dicesium | 12184-83-7

• 分子结构分类: 无机化合物 - 均相金属化合物 - 均相碱金属化合物
• 英文名称: dicesium
• 英文别名: cesium
• CAS: 12184-83-7
• 化学式: Cs₂
• 分子量: 265.811
• InChiKey: KNJJHXOVFHKJEY-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.76
• 重原子数：
  2
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  dicesium 以 neat (no solvent) 为溶剂， 生成 caesium
  参考文献：
  名称：

  Photolytic spectroscopy of simple molecules. I. The production of 5 ²D atoms from Cs₂

  摘要：

  A two-photon technique is reported for the measurement of relative cross sections for the selective photolysis of simple molecules into particular product channels. In a demonstration of this method two independently tunable dye lasers were used to sequentially dissociate molecules of Cs2 for wavelengths in the visible range and then to excite the resulting products to Rydberg states which could be readily ionized for detection. With this system the spectra were determined for the selective photolysis of Cs2 into product atoms in the 5 2D3/2 and 5 2D5/2 states. Two relatively broad absorption bands were found, each of which led to the preferential population of a different fine structure components of the 5 2D products. Analysis of the photolysis spectra indicated that both dissociation and predissociation mechanisms were responsible and led to the identification of a new 1Σu and 3Σu state correlated with the 5 2D atomic states.

  DOI：

  10.1063/1.441238
• 作为产物：
  描述：

  caesium 以 gas 为溶剂， 生成 dicesium
  参考文献：
  名称：

  通过解离的 (2)3Σu+ 态对 Cs2 C 1Πu 和 (2)3Πu 态预解离的干扰效应

  摘要：

  Cs2 分子的激发光谱监测解离的 Cs(6p2P3/2) 原子的发射，通过使用与激光束交叉的脉冲超音速分子束来测量。在 16 600-17 200 cm-1 区域发现了强烈的预解离。观察到具有广泛不对称轮廓的振动进程，这是通过 Kim 和 Yoshihara 对离解的 Cs(6p2P3/2) 原子的电离发现的。(2)3Σu+ 和B 1Πu 态之间的自旋轨道相互作用允许从基态X 1Σg+ 到解离态(2)3Σu+ 的跃迁。(2)3Σu+、(2)3Πu 和C 1Πu 态通过自旋轨道相互作用混合。通过使用三通道模型求解耦合微分方程，计算到混合水平的转移概率，(2)3Πu(v)和C 1Πu(v')。(2)3Σu+ 和(2)3Πu 态之间的耦合大于(2)3Σu+ 和C 1Πu 态之间的耦合。因此，观察到 (2)3Πu←X 1Σg+ 跃迁的线宽很宽......

  DOI：

  10.1063/1.1318737

文献信息

• Measurement of the absolute third-order rate constant for the reaction between Cs + I + He by time-resolved atomic resonance fluorescence monitoring of iodine atoms in the vacuum ultraviolet region {I[6s(²P_J)]–I[5p⁵(²P_3/2)]} coupled with steady atomic resonance fluorescence on atomic caesium [Cs(7²P_J)– Cs(6²S_1/2)] in the visible region
  作者：David Husain、John M. C. Plane、Chen Cong Xiang

  DOI：10.1039/f29858101675

  日期：——

  nm I[5p46s(2P3/2)]–I[5p5(2P3/2)]} using photon counting in the vaccum ultraviolet region. Cs(62S1/2) was monitored by steady atomic resonance fluorescence of the Rydberg doublet at λ= 457 nm [Cs(72PJ)–Cs(62S1/2)] using phase-sensitive detection. We report a measured absolute third-order rate constant of k1(T= 491 K)=(7.9 ± 1.2)× 10–31 cm6 atom–2 s–1, which we believe to be the first measurement of

  我们提出了反应Cs + I + He→CsI + He的绝对三阶速率常数的直接动力学测量。（1）I（5 2 P 3/2）是通过在流动系统中由CH 3 I在来自热管炉的过量原子铯存在下的反应中对CsI进行重复脉冲辐照而产生的。通过时间分辨的原子共振荧光在λ= 178.3 nm I [5 p 4 6 s（2 P 3/2）] – I [5 p 5（2 P 3/2）]监测基态碘原子。}在真空紫外线区域使用光子计数。铯（6 2 S 1/2）通过相变检测在λ= 457 nm [Cs（7 2 P J）–Cs（6 2 S 1/2）]上通过Rydberg doublet的稳定原子共振荧光进行监测。我们报告了测得的绝对三阶速率常数k 1（T = 491 K）=（7.9±1.2）×10 –31 cm 6原子–2 s –1，我们认为这是此类的首次测量。我们还报告了反应I + Cs 2 →CsI + Cs（3）为k
• Raman Spectroscopic Investigation of Matrix Isolated Rubidium and Cesium Molecules:  Rb₂, Rb₃, Cs₂, and Cs₃^,¹
  作者：Andreas Kornath、Anja Zoermer、Ralf Ludwig

  DOI：10.1021/ic990506m

  日期：1999.10.1

  The rubidium molecules Rb(2) and Rb(3) and the cesium molecules Cs(2) and Cs(3) were isolated in argon matrixes and characterized for the first time by Raman spectroscopy. The fundamental frequencies of the dimers were observed at 59.1 cm(-)(1) for the rubidium dimer and 45.8 cm(-)(1) for the cesium dimer. The Raman lines of the rubidium trimer appeared at 38.3 and 53.9 cm(-)(1), and the lines of the

  分子Rb（2）和Rb（3）以及铯分子Cs（2）和Cs（3）在氩气基质中分离，并通过拉曼光谱法进行了首次表征。the二聚体的二聚体基频为59.1 cm（-）（1），铯二聚体为45.8 cm（-）（1）。trim三聚体的拉曼线出现在38.3和53.9 cm（-）（1），铯三聚体的线出现在24.4和39.5 cm（-）（1）。将振动频率与气相频率和密度泛函理论（DFT）计算进行了比较。此外，通过拉曼矩阵光谱观察到在固态氩气中分离的Cs（2）的（1）Pi（u）态的最低振动水平。
• Optically pumped atomic spin orientation and the law of mass action for 2Cs⇄Cs₂
  作者：J. J. Ho、Chongye Wang、R. A. Bernheim

  DOI：10.1063/1.455013

  日期：1988.9

  The effect of optically pumped atomic spin orientation on the atom–dimer equilibrium in cesium vapor has been observed. Such a shift in equilibrium was predicted over two decades ago and is due to the redistribution of spin-determined bonding and antibonding collision trajectories. Orientation of the total spin angular momentum of 6 2S1/2 ground state Cs atoms in the vapor phase was produced by optical pumping with a tunable cw dye laser. A decrease in the equilibrium molecular density resulted and was measured using laser induced fluorescence from the B 1Πu state. The shift in equilibrium is a function of the degree of atomic orientation and could be observed in the temperature range 383–421 K for cesium vapor in a glass cell which also contained a He–N2 buffer gas mixture with a composition ratio of 9:1.
• High resolution laser spectroscopy of the Cs2 C 1Πu state: Perturbation and predissociation
  作者：Shunji Kasahara、Yasushi Hasui、Kyoko Otsuka、Masaaki Baba、Wolfgang Demtröder、Hajime Katô

  DOI：10.1063/1.473536

  日期：1997.3.22

  High resolution spectra of the C 1Πu(v′,J′)−X 1Σg+(v″,J″) transitions of the Cs2 molecule were measured by the technique of Doppler-free optical–optical double resonance polarization spectroscopy. A number of C 1Πu(v⩾13,J) levels were found to be strongly perturbed. Transitions to the perturbing levels were observed, and the energy shifts of e and f levels of the C 1Πu state were studied and identified as originating from perturbations between the C 1Πu and (2)3Π1u states. Molecular constants of the C 1Πu(v=7–18) and (2)3Π1u(v=v0–v0+6) levels were determined. Line splittings were observed for the transitions to the C 1Πu(v=13 and 14,Jf) levels which were identified as hyperfine splittings originating from additional interaction with the (2)3Σu+ state. Remarkable line broadenings were observed in the transitions to the C 1Πu(v>15,Je and f) levels, and were identified as originating from the predissociation through the dissociative (2)3Σu+ state. The repulsive potential curve of the (2)3Σu+ state was estimated to cross that of the C 1Πu state around the outer turning point of the C 1Πu(v=16 or 17) level.
• Study of the chemiluminescent reaction between alkali dimers and oxygen atoms
  作者：H. Figger、R. Straubinger、H. Walther

  DOI：10.1063/1.441820

  日期：1981.7

  The reaction of alkali dimers with oxygen atoms has been studied in a crossed beam experiment. Strong chemiluminescence of the reaction products was observed. It is shown that the luminescence was emitted by alkali atoms from the reaction M2+O→MO+M (M alkali atom). M can be excited up to the exoergicity of this reaction at least in the cases M = Cs and Na. For M = Cs, detailed rate constants for the excitation of the different excited states have been determined using both laser induced fluorescence and chemiluminescence. The rates decrease nearly exponentially as a function of the excitation energy. They partly follow the expectation of statistical theories. Absolute reaction cross sections have been determined for all of the reactions investigated. They agree partially with those predicted by the harpoon model.