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Infrared spectrum and structural assignment of the water trimer anion

机译:三聚体阴离子的红外光谱和结构分配

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摘要

The bending vibrational spectrum of the perdeutero isotopomer of the water trimer anion has been measured and compared with spectra calculated using the MP2, CCSD, and Becke3LYP electronic structure methods. Due to its low electron binding energy (approximate to 150 meV), only the OD bending region of the IR spectrum of (D2O)(3)(-) is accessible experimentally, with electron ejection dominating at higher photon energies. The calculated spectrum of the isomer having three water molecules arranged in a chain agrees best with the experimental spectrum. In the chain isomer, the excess electron is bound to the terminal water monomer with two dangling OH groups. This is consistent with the electron binding mechanism established previously for the (H2O)(n)(-) (n = 2, 4-6) anions.
机译:测量了水三聚体阴离子的全氘代异位异构体的弯曲振动光谱,并将其与使用MP2,CCSD和Becke3LYP电子结构方法计算出的光谱进行了比较。由于其低的电子结合能(约150 meV),实验上只能进入(D2O)(3)(-)的IR光谱的OD弯曲区域,其中电子喷射在较高的光子能量下占主导地位。具有三个水分子链状排列的异构体的计算光谱与实验光谱最吻合。在链异构体中,过量的电子与带有两个悬挂的OH基的末端水单体结合。这与先前为(H2O)(n)(-)(n = 2,4-6)阴离子建立的电子结合机理一致。

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