Laser-induced fluorescence of free diamondoid molecules.
Laser-induced fluorescence of free diamondoid molecules.
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DOI：
10.1039/c4cp04423a
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发表时间：
2015-01
期刊：
影响因子：
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通讯作者：
R. Richter;M. Röhr;T. Zimmermann;J. Petersen;C. Heidrich;R. Rahner;T. Möller;J. Dahl;R. Carlson;R. Mitrić;T. Rander;A. Merli
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文献类型：
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作者：
R. Richter;M. Röhr;T. Zimmermann;J. Petersen;C. Heidrich;R. Rahner;T. Möller;J. Dahl;R. Carlson;R. Mitrić;T. Rander;A. Merli
我们观察到的荧光的原始金刚石在气相中，激发使用窄带紫外激光。发射光谱显示出明确的功能，这可以归因于从激发电子态到电子基态的不同振动模式的过渡。我们分配负责的振动带的正常模式，并确定激发态的几何形状。计算表明，对于大金刚石，光谱带不是由单模的级数，而是由大量的Δv = 1跃迁组成的组合带。决定光谱包络的振动模式主要是表面原子的摇摆和扭曲模式。我们的结论是，我们的理论方法准确地描述了在金刚石和可能的其他碳氢化合物一般的非线性物理。
We observe the fluorescence of pristine diamondoids in the gas phase, excited using narrow band ultraviolet laser light. The emission spectra show well-defined features, which can be attributed to transitions from the excited electronic state into different vibrational modes of the electronic ground state. We assign the normal modes responsible for the vibrational bands, and determine the geometry of the excited states. Calculations indicate that for large diamondoids, the spectral bands do not result from progressions of single modes, but rather from combination bands composed of a large number of Δv = 1 transitions. The vibrational modes determining the spectral envelope can mainly be assigned to wagging and twisting modes of the surface atoms. We conclude that our theoretical approach accurately describes the photophysics in diamondoids and possibly other hydrocarbons in general.