An Accessible Model of Dynamics and Cycle for Interstellar OH and H2O Maser Associations     

Hanping Liu  Jin Sun  T. Thissen 《Astrophysics and Space Science》2004,289(1-2):147-160

An accessible model for interstellar OH/H₂O maser associations is presented. It can be classified into radiative pumping model. It can close the dynamical cycle of H₂O and OH species, and can give an interpretation on interstellar OH/H₂O associations. A reasonable scheme for both regeneration and destruction of interstellar H₂O and OH molecules is argued. Our model has overcome the defects of former radiative models, and is compatible with astronomical conditions. It is shown that the rotational population of H₂O and OH in these regions is much less affected by collisions than by radiation. Some experiments have confirmed our proposal.  相似文献   

Sensitivity of a Titan ionospheric model to the ion-molecule reaction parameters     

N. Carrasco  C. Alcaraz  O. Dutuit  R. Thissen  R. Yelle 《Planetary and Space Science》2008,56(12):1644-1657

Various aspects of ion-molecule reactions for Titan ionospheric chemistry modeling are reviewed in this work: temperature/collision energy effects on reaction rates and, more importantly, on products distributions; differential reactivity of isomers of ions; reactivity of excited states of ions; pathways to the building of complex ions. We evaluate here the extent to which these points affect model predictions. We find that the present limiting factors to model predictivity are the model incompleteness for heavy ion production pathways; the differential reactivity of isomers; and, to a lesser degree, the temperature effects on the branching ratios of ion-molecule reactions. Extensive experimental studies are required to fill these gaps in ion-molecule reactivity knowledge.  相似文献