本計畫延續前幾年的研究工作，將進一步探討類海王星外星體大氣冰晶和星際冰晶在同步輻射真空紫外光照射下，有機大分子的生成機制。另一個研究重點將探討硫化物冰晶在生命起源中所扮演之角色，就我們所知羰基硫化物和氨基酸能很快進行化學反應，生成鏈狀肽，鏈狀肽進一步相互交織可形成蛋白質。此外並對類海王星體與硫化物冰晶進行不同溫度下的紅外光譜測量，建立天文觀測所須的基本資料庫(部分資料已建立在 http://amslab.zxq.net/?page_id=36)。用來模擬星際冰晶之氣體在超高真空(10-10 torr)與低溫(~18K)的環境中混合凝結在基材上，形成類海王星外星體大氣冰晶和硫化物冰晶。並利用同步輻射研究中心的 High Flux 光束線提供 4~30 eV 的真空紫外光長時間照射冰晶。藉傅氏紅外光譜儀與質譜儀並搭配傳統的分光儀監控有機大分子的形成與脫附情形，再藉由各種實驗條件的搭配與同位素的標定，探討各種分子聚合的進程。另外在回溫到室溫後的殘餘物中，藉液相層析儀的幫助瞭解其中所含的有機大分子成分與產量。嘗試找到監控大分子成因的各種參數並予以瞭解。 This proposal is a continuation of the research work we have been devoting in for last few years. Within next three years, attentions will be focused on the synchrotron radiation photolysis of TNOs ice analogues and interstellar ices. On the other hand, we will also study what role sulfide played in original life. As far as we know, carbonyl sulfide reacts on amino acids to form peptide, then peptide and peptide interaction can form protein. Also, Infrared spectra of TNOs and sulfide containing ice in different temperature conditions will be measured to establish the database for future astronomical observation use (partial data can be download in http://amslab.zxq.net/?page_id=36). Gases which will be used to simulate TNOs and sulfide containing ice analogues will be deposited in-situ on a substrate which is kept in ultra high vacuum (10-10 torr) and low temperature (~18K). The vacuum ultraviolet light source will utilize the synchrotron radiation source to provide 4~30eV photon beam. The formation of large organic molecules and the species desorbed in the photolysis process will be monitored by a Fourier transformed IR spectrometer and mass spectrometer, respectively. The involved chemical processes will be analyzed through various selected initial conditions and experimentally controlled parameters as well incorporating all sorts of isotopes with the labeled experiments to further our understanding on the photolysis mechanism. The residue left over on the substrate after the sample was brought back to room temperature will be analyzed by a high performance liquid chromatograph to find the species and their abundance of large organic molecules. 研究期間：9908 ~ 10007
