因子(MGFs)、潮解点(DRH)和风化点(ERH)。与气溶胶的E-AIM模型预测值相比较,实验结果表现出良好的一致性,证实该方法是一种测量大气气溶胶MGFs,ERH和DRH的快速测量方法。  相似文献   

14.
The Fourier transform infrared (FTIR) spectrum of the ν8 fundamental band of ethylene-d3 (C2HD3) was recorded with a unapodized resolution of 0.0063 cm−1 in the wavenumber region of 840–980 cm−1. By assigning and fitting a total of 738 infrared transitions using a Watson’s A-reduced Hamiltonian in the Ir representation, rovibrational constants for the upper state (ν8 = 1) up to all five quartic centrifugal distortion terms were derived for the first time. The root-mean-square (rms) deviation of the fit was 0.00076 cm−1. The ground state rovibrational constants of C2HD3 were also determined for the first time by a fit of 450 combination-differences from the present infrared measurements, with rms deviation of 0.00075 cm−1. Local frequency perturbations were not detected in the C-type ν8 band of C2HD3 which is centred at 918.73199 ± 0.00007 cm−1.  相似文献   

15.
CH4/H2和CH4/He体系等离子体发射光谱分析   总被引:1,自引:1,他引:0       下载免费PDF全文
 在CH4/H2和CH4/He和CH4/He两种系统中,利用光学发射谱技术对螺旋波放电产生低压甲烷等离子体内活性粒子的光学发射特征进行了原位诊断。在实验中,两种体系下同时都测得的主要荷电粒子为CH,Ha,Hb,Hg以及H2等。研究了各实验参数对这些活性粒子CH, Ha,Hb以及Hg的发射光谱强度的影响。结果表明:在CH4/H2体系下,随着射频功率的增大,Ha,Hb,Hg以及CH基团的相对强度都随着增加,而当放电气压变化时它们都呈现先增大而后减小的趋势。在CH4/He体系下,随射频功率的增加,Ha,Hb,Hg以及CH相对强度变化的总体趋势也都是先增加而后减小,当工作气压增加时,Ha,Hb以及Hg的相对强度变化也是呈现先增大而后减小,但CH基团的相对强度却是逐渐减小的;这些结果为等离子体沉积各种薄膜过程的理解及制备工艺参数的调整提供了参考。  相似文献   

16.
李心梅  阮亚平  钟志萍 《物理学报》2012,61(2):023104-223
本文在多通道量子数亏损理论(MQDT)框架下,利用相对论多通道理论(RMCT),分别在冻结实近似、 考虑Δl=-1的偶极极化效应、Δl=+1的偶极极化效应、Δl=± 1的偶极极化效应、伸缩模效应以及同时考虑偶极极化效应和伸缩模效应等不同层次近似下,系统地计算了碱金属Li, Na, K, Rb, Cs和Fr七个里德伯系列的能级,即ns2S1/2, np2P1/2, np2P3/2, nd2D3/2, nd2D5/2, nf2F5/2nf2F7/2.计算结果表明,电子关联效应对碱金属原子的里德伯能级的影响很大.总的来说,偶极极化效应比伸缩模效应重要,而在偶极极化效应中, Δl = + 1的偶极极化效应比Δl = - 1的偶极极化效应重要.但对于Na的ns2S1/2,(nd2D3/2,nd2D5/2)里德伯系列的能级,和Li的(np2P1/2,np2P3/2)里德伯系列的能级,是伸缩模效应比较重要.  相似文献   

17.
车广灿  陈立泉 《物理学报》1981,30(9):1219-1224
本文用差热分析和X射线衍射方法对Li2SO4-Li2B2O4和Li2SO4-[NH4]2SO4两个赝二元系相图进行了研究。Li2SO4-Li2B2O4是共晶体系,共晶温度为720℃ 关键词:  相似文献   

18.
19.
于晶杰  肖志国  宁桂玲 《发光学报》2013,34(12):1561-1566
采用高温固相法合成了荧光体Ba10(PO44(SiO42:Ce3+和Ba10(PO44(SiO42:Eu2+,研究了两种荧光体的光谱特性。结果表明,两者都呈现较强的宽带激发特征。根据同种基质中Eu2+和Ce3+两种离子光谱特征的相关性,通过测得的Ba10(PO42(SiO42基质中Ce3+的光谱数据估算了Ba10(PO42(SiO42:Eu2+中Eu2+的斯托克斯位移(ΔS)和激发能量,估算结果与Ba10(PO42(SiO42:Eu2+样品的光谱分析结果十分吻合。Ba10(PO42(SiO42:Eu2+可以同时被紫光和蓝光激发,发出偏白的绿光,可用作白光LED的荧光粉。  相似文献   

20.
陈金全  高美娟  王凡 《物理学报》1978,27(3):237-246
本文给出了核物理中常用的SU3?SO3(f=1—6)和SU4?SU2×SU2波函数在Gelfand表象中的展开系数。 关键词:  相似文献   

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