【摘要】 使用速度成像法测得了405 nm飞秒激光脉冲下H⁺的动能分布和角分布。讨论了解离通道H₂⁺→H⁺+H、H₂²⁺→H⁺+H⁺的反应路径,前者产生于经由1ω交叉的直接单光子路径,后者产生于H₂²⁺的库仑爆炸。H₂⁺到H₂²⁺的电离起始于键软化,各通道的相对峰高说明H₂⁺的解离和电离是竞争的。低场强加强H₂⁺的解离,高场强支持H₂⁺的电离。更多还原

【Abstract】 The kinetic energy and angular distributions of H+ as a function of 405 nm femtosecond laser intensity are experimentally measured by using velocity map imaging technique. The reaction pathways of dissociation channels, H₂⁺→H⁺ + H and H₂²⁺→H⁺ + H⁺, are discussed. The former is due to the direct one-photon pathway via the 1ω crossing, and the latter stems from Coulomb explosion of H₂²⁺. Ionization of H₂⁺ to H₂²⁺ starts from bond softening. The relative yield of fragment peak indicates that dissociation and ionization of H₂⁺ are competitive. The lower laser intensity emphasizes the dissociation of H₂⁺, and the higher laser intensity favors the ionization of H₂⁺.更多还原