论文标题
天体化学性质：氧化学的自催化
Astrochemical Bistability: Autocatalysis in Oxygen Chemistry
论文作者
论文摘要
描述密集星际云化学的动力学方程中可动溶液的起源被解释为是由于氧二聚体（O2）的自催化和氧核的反馈。我们确定了四个可以在密集的分子云中运行的自催化过程，分别由H+，He+，C+和S+与O2的反应驱动。我们表明，这些过程可以产生先前研究中发现的双态溶液，以及对各种模型参数的依赖性，例如氦电离速率，硫耗尽和{H} 3+电子重组速率。我们还表明，离子元中和不太可能影响致密云中的双重性。指出的是，许多天文来源的化学模型应该具有显示双溶液的潜力。
The origin of bistable solutions in the kinetic equations describing the chemistry of dense interstellar clouds is explained as being due to the autocatalysis and feedback of oxygen nuclei from the oxygen dimer (O2). We identify four autocatalytic processes that can operate in dense molecular clouds, driven respectively by reactions of H+, He+, C+, and S+ with O2. We show that these processes can produce the bistable solutions found in previous studies, as well as the dependence on various model parameters such as the helium ionization rate, the sulfur depletion and the {H}3+ electron recombination rate. We also show that ion-grain neutralizations are unlikely to affect the occurrence of bistability in dense clouds. It is pointed out that many chemical models of astronomical sources should have the potential to show bistable solutions.
