Studies on high-resolution spectroscopy and photodissociation by laser double resonance, molecular beam, and magnetic field

激光双共振、分子束和磁场的高分辨率光谱和光解研究

• 批准号: 62430005
• 负责人: KATO Hajime
• 金额: $ 15.62万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62430005/
• 关键词: Laser; Spectroscopy; Magnetic field; Molecular beam; Predissociation; Photodissociation; Alkali metal; ドプラ-フリ-; 高分解能; 量子ビート; コヒーレンス; レーザー分光; レーザー; ドプラーフリー; 分光定数; ポテンシャル曲線

We developed several techniques of Doppler-free high resolution spectroscopy: (1) Doppler-free modulated saturation fluorescence spectroscopy, (2) Dappler-free polarization saturation absorption spectroscopy, (3) Molecutar beam crossed laser emission selective excitation spectroscopy, (4) Two color optical-optical double resonance modulated polarization spectrosc opy.Using these techniques, we established the following results. (A) Perturbation between two electronic states are studied on the basis of the energy shifts, change of line intensity and line shape. (B) Molecular beam of Cs2 were excited by a crossed tunable laser, and the resulting molecular fluorescence and emission from the dissocited atoms are measured separately as a function of the laser frequency. We found the dependence of the predissociation probability on the vibrational and rotational levels. (C) An accurate potential curve up to the dissociation limit of the B^1II state of Nak were determined, and the predissociation due to the Feschbach resonance were found. (D) Quantum beats of Na(^2P_<3/2>) and quantum beats from collisionally energy transferred state Na(^2P_<1/2>) were observed, and the conservation of the coherence through the collisional energy transfer was proved. (E) Magnetic predissociation and the effects of an external magnetic field on the perturbation was studied in detail.

我们开发了几种无多普勒高分辨率光谱技术：（1）无多普勒调制饱和荧光光谱，（2）无多普勒偏振饱和吸收光谱，（3）分子束交叉激光发射选择性激发光谱，（4）双色光学-光学双共振调制偏振光谱。 得出以下结果。 (A) 基于能量转移、线强度和线形状的变化来研究两个电子态之间的扰动。 (B) Cs2 分子束由交叉可调谐激光器激发，并分别测量所产生的分子荧光和解离原子的发射，作为激光频率的函数。我们发现预解离概率对振动和旋转水平的依赖性。 (C) 确定了直至 Nak B^1II 态解离极限的准确电位曲线，并发现了由 Feschbach 共振引起的预解离。 (D) 观察到Na(^2P_<3/2>)的量子拍和碰撞能量转移态Na(^2P_<1/2>)的量子拍，并证明了碰撞能量转移引起的相干性守恒。 (E) 详细研究了磁预解离和外部磁场对扰动的影响。

项目成果

K. Yokoyama, M. Baba, and H. Kato: "A study on the D^1SIGMA^+_u - X^1SIGMA^+_g band system of Cs_2." J. Chem. Phys. 89, 1209-1214 (1988).

K. Yokoyama、M. Baba 和 H. Kato：“关于 Cs_2 的 D^1SIGMA^ _u - X^1SIGMA^ _g 能带系统的研究。”

M. Baba, T. Nakabori, T. Iida, and H. Kato: "Predissociation of the Cs_2 C^1PI_u state." J. Chem. Phys. (1990).

M. Baba、T. Nakabori、T. Iida 和 H. Kato：“Cs_2 C^1PI_u 状态的预解离”。

H. Kato, M. Otani, and M. Baba: "Perturbation and the effects on the transition intensity and the line shape studied on Alkali metal diatomic molecules." Acta. Physica Hungarica 67, 1-17 (1990).

H. Kato、M. Otani 和 M. Baba：“碱金属双原子分子的扰动及其对跃迁强度和线形的影响。”

横山和重: Journal of Chemical Physics.

横山一茂：化学物理学杂志。

Toshiko KATO: "Raman band shapes and the dynamics of liquifd N_2O_4." Molecular Physics. 66. 1183-1191 (1989)

加藤俊子：“拉曼带形状和液态 N_2O_4 的动力学。”