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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Electronic absorption and resonance Raman spectra of large linear carbon clusters isolated in solid argon
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Electronic absorption and resonance Raman spectra of large linear carbon clusters isolated in solid argon

机译：固体氩气中分离的大线性碳簇的电子吸收和共振拉曼光谱

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Neutral and anionic carbon clusters have been generated via a laser-induced graphite-based plasma and deposited in a solid argon matrix. Anionic clusters were formed from neutral clusters by using crossed electron/carbon cluster beams. Thermal annealing (to 36 K) resulted in the aggregation of the smaller carbon species, leading to the formation of long chain neutral and anionic clusters. Spectroscopic measurements in the ultraviolet, visible, near-infrared and infrared regions revealed a series of bands attributable to a homologous set of odd-numbered C-5-C-29 neutral clusters and even-numbered C-6(-)-C-36(-) anionic clusters. Good agreement is found for the band positions of carbon chains containing odd C-15-C-21 neutrals and even C-6(-)-C-22(-) anions, with species previously identified by Maier and coworkers using mass selection or laser vaporization, followed by neon matrix isolation. Resonance Raman frequencies for the neutral C-17, C-21 and C-23 species are shown to be consistent with the above attributions. Density functional theory calculations agree well with the observed bands. It is found that certain low frequency Raman stretching frequencies decrease in a predictable way with increasing chain length. Comparison of the 0(0)(0) absorption transitions of the even C-6(-)-C-6(-) anionic clusters with the 'unidentified' infrared (UIR) interstellar emission bands suggests that the electronic emission from specific long chain carbon anions may contribute to the some of the UIR bands. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 47]
机译：中性和阴离子碳簇已经通过激光诱导的石墨基等离子体产生，并沉积在固体氩气基质中。通过使用交叉的电子/碳簇束束，由中性簇形成阴离子簇。热退火（至36 K）导致较小碳物种的聚集，导致长链中性和阴离子簇的形成。在紫外线，可见光，近红外和红外区域的光谱测量结果显示，一系列谱带可归因于一组奇数的C-5-C-29中性簇和偶数的C-6（-）-C- 36（-）阴离子簇。对于包含奇数C-15-C-21中性离子甚至C-6（-）-C-22（-）阴离子的碳链的能带位置，人们已经发现了很好的一致性，这与Maier和同事先前通过质量选择或激光汽化，然后分离氖基。中性C-17，C-21和C-23物种的共振拉曼频率显示与上述属性一致。密度泛函理论计算与观察到的谱带非常吻合。发现某些低频拉曼拉伸频率以可预测的方式随着链长的增加而降低。偶数C-6（-）-C-6（-）阴离子簇与“未识别的”红外（UIR）星际发射带的0（0）（0）吸收跃迁的比较表明，特定长距离的电子发射链碳阴离子可能有助于某些UIR谱带。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：47]

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