共查询到20条相似文献,搜索用时 125 毫秒
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王守宇 马英君 T.Komatsubara 刘运祚 张玉虎 梁国栋 K.Furuno T.Hayakawa J.Mukai Y.Iwata T.Morikawa G.B.Hagcmann G.Sletten J.Nyberg D.Je 《中国物理 C》2004,28(5):491-494
利用融合蒸发反应116Cd(14N,4n)126Cs布居了126Cs的高自旋态.观测到了100多条新的γ跃迁和相应的能级,建立了双奇核126Cs由9个转动带构成的能级纲图.尝试性地指定了大部分能级的自旋和宇称以及各转动带的Nilsson单粒子组态.极大地丰富了已有的实验结果. 相似文献
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宋立涛 周小红 张玉虎 郭应祥 雷相国 郑勇 柳敏良 G.de Angelis N.Marginean A.Gadea D.R.Napoli M.Axiotis C.Rusu T.Martinez 《中国物理 C》2005,29(8):736-740
通过重离子熔合蒸发反应和在束核谱学实验方法研究了奇A 核183Au的高自旋态能级结构. 扩展并更新了183Au的能级纲图. 首次建立了183Au的πi13/2转动带的能量非优先带. 分析并讨论了183Au中πh9/2转动带的能量非优先带和πf7/2转动带间的相互作用. 相似文献
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采用提拉法成功生长尺寸为φ30 mm× 75 mm的15at.%Yb3+:Gd2SiO5单晶, 并用Reitveld全谱拟合方法确定了其晶格常数、原子坐标和温度因子等参数. 用吸收光谱计算了Yb3+离子2F7/2↔ 2F5/2能级跃迁的振子强度、谱线强度、跃迁概率、 能级寿命和积分发射截面等光谱参数, 并根据激光性能评估得出结论: 表明该晶体具有较大的阈值特性, 有望采用大功率激光二极管泵浦实现可调谐或超快激光输出. 相似文献
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利用在束γ谱学技术和173Yb(18O, 4n)熔合蒸发反应研究了187Pt的高自旋态能级结构. 建立了包括3个转动带的187Pt高自旋态能级纲图. 基于187Pt周围核结构的系统学和比较带内B(M1)/B(E2)比率的实验值和理论值, 建议上述3个转动带的组态
分别为11/2+[615], 7/2-[503]和1/2-[521]. 对各转动带的带交叉频率、顺排增益、旋称劈裂等进行了讨论. 相似文献
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The millimeter- and submillimeter-wave spectrum of 13CD2F2 present in natural abundance in methylene fluoride-d2 (CD2F2) has been measured in the region 230-380 GHz. The spectrum was recorded using a frequency-modulated millimeter- and submillimeter-wave spectrometer. More than 200 rotational transitions in the ground state of 13CD2F2 with J≤45 and Ka≤8 have been assigned. A combined weighted least squares fit of the newly assigned transitions with previously reported microwave data has been carried out in the Watson's A- and S-reduced Hamiltonian. The data have been fitted with a standard deviation approaching the experimental accuracy, to provide improved values for the rotational and quartic centrifugal distortion constants, including sextic distortion constants for the ground state of 13CD2F2. 相似文献
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The microwave spectrum of boron chloride difluoride, BClF2, has been investigated in the region 26.5–40.0 GHz. R-branch transitions belonging to the isotopic species 11B35Cl19F2, 11B37Cl19F2, and 10B35Cl19F2 have been observed and the derived rotational constants yield the following ground-state structural parameters: , , < FBF = 118.1 ± 0.5°. The ground-state rotational constants of the most abundant species 11B35Cl19F2 are: A0 = 10 449.32 ± 0.13, B0 = 4705.811 ± 0.020, C0 = 3239.702 ± 0.026 MHz, ΔJK = 8.9 ± 1.7, and ΔJ = 1.86 ± 0.48 KHz. The asymmetry parameter κ = ?0.593291 and the inertial defect δ0 = 0.2361 amu Å2 which is consistent with that expected for this type of molecule if planar. The 35Cl quadrupole coupling constants for 11B35Cl19F2 are χaa = ?42.8 ± 1.0, χbb = 30.2 ± 1.5, χcc = 12.6 ± 1.5 MHz with the asymmetry parameter η = 0.41. 相似文献
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H.F. Chambers R.W. Kirk J.K. Thompson M.J. Warner P.M. Wilt 《Journal of Molecular Spectroscopy》1975,58(1):76-86
The infrared spectrum of HC13F3 is reported for the first time. Fundamental frequency shifts due to carbon-13 substitution have been measured and rotational analyses of several of the fundamental and combination bands are given. Coriolis x-y and Fermi perturbations are evident in several of the bands. Table VI summarizes the data obtained in this study. 相似文献
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The solution E.S.R. spectra of radicals of the type R?F2 exhibit marked line broadening attributable to rotational modulation of the 19F anisotropic hyperfine interactions. This dipolar broadening is restricted to lines associated with the triplet state of the two equivalent 19F nuclei and for slowly rotating radicals only the singlet state line is readily detectable. 相似文献
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C.I.M. Beenakker P.J.F. Verbeek G.R. Möhlmann F.J. de Heer 《Journal of Quantitative Spectroscopy & Radiative Transfer》1975,15(4):333-340
The intensity distribution in the rotational and vibrational structure of the CH(A2Δ ? X2Π) spectrum, formed by dissociative excitation of acetylene by electron impact, is analysed. This spectrum is built-up from three overlapping bands, namely, the 0-0, 1-1 and 2-2 bands. The intensity distribution in the rotational structure of the 0-0 band is determined by an analysis of the free rotational lines of the R-branch. The intensity distribution in the other bands is analysed by a comparison of the spectrum with a spectrum simulated on the computer. In this way, the overlap of the various rotational and vibrational transitions is taken into account. It turns out that the distribution of molecules over the rotational levels can be described by assuming one Boltzmann distribution for each vibrational level. 相似文献
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Laurent Margulès Jean Demaison Ilona Merke Maud Rotger 《Journal of Molecular Spectroscopy》2009,256(2):232-237
The ground state rotational spectrum of the near-spherical top molecule S18O2F2 (sulfuryl fluoride) has been measured from 50 to 700 GHz. As for the parent isotopologue, S16O2F2 [K. Sarka, J. Demaison, L. Margulès, I. Merke, N. Heineking, H. Bürger, H. Ruland, J. Mol. Spectrosc. 200 (2000) 55-64], it was necessary to use a non-reduced Hamiltonian in order to obtain a satisfactory fit. It was possible to determine six quartic centrifugal distortion constants (instead of five for a standard asymmetric top) and five sextic constants (one of them not existing in the reduced Hamiltonian) could also be determined. This ground state level has also been analysed thanks to a tensorial formalism developed in Dijon. Only two tensorial sextic constants are fixed to zero, all others have been adjusted. Although S18O2F2 is less spherical than S16O2F2, the analysis was more difficult. It is partly due to the fact that S18O2F2 is oblate whereas S16O2F2 is prolate. The experimental quartic centrifugal distortion constants were found in good agreement with those calculated from the force field, confirming the correctness of the analysis. 相似文献
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The gas phase electron resonance spectrum of SeO in its 3Σ and 1Δ states has been studied. Values of the rotational constant B 0 and ‘spin-spin’ splitting parameter λ in the 3Σ state, previously determined from the ultraviolet spectrum, are shown to be consistent with the electron resonance results, and we are also able to estimate the spin-rotation interaction constant. In addition, the 3Σ spectrum shows 77Se hyperfine structure. The 1Δ spectrum yields values for the rotational constant (and hence bond length) and rotational g factor. 相似文献
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Based on measurements made by mass-resolved 1 + 1′ + 1″ resonance-enhanced multiphoton ionization spectroscopy, we have determined new molecular constants describing the rotational and fine structure levels of the B, D, E, and F states of the most abundant isotopic variant 208Pb19F, and we summarize the spectroscopic constants for all the know electronic states of the radical. Many spectroscopic constants for the isotopologues 206Pb19F and 207Pb19F have also been determined. The symmetry of the D-state is found to be 2Π1/2, and the F-state is found to be an Ω = 3/2 state. 相似文献
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The pure rotational Raman spectrum of nitrogen dioxide has been observed and shown to be consistent with existing determinations of molecular parameters. Upon observation at 600 Torr pressure and 0.4 cm−1 resolution a well-defined rotational spectrum is obtained. This spectrum is overlaid with a number of fluorescence lines. The fluorescence lines are separated from the Raman spectrum by a comparison of Stokes and anti-Stokes branches of the rotational spectrum. Out of seven strong fluorescence lines seen with 5145 Å excitation, five probably are identifiable with vibration-rotation fluorescence progressions observed by Abe.The most striking feature of these observations is the potential use of the resonance Raman effect for the analysis of complicated electronic spectra. When this rotational spectrum is observed with excitation by 5309 Å or 5145 Å excitation, the Raman spectrum follows a-axis selection rules and the Q-branches are in the noise level or barely out of it. However, at 4880 Å the ΔK = 2Q-branches become a major feature of a spectrum, indicating that an appreciable part of the absorption at this wavelength is occurring through the operation of b- or c-axis selection rules. These findings are consistent with present notions of a 2B2 excited state dominating absorption at longer wavelengths, while at shorter wavelengths a 2B1 excited state becomes important. Given a tunable laser, one could map the relative importance of these two possible selection rules for NO2 without any theoretical analysis more sophisticated than that presented in this paper.A simplified statement of the selection rules for resonance rotational Raman spectra of asymmetric tops has been developed in the course of this investigation. No attempt has been made to refine the rotational parameters of NO2 since all of the lines seen areunresolved multiplets. Our data should be regarded as a search spectrum preliminary to investigation on a high resolution instrument. 相似文献
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《Journal of Molecular Spectroscopy》1987,126(2):443-459
The far-infrared spectrum of methyl amine has been studied in the region 40 to 350 cm−1 by Fourier transform spectroscopy with an apodized resolution of 0.005 cm−1 or better. Both the pure rotational spectrum and the spectrum of the fundamental torsional band have been assigned. This paper reports the ground state constants obtained from a global fitting of a data set including ground state microwave transitions from the literature, as well as far-infrared pure rotational ground state transitions and ground state combination differences from the torsional band obtained in this work. Slightly over 1000 energy differences for the ground state with 0 ≦ K ≦ 19 and K ≦ J ≦ 30 were fit to 30 molecular parameters from a group theoretical formalism developed earlier, and a standard deviation of ±0.00063 cm−1 was obtained. An ambiguity (noted earlier in the microwave literature) in the determination of the structural parameter ϱ, which arises when two large amplitude motions are present in the molecule, can be understood and resolved using the present formalism. 相似文献