The infrared band strengths of CH_3OH, NH_3 and CH_4 in laboratory simulations of astrophysical ice mixtures
The infrared band strengths of CH_3OH, NH_3 and CH_4 in laboratory simulations of astrophysical ice mixtures
复制标题
天体物理冰混合物实验室模拟中CH_3OH、NH_3和CH_4的红外波段强度
DOI：
--
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
P. Ehrenfreund
中科院分区：
文献类型：
--
作者：
O. Kerkhof;W. Schutte;P. Ehrenfreund
地面观测和红外空间天文台（ISO）的观测结果表明，CH_3OH、NH_3和CH_4是星际冰幔的重要组成部分。为了准确计算这些分子的柱密度，在天体物理冰模拟物中对其红外带强度进行良好的测量是很重要的。带强度测量的CH 3OH和CH 4表明，它们只依赖于弱的冰矩阵的组成和温度。另一方面，NH3的伞模式显示出显着减少时，稀释在H2O冰。因此，星际冰中NH3丰度的原始估计值需要向上修正30%。
Results from groundbased observations and the In- frared Space Observatory (ISO) indicate that CH3OH, NH3 and CH4 are important constituents of interstellar ice mantles. In order to accurately calculate the column densities of these molecules, it is important to have good measurements of their in- frared band strength in astrophysical ice analogs. Band strength measurements of CH3OH and CH4 are presented showing that they depend only weakly on the composition of the ice matrix and the temperature. On the other hand, the umbrella mode of NH3 does show a significant decrease when dilluted in H 2O ice. For this reason the original estimates of the abundance of NH3 in interstellar ice need to be revised upward by 30%.