混合H2O：CO冰中的条带特征和条带强度
Band profiles and band strengths in mixed H2O:CO ices
摘要：
一个实验室研究的波段配置文件和波段强度的H2O在CO冰，反之亦然，提出和解释的两个模型。结果表明，固体中的两种物质之间发生相互作用，改变了能带的位置和强度。结果表明，CO浓度从0增加到80%时，H2O的体伸缩、弯曲和振动振动带的带强线性下降，最多下降2倍。相比之下，自由OH伸缩的带强度线性增加。最近进行的定量研究H2O：CO2冰混合物的结果进行了比较。结果表明，对于1：0.5 H2O：X和更高的混合比，H2O弯曲模式提供了一个很好的示踪剂，以区分CO2或CO在H2O冰。此外，它被发现的CO基波的频带强度保持不变时，水的浓度增加的冰。2152 cm-1 CO特征的积分吸收率，相对于总的积分CO吸收特征，被发现是一个很好的指标的混合程度的CO在H2O：CO实验室冰系统。从H2O吸收带强度在实验室冰混合后的变化，我们得出结论，天文水冰柱密度在各种视线可以低估高达25%，如果大量的CO和CO2混合。
英文摘要：
A laboratory study on the band profiles and band strengths of H2O in CO ice, and vice versa, is presented and interpreted in terms of two models. The results show that a mutual interaction takes place between the two species in the solid, which alters the band positions and band strengths. It is found that the band strengths of the H2O bulk stretch, bending and libration vibrational bands decrease linearly by a factor of up to 2 when the CO concentration is increased from 0 to 80%. By contrast, the band strength of the free OH stretch increases linearly. The results are compared to a recently performed quantitative study on H2O:CO2 ice mixtures. It is shown that for mixing ratios of 1:0.5 H2O:X and higher, the H2O bending mode offers a good tracer to distinguish between CO2 or CO in H2O ice. Additionally, it is found that the band strength of the CO fundamental remains constant when the water concentration is increased in the ice. The integrated absorbance of the 2152 cm-1 CO feature, with respect to the total integrated CO absorption feature, is found to be a good indicator of the degree of mixing of CO in the H2O:CO laboratory ice system. From the change in the H2O absorption band strength in laboratory ices upon mixing we conclude that astronomical water ice column densities on various lines of sight can be underestimated by up to 25% if significant amounts of CO and CO2 are mixed in.
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