DC 欄位 值 語言 DC.contributor 物理學系 zh_TW DC.creator 李智曜 zh_TW DC.creator Jr-Yau Li en_US dc.date.accessioned 2023-7-25T07:39:07Z dc.date.available 2023-7-25T07:39:07Z dc.date.issued 2023 dc.identifier.uri http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=111222038 dc.contributor.department 物理學系 zh_TW DC.description 國立中央大學 zh_TW DC.description National Central University en_US dc.description.abstract 硫是宇宙中第十豐富的元素，其中H2S是第三豐富的硫物種，僅次於S和HS。此外，H2S被認為是眾多硫分子的重要前導物質，如OCS、CS2、以及SO2分子。在這項研究中，我們通過在CO:H2S混合冰晶照射1 keV的電子，模擬宇宙射線產生的次級電子，研究不同環境對含硫分子的化學衍化影響。我們的結果發現：（一）在較高的CO:H2S比例中，CO和H2S分子具有較低的消耗截面。（二）在實驗中觀察到的主要生成物為CO2、OCS、SO2和CS2分子。其中CO2、OCS和SO2分子的生成速率隨著CO:H2S混合冰晶的比例上升而增加。（三）在所有比例CO:H2S混合冰晶的情況下，消失的硫原子都來自於Sx物種的生成。此外，我們發現CO2和CS2分子的吸收帶對周圍環境（冰晶混合物的組成和其中各分子的相對比例）非常敏感，特別是CO2分子的柱密度，會被紅外吸收特徵的形變及電子激發脫附兩者嚴重影響。 zh_TW dc.description.abstract Sulfide is the tenth most abundant element in the universe. The hydrogen sulfide (H2S) is the third most abundant sulfur species, following sulfur atoms and sulfanyl radicals, and serves as an important precursor for S-bearing molecules such as OCS, CS2, and SO2. In this study, we investigated the effect of environmental conditions on the chemical evolution of S-bearing molecules by irradiating CO:H2S ice mixtures with 1 keV electrons, simulating secondary electrons generated from cosmic rays. Our results revealed the following findings: (I) Higher CO:H2S ice mixture ratios lead to lower depletion cross section of parent molecules (CO and H2S). (II) The major products observed were CO2, OCS, SO2 and CS2. The formation rates of CO2, OCS, and SO2 increased with higher CO:H2S ice mixture ratios. (III) In all cases of CO:H2S ice mixtures, the missing sulfur is attributed to the presence of Sx species. Furthermore, the bands of CO2 and CS2 molecules were found to be sensitive to the surrounding environment (the composition of ice mixtures and the relative proportions of each molecule within them), and the CO2 column density was significantly affected by the interaction between infrared feature distortion and electron stimulated desorption (ESD). en_US DC.subject 星際冰晶 zh_TW DC.subject 硫化氫 zh_TW DC.subject 一氧化碳 zh_TW DC.subject 電子作用 zh_TW DC.subject 紅外光譜 zh_TW DC.subject 質譜儀 zh_TW DC.subject 含硫分子 zh_TW DC.subject interstellar ice en_US DC.subject hydrogen sulfide en_US DC.subject carbon monoxide en_US DC.subject electrons en_US DC.subject infrared spectroscopy en_US DC.subject mass spectroscopy en_US DC.subject S-bearing molecules en_US DC.title Chemical evolution of CO:H2S ice mixture under 1 keV electron irradiation en_US dc.language.iso en_US en_US DC.type 博碩士論文 zh_TW DC.type thesis en_US DC.publisher National Central University en_US