标题： 氢原子在低温表面的物理吸附再结合 显示英文标题

标题： Recombination of atomic Hydrogen physisorbed on low-temperature Surfaces

摘要： 利用低温热电偶作为（能量 - ）探测器的分子束实验非常适合研究氢在低温表面的物理吸附和重组。 结合质谱技术以检测从表面释放的原子和分子的实验被总结并回顾，并与天体物理学意义相关联。 显示了物理吸附在多晶水冰上的氢原子足够活跃，即使在表面温度低至3K时也能高效重组。形成的分子具有相当高的内能，可能约为35000K，并且一旦形成就会立即释放。 分子氢的覆盖程度在决定整体重组效率方面起着重要作用，可能在星际云中自我调节重组：在无氢颗粒上，重组受氢原子低附着系数的限制；而在被分子氢覆盖的颗粒上，由于吸附原子快速蒸发，重组受到限制。 显示英文摘要

摘要： Molecular beam experiments that use low-temperature bolometers as (energy-) detectors are well suited to the study of physisorption and recombination of hydrogen on low-temperature surfaces. Experiments where this technique is combined with mass spectrometry to examine atoms and molecules released from the surface are summarised and reviewed with reference to astrophysical implications. Hydrogen atoms physisorbed on polycrystalline water ice are shown to be sufficiently mobile to recombine efficiently even at surface temperatures as low as 3 K. Molecules are formed with substantial internal energy, probably of the order of 35000 K, and are immediately released when formed. Coverage by molecular hydrogen plays an important role in determining overall recombination efficiency and may self-regulate recombination in interstellar clouds: on hydrogen-free grains recombination is limited by the low sticking coefficient of hydrogen atoms, while on grains covered by molecular hydrogen the binding energy is reduced so that recombination is limited by the rapid evaporation of physisorbed atoms.