Open AccessIonization and dissociation of cometary gaseous organic molecules by solar wind particles – I. Formic acid
Author(s) -
Pilling S.,
Santos A. C. F.,
Wolff W.,
Sant'Anna M. M.,
Barros A. L. F.,
De Souza G. G. B.,
De Castro Faria N. V.,
BoechatRoberty H. M.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10949.x
Subject(s) - physics , atomic physics , ionization , dissociation (chemistry) , solar wind , electron , formic acid , photodissociation , proton , electron ionization , momentum transfer , range (aeronautics) , scattering , photochemistry , plasma , nuclear physics , ion , chemistry , materials science , chromatography , quantum mechanics , optics , composite material
In order to simulate the effects of energetic charged particles present in the solar wind colliding with the cometary gaseous formic acid molecule (HCOOH), laboratory experiments have been performed. The absolute ionization and dissociation cross‐sections for this molecule interacting with solar wind particles were measured employing fast electrons in the energy range of 0.5 to 2 keV and energetic protons with energies varying from 0.128 to 2 MeV. Despite the fact that both projectiles lead to a very similar fragmentation pattern, differences in the relative intensities of the fragments were observed. Formic acid survives about four to five times more to the proton beam than to the energetic electron collision. The minimum momentum transfer in the electron impact case was estimated to be 3–38 per cent larger than the minimum momentum transfer observed with the equivelocity protons. The ultraviolet (UV) photodissociation rates and half‐lives for HCOOH are roughly closer to the values obtained with energetic electrons. It is consequently important to take electron impact data into account when developing chemical models to simulate the interplanetary conditions.