The photodissociation of CH3SCH3 and CD3SCD3 at 220–231 nm investigated by velocity map ion imaging
The photodissociation of CH3SCH3 and CD3SCD3 at 220–231 nm investigated by velocity map ion imaging
复制标题
通过速度图离子成像研究 CH3SCH3 和 CD3SCD3 在 220–231 nm 处的光解离
DOI：
10.1063/1.1346644
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发表时间：
2001
影响因子：
4.4
通讯作者：
T. Kitsopoulos
中科院分区：
文献类型：
--
作者：
B. Martínez;P. Quintana;L. Bañares;P. C. Samartzis;D. Smith;T. Kitsopoulos
采用速度图离子成像技术研究了二甲基硫醚的两种同位素CH_3SCH_3和CD_3SCD_3通过波长为220-231 nm的第一电子吸收带的光解离过程。平移能和反冲角分布已被确定为CH 3和CD 3片段无论是在振动基态或没有产品状态选择。测量结果表明，S-C键的光解产生强烈的各向异性的产物散射分布，其特征在于β参数在（-0.4，-1.0）范围内。对于振动基态产生的甲基碎片，观察到最接近极限值-1.0（对应于偶极垂直跃迁）的β值。产物反冲能量分布集中在1.5-1.7 eV（即，65%-75%的可用能量）和相当窄（半峰全宽，FWHM为0.3-0.5 eV），这表明甲基和甲硫基片段出生在...
The photodissociation of the two isotopomers of dimethyl sulfide, CH3SCH3 and CD3SCD3, through the first electronic absorption band at wavelengths 220–231 nm has been studied employing velocity map ion imaging to detect the methyl products. Translational energy and recoil angle distributions have been determined for the CH3 and CD3 fragments either in the vibrational ground state or without product state selection. The measurements indicate that the S–C bond photolysis yields strongly anisotropic product scattering distributions characterized by β parameters within the range (−0.4, −1.0). The β values closest to the limiting value of −1.0 (corresponding to a dipole perpendicular transition) are observed for the methyl fragments produced in the vibrational ground state. The product recoil energy distributions are centered at ≈1.5–1.7 eV (i.e., 65%–75% of the available energy) and are quite narrow (full width at half maximum, FWHM≈0.3–0.5 eV), which indicates that methyl and methylthio fragments are born in...