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《Molecular physics》2012,110(21-22):2773-2779
A preliminary analysis of the 2CH excitation band in C2H2–N2O in the 1.5 µm range (K. Didriche, C. Lauzin, P. Macko, M. Herman and W.J. Lafferty, Chem. Phys. Letters 469, 35 (2009).), only considering 117 low J-, and Ka - vibration-rotation lines, is significantly extended thanks to the analysis of new spectra including very regular series of lines with J/Ka up to 31/15. 1271 b-type lines were assigned. Perturbations are briefly discussed. The rotational temperature in the experiments is estimated to be 20?K and the upper state mean half-time is 1.6?ns for non perturbed levels. The previous analyses of the 2CH + torsion band in C2H2–N2O and in C2H2–CO2 (C. Lauzin, K. Didriche, T. Földes and M. Herman, Mol. Phys. 109, 2105 (2011).), are also extended to include 286 and 234 lines, respectively, also correcting for calibration errors. New rotational constants are obtained using a rigid rotor Hamiltonian by simultaneously fitting the ground, 2CH and 2CH + torsion states in C2H2–N2O, and the latter state, only, in C2H2–CO2. 相似文献
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SystematicDiscrepancyoftheEnthalpiesofFormationBetweentheG2TheoreticalandtheExperimentalValuesforO+2
《原子与分子物理学报》1996,(4)
Keywords:SystematicDiscrepancyEnthalpyG2ExperimentIntroducedbyPopleandco-workers〔1-4〕,thewelknownG2abinitioprocedure,asarelia... 相似文献
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Czechoslovak Journal of Physics - 相似文献
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Mojtaba Rezaei N. Moazzen-Ahmadi A.R.W. McKellar 《Journal of Molecular Spectroscopy》2012,272(1):19-22
Infrared spectra of C2D2–water complexes are studied in the 4.1 μm region of the C2D2 ν3 fundamental band using a tunable diode laser source to probe a pulsed supersonic slit jet. Relatively large vibrational red shifts (?27.7 to ?28.0 cm?1) are observed which are more easily interpretable than for the analogous C2H2 vibration thanks to the absence of Fermi resonance effects for C2D2. Noticeable homogeneous line broadening leads to estimates of upper state predissociation lifetimes of about 0.5, 0.9 and 1.1 ns for C2D2–H2O, –HDO, and –D2O, respectively. Transitions involving Ka = 0 and 1 levels are observed for C2D2–HDO, but there is a puzzling absence of Ka = 1 for C2D2–H2O and C2D2–D2O. 相似文献
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Spectra of the weakly bound CO2–C2H2 and CO2–C2D2 complexes are observed in the regions of CO2 ν3 (≈ 2349 cm?1) and C2D2 ν3 (≈ 2440 cm?1) fundamental vibrations, using an infrared optical parametric oscillator to probe a pulsed supersonic slit-jet expansion. Five bands are measured and analysed: the fundamental asymmetric stretch of the C2D2 component, two combination bands involving the out-of-plane torsional vibrations (C2D2 ν3 + torsion and CO2 ν3 + torsion) for CO2–C2D2, and two combination bands involving an intermolecular in-plane bending vibration for CO2–C2H2 and CO2–C2D2. The resulting intermolecular frequencies are 61.408(1), 54.5(5), 39.9(5), and 39.961(1) cm?1 for CO2–C2H2 and CO2–C2D2 in-plane vibrations, and CO2–C2D2 out-of-plane torsional vibrations in CO2 and C2D2 regions, respectively. This is the first experimental determination of these intermolecular vibrational frequencies. 相似文献
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HUA Da-Yin WENG Xiao-Yan WANG Lie-Yan CHEN Ting 《理论物理通讯》2008,49(4):960-964
A lattice gas model is presented for the A2 +2B2 → 2B2A reaction system with particle diffusion in two dimensions. In the model, B2 dissociates in the random dimer-filling mechanism and A2 dissociates in the end-on dimer filling mechanism. A reactive window appears and the system exhibits a continuous phase transition from a reactive state to a "B + vacancy" covered state with infinitely many absorbing states. When the diffusion of particle B is considered, there are only two absorbing states. It is found that the critical behavior of the continuous phase transition changes from the directed percolation (DP) class to the pair contact process with diffusion (PCPD) class. 相似文献
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The temperature dependence of the Raman spectra of FeCl2 2H2O demonstrate the existence of level crossing and repulsion between a one-magnon and a nearby phonon excitation. The magnon-phonon coupling constant derived from a two oscillator decoupling technique shows the same variation with temperature as the measured sublattice magnetization. In addition the temperature dependences of the energies and of the half-widths of the uncoupled magnon and phonon states are derived and discussed.A project of the Sonderforschungsbereich 65 Festkörperspektroskopie Darmstadt-Frankfurt, supported by the Deutsche Forschungsgemeinschaft 相似文献
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与YBCO薄膜相比,Tl2Ba2CaCu2Ox薄膜具有更高的Tc和更好的抗湿性能,所以Tl2Ba2CaCu2Ox薄膜器件不仅在液氮温度下具有更好的稳定性,而且在室温下具有更长的存放寿命.我们用磁控溅射的方法分别在24°和36.8°的STO双晶衬底上外延出Tl2Ba2CaCu2Ox薄膜并制备成晶界结DC-SQUID,比较了二者由于晶界夹角不同而产生的性能差异,并给出可工作在95K的DC-SQUID干涉曲线;对工作在77K的Tl2Ba2CaCu2Ox和YBCO薄膜双晶DC-SQUID,比较了二者在噪声特性及临界电流和结电阻随温度变化等特性,并对结果作了讨论. 相似文献
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针对金属角锥反射镜的加工装配误差对传输光路的影响,研究了金属角锥反射镜二面角误差与反射光束的关系。详细分析了金属角锥反射镜表面面型及形态对反射特性的影响,并对不同角锥反射镜各个区域的反射率进行测量对比,对金属角锥反射镜的偏振特性也进行分析。研究结果表明,应用于HL-2M 装置CO2 色散干涉仪中金属角锥反射镜的表面面形加工精度应在0.3μm 之内,二面角的装调误差宜为正公差且控制在30'内,且表面镀膜的膜层牢固不易脱落。 相似文献
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The phase mode of reflected beam (PMRB) is the most important factor for determining the far field diffraction pattern (FFDP)
with laser retroreflector (LR). Based on the structure of LR and ray tracing method, the additional optical path difference
of the light beam with various incident angle passed through no ideal LR is induced. Combined with the expression of incident
beam, the mathematical PMRB is established for LR with dihedral angle and flatness error under different incident beam conditions.
The FFDP with the phase mode is simulated for Champ laser retroreflector, which validates the correctness of PMRB. 相似文献
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角锥棱镜常应用于光电跟踪、卫星通信、干涉仪等领域.在一些特殊应用场合中,要求经角锥棱镜反射的光束具有一定的发散角,以实现对距离激光器较远位置处探测器的覆盖.由于标准角锥棱镜不具备对光束发散的功能,本文利用含二面角误差的角锥棱镜对反射光束的不均匀发散特性,提出利用角锥棱镜阵列实现对反射光束均匀发散的方法和设计原则.采用衍射光学理论分析了所提方法及其设计原则的可行性,并依此设计了一个发散半角为0.5 mrad的角锥棱镜阵列.分析了光束参数、结构参数对反射光束远场衍射特性的影响,结果表明,入射光斑强度分布对反射光束发散半角没有影响,当角锥阵列满足点光源条件时,传输距离对反射光斑的角向均匀性没有影响;当阵元数超过一定值时,均匀性不再显著变化,但反射光斑的强度将进一步增加.在工程应用中,角锥棱镜阵列安装方位角误差对反射特性影响不显著,但角锥棱镜二面角的加工精度对反射特性影响较大,可通过进一步增加阵元数加以解决. 相似文献
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减小外差干涉一次谐波非线性误差的方法 总被引:2,自引:0,他引:2
为了补偿激光外差干涉纳米测量中的非线性误差,提出了一种减小非线性误差的一次谐波方法。基于全反射理论分析了镀膜实体角锥棱镜反射光偏振特性,并由此推导出角锥棱镜反射光偏振特性及测量角锥棱镜以其运动方向为轴线的轴向旋转对激光外差干涉非线性误差一次谐波的影响模型。理论分析表明,测量角锥棱镜以其运动方向为轴线的轴向旋转会减小非线性误差一次谐波,当测量角锥棱镜轴向旋转97°时,可使非线性误差一次谐波达到最小,约为原有非线性误差一次谐波分量的1/20倍。当激光器出射的两束线偏振光存在6°非正交误差时,镀膜实体测量角锥棱镜轴向旋转角度从0°增加到97°,非线性误差一次谐波由5.30 nm减小到0.30 nm。 相似文献
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An acute retroreflector having dihedral angles of 45, 60 and 90 deg exactly reflects incident rays in the opposite direction.
Beam pattern or wave front of the reflected light of the acute retroreflector can be controlled by tuning dihedral angles.
We present here a new method for calculating the reflected wave front of the acute retroreflector, in which the wave front
is calculated with high accuracy and in a shorter calculation time than by the conventional ray trace method. 相似文献