热分子从光子辐照的星际冰的解吸
Desorption of hot molecules from photon irradiated interstellar ices
摘要：
我们目前的实验测量的光解吸从天体物理相关的冰。用调谐到苯分子中电子跃迁的激光照射苯和水冰的层。通过飞行时间（ToF）质谱法测量解吸分子的平移能。确定了三种不同的光解吸过程-直接吸附物介导的解吸产生平移温度约为1200 K的苯分子，间接吸附物介导的解吸产生平移温度约为450 K的水分子，以及苯和水产生分子的基底介导的解吸，其平移温度分别为约530 K和450 K。每个解吸附分子群体的平移温度远高于冰基质的温度。气相化学在星际介质的影响进行了讨论。
英文摘要：
We present experimental measurements of photodesorption from ices of astrophysical relevance. Layers of benzene and water ice were irradiated with a laser tuned to an electronic transition in the benzene molecule. The translational energy of desorbed molecules was measured by time-of-flight (ToF) mass spectrometry. Three distinct photodesorption processes were identified - a direct adsorbate-mediated desorption producing benzene molecules with a translational temperature of around 1200 K, an indirect adsorbate-mediated desorption resulting in water molecules with a translational temperature of around 450 K, and a substrate-mediated desorption of both benzene and water producing molecules with translational temperatures of around 530 K and 450 K respectively. The translational temperature of each population of desorbed molecules is well above the temperature of the ice matrix. The implications for gas-phase chemistry in the interstellar medium are discussed.
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