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A NEW DESORPTION MECHANISM FOR CONDENSED PHASE INTERSTELLAR CO

机译:凝聚相星际CO的一种新的脱附机理

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We have shown previously that weakly bound CO can be desorbed from both ice and hydrated silica (SiO_2 with surface water molecules) by a novel mechanism in which (1) a neighboring OH group is excited to its v = 1 vibrational state and (b) the energy is transferred via a dipole-dipole interaction to CO, where at least part of it is stored in the librational-physisorption modes of the adsorbed molecule, leading to desorption on a short timescale. In this Letter, we utilize the results of our previous work to estimate the desorption rate of CO from hydrated silica grains via this mechanism in dense interstellar clouds. The rate is estimated to be sufficiently rapid to keep a large percentage of CO off grains with polar (water ice-dominated) mantles. One uncertainty in the rate determination derives from an uncertainty in the proper infrared flux at 3.05 μm.
机译:先前我们已经表明,弱结合的CO可以通过一种新的机理从冰和水合二氧化硅(具有表面水分子的SiO_2)中解吸,其中(1)一个相邻的OH基团被激发到其v = 1振动状态,而(b)能量通过偶极-偶极相互作用转移到CO,其中至少有一部分以被吸收分子的自由-物理吸附模式存储,导致短时解吸。在这封信中,我们利用以前的工作结果,通过这种机制估算了密集星际云中水合二氧化硅颗粒中CO的解吸速率。据估计,该速率足够快,可以使大部分带有极性(水冰为主)地幔的谷物脱离一氧化碳。速率确定中的一个不确定性来自于3.05μm的适当红外通量的不确定性。

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