A Study of Reaction and Scattering of Alkali-earth Metals by Using Crossed Molecular Beams.

利用交叉分子束研究碱土金属的反应和散射。

• 批准号: 61460040
• 负责人: SAKURAI Katsumi
• 金额: $ 4.03万
• 依托单位: Department of Pure and Applied Sciences, The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61460040/
• 关键词: Laser induced fluorescence; Vibrational-rotational energy transfer; Radical beam; Molecular beam spectroscopy; 分子線分光

The purposes of this study are to develop new method and to measure the cross-section for the formation of alkali-earth compound molecules in gas-beam reaction and cross-beam reaction as a function of the energies of the reagent and reactant molecules. These molecules are fortunately good candidates for the laser study of reaction dynamics.1) The cross-beam of Ar and metastable Ca in ^3P state was studied to meseasure the cross-section for energy transfer between fine-structure levels of Ca ^3P state. A pumping laser puped out all atoms form a certain J level and the degree of repopulation by collision of Ar beam was meseasured by a probe laser to determine the cross-section for energy transfer.2) We have measured the level to level vibrational-rotational energy transfer rate in I_2- He supersonic molecular beam. The intensities of fluorescence induced directly by laser and indirect fluorescence from the energy transfered levels were measured as function of exciting position and observing position along molecular beam and the rates for the level to level relaxation were determined from contour analysis of the observed spectra.3) The temperature and the pressure are varying drastically, say three orders in magnitude, along the expanding jet. We have proposed that we should use this system to study the energy dependence of reaction cross-section. We have constructed a discahrage free expansion jet aparatus and many radical species were spectroscopically observed. We have developed a measurement system for spacially resolved spectroscopy to strudy reaction dynamics in this system.4) Diode laser probe system for state analysis in reaction study and suitable for detection of atomic beam has been developed by using diode laser of which tunability was 30 mn.

本研究的目的是发展一种新的方法，并测量在气束反应和横束反应中碱土化合物分子的形成截面随试剂和反应物分子能量的变化。值得庆幸的是，这些分子是激光研究反应动力学的很好的候选者。1)研究了~3P态Ar和亚稳态Ca的交叉光束，测量了Ca^3P态精细结构能级之间的能量传递截面。用抽运激光将所有原子从某一J能级射出，用探测激光测量Ar束碰撞的再布居程度以确定能量转移的截面。2)我们测量了I_2-He超音速分子束的能级到能级的振动-转动能量转移率。测量了激光直接诱导的荧光强度和能量传递能级的间接荧光强度随激发位置和沿分子束的观察位置的变化，并通过对观测光谱的等高线分析确定了能级到能级的驰豫速率。3)温度和压力沿扩张的射流有很大的变化，大约三个数量级。我们建议用这个系统来研究反应截面的能量依赖性。我们构建了一种无泄放膨胀的喷射隔膜，并用光谱观察到了许多自由基物种。4)利用可调谐30mN的半导体激光器研制了用于反应研究中状态分析的适合原子束探测的半导体激光探测系统。

项目成果

H,Baba and K.Sakurai: "Determination of the level to level rate constants for rotational vibrational energy transfer of I^2 (B^3IIu) - He in a supersonic jet" In preparation and to be submitted to J. Chem. Phys.

H，Baba 和 K.Sakurai：“确定超音速射流中 I^2 (B^3IIu) - He 旋转振动能量转移的能级到能级速率常数” 正在准备中并将提交给 J. Chem。

K. Ohkawa;H. Baba;K. Sakurai: Japan. J. Appl. Phys.

K.大川；H.

K,Ohkawa, H,Baba and K,Sakurai: "The radiative lifetime measurement of the upper state of green system of Ca_2 by a mode locked Ar ion laser" In preparation and to be submitted to Japan. J. Appl. Phys.

K，Ohkawa，H，Baba和K，Sakurai：“通过锁模Ar离子激光器对Ca_2绿色系统上态的辐射寿命测量”正在准备中并将提交给日本。

K. Sakurai;N. Yamada;H. Baba: Optics Letters.

K.樱井;N.

K,Sakurai, N,Yamada and H,Baba: "The internal second harmonic radiation from GaAlAs lasers for absorption spectroscopy" In preparation and to be submitted to Optics Letters.

K,Sakurai, N,Yamada 和 H,Baba：“用于吸收光谱的 GaAlAs 激光器的内部二次谐波辐射”正在准备中并将提交给《光学快报》。