;In the low-temperature environment of dense molecular clouds, most molecules condense onto dust grains, forming interstellar ices. These Interstellar ices can undergo non-thermal desorption or chemical reactions when exposed to various energetic sources Nitrogen oxides are considered to be one of the precursor substances for the formation of amino acids. However, although over 200 different gaseous molecules have been detected in the cosmos, only six of them are nitrogen oxides, including dinitrogen monoxide (N2O). Yet, scientists have not detected dinitrogen monoxide molecules in interstellar ice, making the depletion mechanism of N2O ice an intriguing research topic. The primary objective of this study is to observe the depletion cross-section of N2O ice subjected to VUV irradiation and investigate the influence of ice formation temperature on them. The results reveal that the depletion cross-section of N2O ice is influenced by both the photo-products and the ice formation temperature. The depletion cross-section increases as the VUV photon fluence increases, and it becomes smaller at higher ice formation temperatures. As the photon fluence increases, the photo-products produce another chemical reaction pathway and lead to the depletion cross-section increases. And the temperature effect is believed to be due to the influence of the ice formation temperature on the alignment of dipole moments, resulting in changes in intermolecular binding energy, leading to smaller depletion cross-sections in N2O ice formed at higher temperatures.
