Evidence of anharmonicity in the vibrational spectrum of protonated ethylene

Evidence of anharmonicity in the vibrational spectrum of protonated ethylene
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质子化乙烯振动谱非谐性的证据

DOI:
10.1016/j.jms.2022.111704
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发表时间:
2022
影响因子:
1.4
通讯作者:
Duncan, Michael A.
Duncan, Michael A.
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
McCoy, Anne B.;Duncan, Michael A.

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重新研究了质子化乙烯H+(C2 H4)在2000 ~ 3500 cm− 1区域的振动光谱。该光谱是通过振动激发后的H+(C2 H4)Ar 2复合物的预解离而获得的,这导致了氩原子的消除。该阳离子的平衡结构在桥位置具有过量质子,在桥位置处,其在CH+ C平面中经历大幅度运动。这些大振幅振动运动导致光谱中的特征不能被分配给谐波处理预测的Δ v= 1跃迁。探讨了导致这些高阶跃迁的非谐性的起源。基于振动微扰理论和降维计算,过渡到两个量子的HCH弯曲振动和一个量子的激发在两个振动的桥质子在CH+ C平面的状态被发现进行显着的强度在该区域的光谱。
The vibrational spectrum of protonated ethylene, H+(C 2 H 4), in the 2000 to 3500 cm− 1 region is re-investigated. The spectrum is obtained by predissociation of the H+(C 2 H 4) Ar 2 complex following vibrational excitation, which leads to elimination of an argon atom. The equilibrium structure of this cation has the excess proton in a bridged position, where it undergoes large amplitude motions in the CH+ C plane. These large amplitude vibrational motions result in features in the spectrum that cannot be assigned to Δ v= 1 transitions predicted by harmonic treatments. The origins of the anharmonicities that lead to these higher order transitions are explored. Based on vibrational perturbation theory and reduced dimensional calculations, transitions to states with two quanta in the HCH bending vibrations and the state with one quantum of excitation in the two vibrations of the bridging proton in the CH+ C plane are found to carry significant intensity in this region of the spectrum.
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