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Effects of Deposition Temperature on Phase Transition of Amorphous Ice
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2024-04-30 , DOI: 10.1021/acs.jpcc.4c01617 Kentaro Kina 1 , Yui Ono 1 , Daiki Yoshida 1 , Tomoko Ikeda-Fukazawa 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2024-04-30 , DOI: 10.1021/acs.jpcc.4c01617 Kentaro Kina 1 , Yui Ono 1 , Daiki Yoshida 1 , Tomoko Ikeda-Fukazawa 1
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To investigate the effects of deposition temperature, Td, on the phase transition of amorphous ice with heating, the infrared spectra of ice deposited at temperatures of 6–160 K were measured. From the changing rate of the wavenumber of the O–H symmetric stretching mode with heating, the transition processes from high-density amorphous (HDA) ice to crystalline hexagonal ice Ih via low-density amorphous (LDA) ice and ice Ic were analyzed. The results show that the structure of the deposited ice depends on Td and is classified into six types: (i) HDA ice at Td < 20 K, (ii) a mixture of HDA and LDA ice at 20 K < Td < 80 K, (iii) LDA ice at 80 K < Td < 130 K, (iv) a mixture of LDA ice and Ic at 130 K < Td < 140 K, (v) Ic at 140 K < Td < 150 K, and (vi) a mixture of Ic and Ih at Td > ∼150 K. Furthermore, the processes of the structural transitions from the deposited ice with heating reflect Td. These results have important implications for the chemical evolution processes in interstellar molecular clouds.
中文翻译：
沉积温度对非晶冰相变的影响
为了研究沉积温度T d对加热过程中非晶冰相变的影响，测量了在 6-160 K 温度下沉积的冰的红外光谱。从O-H对称伸缩模波数随加热的变化率，可以看出从高密度非晶态(HDA)冰经低密度非晶态(LDA)冰和冰I c向结晶六方冰I h的转变过程分析了。结果表明，沉积冰的结构取决于T d并分为六种类型：（i）T d < 20 K 时的 HDA 冰，（ii）20 K < T d <时 HDA 和 LDA 冰的混合物80 K，(iii) 80 K < T d < 130 K 时的 LDA 冰，(iv) 130 K < T d < 140 K 时的 LDA 冰和I c的混合物，(v) 140 K < T d时的I c < 150 K，以及 (vi) I c和I h的混合物，T d > ∼150 K。此外，加热时沉积的冰的结构转变过程反映了T d。这些结果对星际分子云的化学演化过程具有重要意义。
更新日期：2024-04-30
中文翻译：
沉积温度对非晶冰相变的影响
为了研究沉积温度T d对加热过程中非晶冰相变的影响，测量了在 6-160 K 温度下沉积的冰的红外光谱。从O-H对称伸缩模波数随加热的变化率，可以看出从高密度非晶态(HDA)冰经低密度非晶态(LDA)冰和冰I c向结晶六方冰I h的转变过程分析了。结果表明，沉积冰的结构取决于T d并分为六种类型：（i）T d < 20 K 时的 HDA 冰，（ii）20 K < T d <时 HDA 和 LDA 冰的混合物80 K，(iii) 80 K < T d < 130 K 时的 LDA 冰，(iv) 130 K < T d < 140 K 时的 LDA 冰和I c的混合物，(v) 140 K < T d时的I c < 150 K，以及 (vi) I c和I h的混合物，T d > ∼150 K。此外，加热时沉积的冰的结构转变过程反映了T d。这些结果对星际分子云的化学演化过程具有重要意义。
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