宇宙射线对CO冰的轰击：I.对分子破坏和溅射微观物理学的实验见解
Bombardment of CO ice by cosmic rays: I. Experimental insights into the microphysics of molecule destruction and sputtering
摘要：
我们提出了一个专门的实验研究的微观机制控制辐解和溅射的天体物理冰，由于它们的轰击宇宙射线离子。这些离子由于与束缚电子的非弹性碰撞而减慢，导致冰分子的电离和激发。在CO冰照射的实验中，我们表明，这两种机制的能量损失分子破坏和溅射的相对贡献，可以通过选择离子能量附近的电子阻止本领的峰值进行探测。我们已经观察到一个显着的不对称性，无论是在破坏截面和溅射产率，对离子能量对应于相同的值的阻止功率的任何一侧的峰值。这意味着阻止本领并不像文献中通常假设的那样单独控制这些过程。我们的研究结果表明，电子激发代表了一个显着更有效的渠道辐解，也可能是溅射的CO冰。我们还表明，入射离子的电荷状态，以及在冰中的CO $^+$生产率对这些过程的影响可以忽略不计。
英文摘要：
We present a dedicated experimental study of microscopic mechanisms controlling radiolysis and sputtering of astrophysical ices due to their bombardment by cosmic ray ions. Such ions are slowed down due to inelastic collisions with bound electrons, resulting in ionization and excitation of ice molecules. In experiments on CO ice irradiation, we show that the relative contribution of these two mechanisms of energy loss to molecule destruction and sputtering can be probed by selecting ion energies near the peak of the electronic stopping power. We have observed a significant asymmetry, both in the destruction cross section and the sputtering yield, for pairs of ion energies corresponding to same values of the stopping power on either side of the peak. This implies that the stopping power does not solely control these processes, as usually assumed in the literature. Our results suggest that electronic excitations represent a significantly more efficient channel for radiolysis and, possibly, also for sputtering of CO ice. We also show that the charge state of incident ions as well as the rate for CO$^+$ production in the ice have negligible effect on these processes.
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