Photofragmentation of mass‐selected (C6H6)+n clusters: Measurement of monomer–cluster binding energy for n=7–15
Photofragmentation of mass‐selected (C6H6)+n clusters: Measurement of monomer–cluster binding energy for n=7–15
复制标题
质量选择的 (C6H6)+n 团簇的光断裂：测量 n=7–15 的单体-团簇结合能
DOI：
10.1063/1.462099
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发表时间：
1992
影响因子：
4.4
通讯作者：
J. Hecht
中科院分区：
文献类型：
--
作者：
S. Beck;J. Hecht
通过质量选择光碎裂光谱研究了通过激光诱导等离子体形成在超音速喷嘴的喉部产生的大小高达 15 个分子单元的苯簇阳离子。所有簇都表现出强而宽的吸收，至少从 690 nm 延伸到 1064 nm，中心位于 900 nm 附近。该吸收归因于在二聚体离子的固态光谱中观察到的基于二聚体的间隔跃迁。对该带的激发会导致中性苯分子从簇离子中迅速喷射出来。在低碎裂激光强度下，观察到单个子离子种类。我们观察到喷射的中性分子数量对碎裂激光波长的简单依赖性，强烈表明中性苯分子的连续蒸发过程。对于大于 6 的团簇，平均键能范围为 0.37-0.34 eV/分子，非常接近液态苯的汽化热。发现 14 个分子簇具有阳极...
Benzene cluster cations up to 15 molecular units in size, produced in the throat of a supersonic nozzle by laser‐induced plasma formation, are studied by mass‐selected photofragmentation spectroscopy. All of the clusters exhibit a strong, broad absorption which extends at least from 690 to 1064 nm, centered near 900 nm. This absorption is assigned to the dimer based intervalence transition observed in solid state spectra of the dimer ions. Excitation into this band produces prompt ejection of neutral benzene molecules from the cluster ion. At low fragmentation laser intensities, a single daughter ion species is observed. We observe a simple dependence of the number of neutral molecules ejected on the fragmentation laser wavelength, strongly suggesting a sequential evaporation process of neutral benzene molecules. For clusters larger than six, an average bond energy ranges from 0.37–0.34 eV/molecule, quite close to the heat of vaporization for liquid benzene. The 14 molecule cluster is found to have an ano...