利用光譜分析在層冰中由真空紫外光所誘發的能量傳遞;Spectrally Resolved VUV Photoinduced Energy Transfer in Layered Ices

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题名:	利用光譜分析在層冰中由真空紫外光所誘發的能量傳遞;Spectrally Resolved VUV Photoinduced Energy Transfer in Layered Ices
作者:	黃竣琦;Huang, Chun-Chi
贡献者:	物理學系
关键词:	一氧化碳;真空紫外光照射;光脫附;真空紫外光吸收截面;Carbon monoxide;VUV irradiation;photodesorption;VUV absorption cross section
日期:	2024-08-16
上传时间:	2024-10-09 15:48:59 (UTC+8)
出版者:	國立中央大學
摘要:	在近幾十年來，由真空紫外光引發的CO冰晶的光脫附反應已經被廣泛地研究。Fayolle et al. (2011)展示了CO冰晶的光脫附反應取決於其電子躍遷及振動躍遷的強度，這意味著光脫附反應是由電子躍遷所引發的。此外，通過層冰 (N2/13CO)的實驗，Bertin et al. (2013)指出這機制是間接的，能量可以在兩個具有不同電子躍遷狀態的分子間傳遞。本次研究我們會沉積純13CO冰晶，或將13CO冰晶沉積在Ar、CH4、或CH3OH冰晶上，並利用單色光對其進行照射。透過這些分子在真空紫外光的吸收截面上的差異，去研究不同分子之間能量傳遞的機制。然而我們發現有兩個因素會影響上層13CO冰晶的脫附:有效表面積以及在冰層介面發生的化學反應。此外，透過不同厚度的純13CO冰晶，我們可以找出在不同電子能階下的能量傳遞長度。;The VUV-induced photodesorption of CO has been widely studied over the past few decades. Fayolle et al. (2011) demonstrated that the photodesorption of CO depends on its vibronic and electronic transition strengths, implying that the desorption is induced by the electronic transition (DIET). Furthermore, through a double-layered ice (N2/13CO) experiment, Bertin et al. (2013) suggested that this mechanism is indirect, allowing energy transfer between two different molecules with non-coinciding electronic transition states. In this study, pure 13CO ice and 13CO ice deposited on top of Ar, CH4, or CH3OH ice are irradiated by tunable, monochromatic synchrotron radiation. Through the discrepancy in the VUV-absorption cross section among these molecules, we aim to investigate the mechanism of the energy transfer between different molecules. However, we find that two factors affect the photodesorption yield of top-layered 13CO ice: the effective surface area and chemical reaction at the ice layer interface. Additionally, through experiments with different column densities of pure 13CO ice, we can determine the energy transfer length for each electronic transition.
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