利用梯度近似对二芳烯基分子开关计算的共振拉曼光谱进行基准测试。

IF 2.8 2区 化学 Q3 CHEMISTRY, PHYSICAL
Emmaline R Lorenzo, Christopher G Elles
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引用次数: 0

摘要

共振拉曼光谱为光激发后分子的初始核运动提供了重要的见解。光谱中的振动频率代表了基态结构,而拉曼带的强度反映了激发到电子激发态后的动力学。为了正确识别激发态动力学,通常需要计算来分配实验谱中的振动,但是当使用不包括共振增强效应的计算时,存在分配错误的风险。非共振计算通常给出在10-20 cm-1范围内的精确频率,但可能不能正确表示实验共振拉曼光谱的相对拉曼散射强度。在拉曼光谱中包含共振增强效应的两种方法是Franck-Condon方法和梯度近似方法。这一贡献检查了两种方法获得共振拉曼强度的二乙烯基分子开关与129正常模式。通过比较在共振和非共振状态下测量的实验光谱与使用非共振、frank - condon和梯度近似方法模拟的光谱,我们强调需要在计算中考虑共振增强效应,以便进行准确的模式分配。梯度近似与实验共振拉曼谱吻合较好,同时避免了寻找激发态优化几何和法向模的复杂性和计算成本。振动赋值揭示了分子开关初始激发态动力学中涉及的关键拉伸运动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Benchmarking the Calculated Resonance Raman Spectrum of a Diarylethene-Based Molecular Switch Using the Gradient Approximation.

Resonance Raman spectroscopy provides important insight into the initial nuclear motions of a molecule following optical excitation. The vibrational frequencies in the spectrum represent the ground-state structure, but the intensities of the Raman bands reflect the dynamics after excitation to an electronically excited state. Calculations are often necessary to assign vibrations in the experimental spectrum in order to correctly identify the excited-state dynamics, but there is a risk of misassignment when using calculations that do not include resonance-enhancement effects. Off-resonance calculations typically give frequencies that are accurate within 10-20 cm-1 but may not correctly represent the relative Raman scattering intensities of an experimental resonance Raman spectrum. Two approaches for including resonance-enhancement effects in the Raman spectrum are the Franck-Condon method and the gradient approximation method. This contribution examines both methods for obtaining resonance Raman intensities for a diarylethene-based molecular switch with 129 normal modes. Comparing experimental spectra measured both on- and off-resonance with simulated spectra using off-resonance, Franck-Condon, and gradient approximation methods highlights the need to include resonance-enhancement effects in the calculations in order to make accurate mode assignments. The gradient approximation gives good agreement with the experimental resonance Raman spectrum while avoiding potential complications and the computational cost of finding the optimized geometry and normal modes of the excited state. The vibrational assignments reveal key stretching motions involved in the initial excited-state dynamics of the molecular switch.

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来源期刊
The Journal of Physical Chemistry A
The Journal of Physical Chemistry A 化学-物理:原子、分子和化学物理
CiteScore
5.20
自引率
10.30%
发文量
922
审稿时长
1.3 months
期刊介绍: The Journal of Physical Chemistry A is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.
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