Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...213..351l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 213, no. 1-2, April 1989, p. 351-359.
Astronomy and Astrophysics
Astrophysics
67
Hydrocarbons, Interstellar Chemistry, Molecular Absorption, Photodissociation, Thermal Dissociation, Electron Transitions, Grain Size, Radiation Distribution, Reflection Nebulae, Specific Heat, Vibrational Spectra
Scientific paper
Photothermodissociation (PTD) of an isolated molecule is the name of the process when a photon is absorbed by an electronic transition, the energy is transferred to the vibrations (hot molecule) and then an atom or a fragment is ejected. A statistical physics treatment is presented that goes beyond the thermal approximation and fully takes into account the isolation of the system. A model is given that permits an explicit calculation of the ejection rates of hydrogen and carbon fragments from aromatic molecules as a function of their size and internal energy. Then, the lifetime of species against PTD in different astronomical radiation fields will result when a precise dynamical evolution of their internal energy can be established.
Boissel Pierre
d'Hendecourt Louis
Desert François Xavier
Leger Alain
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