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Electronic transitions induced by simultaneous absorption of synchrotron radiation and laser

同时吸收同步辐射和激光引起的电子跃迁

基本信息

批准号：
10640504
负责人：
MITSUKE Koichiro
金额：
$ 1.98万
依托单位：
Okazaki National Research Institutes
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

1. A synchrotron radiation-laser combination technique developed at UVSOR in Okazaki was employed for probing ionic photofragments produced in the vacuum ultraviolet. N^2_+(X^2Σ^g_+, vx=0 and 1) resulting from direct ionization or autoionization of N_2 or N_2O was detected by laser induced fluorescence excitation spectroscopy in the wavelength region of the B^2Σ^u_+←X^2Σ^g_+ transition. The rotational distribution of N^2_+ is determined by the change in the rotational quantum number in photoionization and by the partitioning of the excess energy impulsively released in dissociation.2. A similar combination technique was employed to observe CN radicals produced from CH_3CN.The laser induced fluorescence signal was measured as a function of the photon energy ranging from 13.6 to 18.6 eV with the laser wavelength for the CN(B^2Σ^+, vb=0←X^2Σ^+, v^x=0) transition. The onset of 15.4 eV of the fluorescence signal indicates that the CN(X^2Σ^+)radicals result from dissociative ionization of CH_3CN.3. Photofragmentation of OCS in the excitation photon energy range of 15-30eV was studied by dispersed fluorescence spectroscopy using synchrotron dadiation. The following emission band systems were identified : OCS^+_Ω[A^2II_Ω (0, 0, 0)→X^2II (0, 0, v_3")], CO^+(A^2II X^2II), CS^+(B^2Z^+ A^2II ) and Co(d^3 a^3II). All the transitions of S[nd^3D^o 4p^3→P_e(n=6-9)]which result from neutral dissociation of superexcited Rydberg states of OCS into S(nd^3D^o)+CO.

1. 利用冈崎UVSOR开发的同步辐射-激光组合技术探测真空紫外线下产生的离子光碎片。在B^2Σ^u_+←X^2Σ^g_+跃迁的波长区，用激光诱导荧光激发光谱检测了N_2或N_2O直接电离或自电离产生的N^2_+（X^2Σ^g_+, vx=0和1）。N^2_+的旋转分布由光离过程中转动量子数的变化和离解过程中脉冲释放的多余能量的分配决定。用类似的组合技术观察了CH_3CN产生的CN自由基。激光诱导荧光信号是光子能量在13.6 ~ 18.6 eV范围内的函数，激光波长为CN（B^2Σ^+, vb=0←X^2Σ^+, v^ X =0）跃迁。荧光信号的起始值为15.4 eV，表明CN（X^2Σ^+）自由基是由CH_3CN.3的解离电离产生的。利用同步辐射分散荧光光谱技术研究了OCS在激发光子能量15 ~ 30ev范围内的光破碎现象。确定了OCS^+_Ω[A^2II_Ω（0,0,0）→X^2II （0,0, v_3”）]、CO^+(A^2II X^2II)、CS^+(B^2Z^+ A^2II)和CO （d^ 3a ^3II）。所有由OCS超激发态中性解离成S(and ^3D^o)+CO的S[and ^3D^o 4p^3→P_e(n=6-9)]跃迁。