Profile of the CO 2 bands produced after ion irradiation of ice mixtures
نویسنده
چکیده
We have studied the infrared spectral characteristics of frozen carbon dioxide (CO2) formed after ion irradiation of several astrophysically relevant ice mixtures at 10 K. Carbon dioxide is in fact readily produced by ion irradiation of icy samples of CO, and CH3OH and mixtures H2O:CO, CO:O2, CO:N2, H2O:CH3OH, H2O:CH4, H2O:CH4:NH3. We have studied the profile (shape, width and peak position) of the CO2 bands as a function of initial mixture, irradiation dose and warming up temperature.
منابع مشابه
Is it possible to detect frozen O 2 and N 2 on interstellar grains ?
We continue to study the effects of ion irradiation on frozen ices with a view to their astrophysical relevance. The technique used to evidence molecular alteration is " in situ " in-frared (IR) spectroscopy. Here, we present results obtained irradiating by 3-60 keV helium and argon ions, frozen CO, and mixtures CO:O 2 and CO:N 2. The relevance of these studies for astrophysical applications is...
متن کاملProfile of CH4 IR bands in ice mixtures
We studied the infrared spectral characteristics of frozen methane (CH4) in several astrophysically relevant ice mixtures, as deposited and after ion irradiation. We examined the profile (shape, width and peak position) of the CH4 bands as a function of initial mixture, irradiation dose and warming up temperature, and compared our results with previously published laboratory and observational d...
متن کاملIon irradiation effects on frozen methanol (CH3OH)
We present some experimental results on the chemical-physical effects induced by ion irradiation on frozen methanol (CH3OH), pure and mixed with water (H2O). We have studied, by “in situ” infrared (IR) spectroscopy, samples of solid CH3OH and H2O:CH3OH mixtures before and after irradiation, with 3-30 keV ions, at low pressures and low temperature (10 K). We have derived the integrated absorbanc...
متن کاملLaboratory studies of thermally processed H2O-CH3OH-CO2 ice mixtures and their astrophysical implications
Data of the Infrared Space Observatory ISO have strongly influenced the current view of interstellar ice chemistry. ISO and ground-based results have confirmed that the most abundant ice species in warm regions close to massive protostars are H2O, CO2, and CH3OH. Ice segregation in those environments reflects the extensive thermal processing of grains over the lifetime of protostars. We present...
متن کاملSpectroscopic constraints on CH3OH formation: CO mixed with CH3OH ices towards young stellar objects
The prominent infrared absorption band of solid CO – commonly observed towards young stellar objects (YSOs) – consists of three empirically determined components. The broad ‘red component’ (2136 cm−1, 4.681 μm) is generally attributed to solid CO mixed in a hydrogenbonded environment. Usually, CO embedded in the abundantly present water is considered. However, CO:H2O mixtures cannot reproduce t...
متن کامل