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首页> 外文期刊>The Journal of Chemical Physics >Dynamics of electron attachment and photodissociation in iodide-uracil-water clusters via time-resolved photoelectron imaging
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Dynamics of electron attachment and photodissociation in iodide-uracil-water clusters via time-resolved photoelectron imaging

机译：通过时间分辨光电子成像的碘化物 - 尿嘧啶 - 水簇中电子附着和光度脱模的动态

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摘要

The dynamics of low energy electron attachment to monohydrated uracil are investigated using time-resolved photoelectron imaging to excite and probe iodide-uracil-water (I-center dot U center dot H2O) clusters. Upon photoexcitation of I-center dot U center dot H2O at 4.38 eV, near the measured cluster vertical detachment energy of 4.40 eV +/- 0.05 eV, formation of both the dipole bound (DB) anion and valence bound (VB) anion of I-center dot U center dot H2O is observed and characterized using a probe photon energy of 1.58 eV. The measured binding energies for both anions are larger than those of the non-hydrated iodide-uracil (I-center dot U) counterparts, indicating that the presence of water stabilizes the transient negative ions. The VB anion exhibits a somewhat delayed 400 fs rise when compared to I-center dot U, suggesting that partial conversion of the DB anion to form the VB anion at early times is promoted by the water molecule. At a higher probe photon energy, 3.14 eV, I- re-formation is measured to be the major photodissociation channel. This product exhibits a bi-exponential rise; it is likely that the fast component arises from DB anion decay by internal conversion to the anion ground state followed by dissociation to I-, and the slow component arises from internal conversion of the VB anion. Published by AIP Publishing.
机译：利用时间分辨的光电子成像对Excite和探针碘化物 - 尿嘧啶 - 尿嘧啶（I中心点U中心点H2O）簇进行了低能量电子连接到一水尿嘧啶的动态。在4.38eV的I-Center Dot U Center Dot H2O的光孔后，近测定的簇垂直分离能为4.40eV +/- 0.05eV，形成偶极子（DB）阴离子（DB）阴离子和价绑定（VB）阴离子的阴离子 - 使用1.58eV的探针光子能量观察和表征Center Dot U中心点H2O。两个阴离子的测量结合能大于非水合碘-URACIL（I中心点U）对应物的结合能量，表明水的存在稳定瞬态阴离子。与I中心点U相比，VB阴离子表现出稍微延迟的400fs上升，表明DB阴离子在早期将VB阴离子形成VB阴离子的部分转化被水分子促进。在更高的探针光子能量下，3.14eV，测量I-重新形成为主要的光度光度分离通道。该产品展示了双指数升高;快速部件可能从DB阴离子衰变产生通过内部转换为阴离子地面状态，然后解离I-，并且慢组分从VB阴离子的内部转换产生。通过AIP发布发布。

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