A theoretical and experimental study on translational and internal energies of H_2O and OH from the 157 nm irradiation of amorphous solid water at 90 K
A theoretical and experimental study on translational and internal energies of H_2O and OH from the 157 nm irradiation of amorphous solid water at 90 K
复制标题
90 K非晶固体水157 nm照射下H_2O和OH的平移能和内能的理论与实验研究
DOI：
10.1039/c1cp21138b
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. N. Ashfold
中科院分区：
文献类型：
--
作者：
S. Andersson;C. Arasa;A. Yabushita;M. Yokoyama;T. Hama;M. Kawasaki;C. M. Western;M. N. Ashfold
光解吸的H2O在其振动的基态，OH自由基在其地面和第一激发振动状态，以下157 nm的光激发的无定形固体水已经研究了使用分子动力学模拟和实验检测的共振增强多光子电离技术。有很好的协议之间的模拟和测量的能量分布。此外，在实验中检测到H+和OH+的信号。这些被推断为源自振动激发的H2O分子，从表面喷出的两种不同的机制：直接解吸机制和解吸诱导的二次重组的光产物在冰表面。这是首次报道的振动激发水分子从水冰中光脱附的实验证据。
The photodesorption of H2O in its vibrational ground state, and of OH radicals in their ground and first excited vibrational states, following 157 nm photoexcitation of amorphous solid water has been studied using molecular dynamics simulations and detected experimentally by resonance-enhanced multiphoton ionization techniques. There is good agreement between the simulated and measured energy distributions. In addition, signals of H+ and OH+ were detected in the experiments. These are inferred to originate from vibrationally excited H2O molecules that are ejected from the surface by two distinct mechanisms: a direct desorption mechanism and desorption induced by secondary recombination of photoproducts at the ice surface. This is the first reported experimental evidence of photodesorption of vibrationally excited H2O molecules from water ice.