| Issue |
A&A
Volume 384, Number 1, MarchII 2002
|
|
|---|---|---|
| Page(s) | 343 - 349 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20011835 | |
| Published online | 15 March 2002 | |
A comparison of ion irradiation and UV photolysis of CH4 and CH3OH
Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy
Corresponding author: M. E. Palumbo, mepalumbo@alpha4.ct.astro.it
Received:
4
October
2001
Accepted:
20
December
2001
We have studied by infrared absorption spectroscopy the effects induced by fast ions (30 keV) and Lyman-α photons (10.2 eV) on some molecular ices at low temperature (10–20 K). It is well known that in both cases the physical and chemical properties of the ices are modified. However while the energy released by ions depends mainly on their energy and on the target species, the effects induced by photons also depend on the optical properties of the sample. Here we show that the effects of ion irradiation and UV photolysis are comparable on fresh ices (i.e. at low doses) but are increasingly different as processing is continued (i.e. at high doses).
Key words: astrochemistry / molecular processes / methods: laboratory / techniques: spectroscopic / ISM: molecules
© ESO, 2002
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