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姓名 卓筠庭(Yun-Ting Cho) 查詢紙本館藏 畢業系所 物理學系 論文名稱
(Temperature dependent photodesorption of CO ices)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 真空紫外光子引發冰晶分子的非熱脱附效應，可以用來解釋冷星雲與星際間觀測到大量的氣態一氧化碳分子的成因。文獻的研究結果顯示，光脫附量會隨著一氧化碳冰晶長冰時的溫度升高而降低。Dr. Muñoz Caro 等人 (2016) 曾嘗試將冰晶結構及自建性電場用來解釋光脫附效率的改變，然而其結果卻顯示應當還有其他的物理特徵會影響冰晶分子光脫附量隨長冰溫度變化的情況。真空紫外光子引發冰晶分子的脫附現象常使用電子躍遷所引發的脫附行為來解釋，其過程由激發態分子傳遞能量給冰晶表層的分子造成脫附。然而此模型並沒有詳細描述能量如何在冰晶分子中傳遞。本論文試著引進冰晶分子光吸收截面與隨長冰溫度變化之能量傳遞振幅與能量傳遞距離，說明一氧化碳冰晶分子之光脫附量是如何受到長冰溫度的影響。 摘要(英) Vacuum ultraviolet (VUV) photon induced non-thermal desorption of solid phase molecules has been applied to explain the massive amount of gas phase CO in cold dense clouds and in the interstellar region. According to previous studies, the photodesorption yield decreases with higher deposition temperatures. Muñoz Caro et al. (2016) tried to explain the change in the photodesorption yield by the structure and spontelectric field of CO ices. However, their results indicate that there are also other physical properties that affect the variation of the photodesorption yield with the deposition temperature. VUV induced photodesorption of CO ices is described as due to desorption induced by electronic transition, which is desorption caused by the transfer of energy from excited molecules to surface molecules. However, the model does not contain a detailed description of how energy transfer in CO ices occurs. In this work, we introduce an absorption cross section of CO ices, and examine how the energy amplitude and energy transfer depth vary as a function of the deposition temperature, to explain the effect of the deposition temperature on the photodesorption yield of CO ices. 關鍵字(中) ★ 一氧化碳
★ 星際冰晶
★ 光脫附
★ 真空紫外光照射
★ 能量傳遞關鍵字(英) ★ Carbon monoxide
★ Interstellar ice
★ Photodesorption
★ VUV irradiation
★ Energy transfer論文目次 中文摘要 iv
Abstract v
致謝 vi
List of Figures viii
List of Tables x
Chapter 1. Introduction 1
Chapter 2. Experimental method 3
2.1 Experimental setup 3
2.2 Experimental procedure 4
Chapter 3. Results and discussion 7
3.1 Derivation of the average photodesorption yield for CO ice 7
3.2 Temperature effect on photodesorption yield 12
3.2.1 Photodesorption yield as a function of deposition temperature 12
3.2.2. Instantaneous photodesorption yield as a function of remaining CO thickness 15
3.3 Effect of thickness on the photodesorption yield 16
3.4 Mechanism of photodesorption 18
3.4.1 The effects of energy transfer amplitude and energy transfer depth on the photodesorption yield of CO ice 22
3.4.2 Temperature gradient effects on the photodesorption yield 27
3.5 Effective surface area 29
Chapter 4. Conclusions 32
References 33參考文獻 [1] Öberg, K. I., Fuchs, G. W., Awad, Z., et al., Photodesorption of CO ice. The Astrophysical Journal Letters, 2007, 662, L23
[2] Muñoz Caro, G. M., Jiménez-Escobar, A., Martín-Gago, J. Á., et al., New results on thermal and photodesorption of CO ice using the novel InterStellar Astrochemistry Chamber (ISAC). Astronomy & Astrophysics, 2010, 522, A108
[3] Chen, Y. J., Chuang, K. J., Muñoz Caro, G. M., et al., Vacuum Ultraviolet Emission Spectrum Measurement of a Microwave-Discharge Hydrogen-Flow Lamp in Several Configurations: Application to Photodesorption of CO Ice. The Astrophysical Journal, 2014, 781, 15
[4] Fayolle, E. C., Bertin, M., Romanzin, C., et al., CO ice photodesorption: a wavelength-dependent study. The Astrophysical Journal Letters, 2011, 739, L36
[5] Bertin, M., Fayolle, E. C., Romanzin, C., et al., UV photodesorption of interstellar CO ice analogues: from subsurface excitation to surface desorption. Physical Chemistry Chemical Physics, 2012, 14, 9929
[6] Öberg, K. I., Van Dishoeck, E. F., Linnartz, H., et al., Photodesorption of ices I: CO, N2 and CO2. Astronomy & Astrophysics, 2009, 496, 281
[7] Caro, G. M., Chen, Y.-J., Aparicio, S., et al., Photodesorption and physical properties of CO ice as a function of temperature. 2016, 589, A19
[8] 吳尚叡, CO2 冰晶光脫附之溫度效應研究. 中央大學物理學系學位論文, 2014
[9] Jiang, G. J., Person, W. B., and Brown, K. G., Absolute infrared intensities and band shapes in pure solid CO and CO in some solid matrices. The Journal of Chemical Physics, 1975, 62, 1201
[10] Loeffler, M. J., Baratta, G. A., Palumbo, M. E., et al., CO synthesis in solid CO by Lyman-α photons and 200 keV protons. Astronomy & Astrophysics, 2005, 435, 587
[11] Sie, N. E., Muñoz Caro, G. M., Huang, Z. H., et al., On the Photodesorption of CO2 Ice Analogs: The Formation of Atomic C in the Ice and the Effect of the VUV Emission Spectrum. The Astrophysical Journal, 2019, 874, 35
[12] Madey, T. E., History of desorption induced by electronic transitions. Surface science, 1994, 299, 824
[13] Cruz-Diaz, G. A., Muñoz Caro, G. M., Chen, Y. J., et al., Vacuum-UV spectroscopy of interstellar ice analogs-I. Absorption cross-sections of polar-ice molecules. Astronomy & Astrophysics, 2014, 562, A119
[14] Lasne, J., Rosu-Finsen, A., Cassidy, A., et al., Spontaneous electric fields in solid carbon monoxide. Physical Chemistry Chemical Physics, 2015, 17, 30177
[15] Kouchi, A., Yamamoto, T., Kozasa, T., et al., Conditions for condensation and preservation of amorphous ice and crystallinity of astrophysical ices. Astronomy and Astrophysics, 1994, 290, 1009
[16] He, J., Clements, A. R., Emtiaz, S. M., et al., The effective surface area of amorphous solid water measured by the infrared absorption of carbon monoxide. The Astrophysical Journal, 2019, 878, 94指導教授 陳俞融 審核日期 2019-7-31 推文 plurk
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