ARTÍCULO
Radiolysis of carbon-dioxide ice by swift Ti and Xe ions
Fecha
2015Registro en:
0168-583X
10.1016 / j.nimb.2015.09.039
Autor
Rothard, Hermann
Trautmann, Christina
Boduch, PHilippe
Bender, Markus
Bordalo, Vinicius
LV, Xue Yang
Mejia Guaman, Christian Fernando
Domaracka, Alicja
Martínez Rodríguez, Rafael Eduardo
Severin, Daniel
Institución
Resumen
Ices (H2O, CO, CO2, NH3, ..) are omnipresent in space
on comets, the moons of giant planets, dust grains in
dense clouds (the birthplaces of stars and planetary systems). They are exposed to cosmic rays, which in turn
induce radiolysis, i.e. fragmentation of initial molecules,
formation of radicals, and subsequent synthesis of molecules. Even complex pre-biotic molecules such as amino
acids can be formed. Due to their high electronic energy
loss the heavy ion fraction in cosmic rays yields nonnegligible contributions to sputtering and radiolysis, even
if protons and alpha particles are more abundant [1].
Heavy-ion beams from large accelerator facilities are
useful to simulate the specific effects induced by the
heavy ion fraction of cosmic radiation in the laboratory.
We complemented the experiments (550 MeV Ti beams)
reported in [2] at the UNILAC M-branch, by irradiation
with 630 MeV Xe beams. On-line Fourier transform infrared absorption spectroscopy (FTIR) allowed us to follow molecule destruction and synthesis in CO2 ice deposited at approx. 20 K on a CsI substrate.