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Gas phase Reactive processes of Astrochemical interest

AutorRoncero, Octavio
Fecha de publicación27-jun-2016
Citación7th International Meeting on Atomic and Molecular Physics and Chemistry (2016)
ResumenPhotodissociation and reactive collision rates are needed to properly account for the observed lines in different astrophysical environments and determine the physical conditions. Hydrogen is the most abundant element in space and low temperatures are typically found in molecular clouds. In this environments quantum effects are typically important. For this purpose the formation rates of simple hydrides like CH+ [1] and OH+[2], some of which were recently observed after the launch of Herschel in 2010, will by described obtained with quantum methods. Some of these molecules are very reactive and do not have time to thermalize, and therefore the state-to-state reactive rates determine the emission intensity of excited rotational states. In the cold environments one major protonator is the H3+ ion. Its formation through the H2 +H2+ [3]collisions and its subsequent ortho/para transformation in the H2 +H3+ [4] will also be described. In those cases a full quantum treatment is no possible at the low symmetry and the use of combined zero-point energy corrected quasi-classical results combined with statistical models to account for the nuclear spin permutation will be described. In regions with high UV flux, photodissociation is a fundamental event destroying molecules. HCN and its isomer HNC are widely detected in space, and in photodissociation regions the HNC/HCN ratio presents anomalies. In order to understand their photostability the photodissociation rate for both isomers in a wide range of excitation energies will be be also presented [5].
DescripciónIMAMPC 20016, Le Havre, Normandy, June 27-30 2016 ; https://imampc2016.sciencesconf.org/
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