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Electronic Structure and Excited State Dynamics of Carbon-chain free radicals

碳链自由基的电子结构和激发态动力学

基本信息

批准号：
09440194
负责人：
ENDO Yasuki
金额：
$ 8.77万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Carbon-chain free radicals such as CィイD24ィエD2H and CィイD23ィエD2N have been extensively investigated by microwave spectroscopy and radio astronomy. However, their electronic structures especially those in excited electronic states and their reaction dynamics have not been understood in detail. This project has intended to reveal details of such carbon-chain free radicals, in particular their excited electronic states and excited state dynamics.We have successfully applied stimulated emission pumping (SEP) spectroscopy to the HCCS radical to understand detailed vibronic structure in the ground electronic state, which is subjected to the Renner-Teller interaction. The present results are expected to be valuable to understand the excited state vibronic structure, which has not analyzed yet although many of vibronic bands have been observed.Visible and near infrared spectra of the CCS radical have been observed for the first time. The species has been known to be an important free radical in interstellar space. We have developed a new scheme of microwave-optical double resonance spectroscopy, which has successfully applied to the study of the CCS radical in the near infrared region.Furthermore, we have observed electronic and pure rotational spectra of a completely unknown new carbon-chain free radical, NCィイD23ィエD2O. Its linearity in the ground electronic state has been discussed based on the observed spectra. We have observed carbon-chain free radicals containing a nitrogen atom, HCィイD24ィエD2N, CHCHCN, and HィイD22ィエD2CィイD23ィエD2N by microwave spectroscopy.

碳链自由基如C γ γ γ γ D24 γ γ γ D2H和C γ γ D23 γ γ D2N已被微波光谱和射电天文学广泛研究。然而，它们的电子结构，特别是激发态的电子结构及其反应动力学尚未得到详细的了解。该项目旨在揭示这些碳链自由基的细节，特别是它们的激发态和激发态动力学。我们成功地将受激发射泵浦（SEP）光谱应用于HCCS自由基，以了解受Renner-Teller相互作用影响的基电子态的详细振动结构。目前的研究结果对理解激发态的振动结构有一定的价值，尽管已经观察到许多振动带，但尚未对激发态的振动结构进行分析。首次观测到CCS自由基的可见和近红外光谱。已知该物种是星际空间中重要的自由基。我们开发了一种新的微波-光学双共振光谱方案，并成功地应用于近红外区CCS自由基的研究。此外，我们还观察到了一种完全未知的新型碳链自由基NC γ γ γ D23 γ γ γ γ D2O的电子和纯旋转光谱。根据观测到的光谱，讨论了其在基电子态的线性。我们用微波光谱法观察到碳链自由基含有一个氮原子，HC γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。