| Summary: | 碩士 === 國立中央大學 === 物理學系 === 107 === 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.
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