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The influence of particle shapes and sizes in the CO ice stretching mode

机译：颗粒形状和大小对CO冰拉伸模式的影响

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Ices are major components of dust grains in the interstellar medium, with H2O, CO, and CO2 ices being the most ubiquitous. We have studied the influence of particle shapes and sizes on the profile of the CO ice stretching mode by means of computational calculations. The extinction factors were calculated using Mie and DDA codes for a number of shapes and size parameters, ranging from the Rayleigh regime up to 3. A scattering peak displaced towards the reddish wavelength for size parameters larger than 1 was observed in all cases considered, independently of the ice (CO and CO2), the shapes (sphere, spheroid with axial proportion 5, DW1999, and aggregates), and the inclusion of other constituents, such as silicate. We have attributed this fact to the grain growth. Certain shapes also produced a double-peaked profile but in the wavelength range in which the surface modes can be observed. The calculations, including those for silicate, show a decrease in the band strength but the changes in the stretching mode profile of CO ice are not significant.
机译：冰是星际介质中尘埃颗粒的主要成分，其中H2O，CO和CO2冰最普遍。我们已经通过计算计算研究了颗粒形状和尺寸对CO冰拉伸模式轮廓的影响。使用Mie和DDA代码计算了许多形状和尺寸参数的消光因子，范围从瑞利范围到3。在所考虑的所有情况下，观察到的散射参数在大于1的情况下都朝着微红色波长位移，在所有情况下均独立观察到冰（CO和CO2）的形状，形状（球形，轴向比例为5的球体，DW1999和聚集体）以及其他成分（例如硅酸盐）的含量。我们将此事实归因于谷物的增长。某些形状还产生了双峰轮廓，但在可观察到表面模态的波长范围内。包括硅酸盐在内的计算显示出带强度降低，但是CO冰的拉伸模式分布的变化并不显着。

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