Astronomy & Astrophysics

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$\begin{figure} \par {\includegraphics[width=7.5cm,clip]{0130fig1.EPS} } \end{figure}$ Figure 1: Column density ( $\times 10^{17}$ ${\rm molecules~ cm^{-2}}$ ) of the water ice stretching band as a function of the ion fluence for 200 keV He⁺ and 400 keV Ar⁺⁺ at temperatures of 16 and 77 K.
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In the text

$\begin{figure} \par {\includegraphics[width=7.5cm,clip]{0130fig2.EPS} } \end{figure}$ Figure 2: IR transmission spectra of H₂O ice as deposited (solid line) and after irradiation with 200 keV H⁺ at 77 K with fluences of $0.4 \times 10^{14}$ and $2.4 \times 10^{14}$ ${\rm ions~ cm^{-2}}$ (dashed and dotted lines respectively). The appearance of an absorption band centered at 2852 cm^-1 testifies to the formation of hydrogen peroxide molecules. The spectra after irradiation are shifted downwards for clarity.
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In the text

$\begin{figure} \par\includegraphics[width=10cm,clip]{0130fig3.eps} \end{figure}$ Figure 3: Percentage of H₂O₂/H₂O in number of molecules for each of the used ions at temperatures of 16 and 77 K. The ratio is plotted as a function of the ion fluence ( ${\rm ions~ cm^{-2}}$ ).
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In the text

$\begin{figure} \par {\includegraphics[width=7.4cm,clip]{0130fig4.EPS} } \end{figure}$ Figure 4: H₂O₂/H₂O(%) production (in number of molecules) after irradiation of thin films of water ice at a temperature of 16 K. The used ions are 200 keV of H⁺ and He⁺, and 400 of Ar⁺⁺. The H₂O₂/H₂O(%) ratio has been plotted as a function of the energy deposited in the target measured in eV/16 amu.
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In the text

$\begin{figure} \par {\includegraphics[width=7.6cm,clip]{0130fig5.EPS} } \end{figure}$ Figure 5: H₂O₂/H₂O(%) production (in number of molecules) after irradiation of thin films of water ice at a temperature of 77 K. The used ions are 200 keV of H⁺ and He⁺, and 400 of Ar⁺⁺. The H₂O₂/H₂O(%) ratio has been plotted as a function of the energy deposited in the target measured in eV/16 amu.
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In the text

$\begin{figure} \par {\includegraphics[width=7.5cm,clip]{0130fig1.EPS} } \end{figure}$	Figure 1: Column density ( $\times 10^{17}$ ${\rm molecules~ cm^{-2}}$ ) of the water ice stretching band as a function of the ion fluence for 200 keV He⁺ and 400 keV Ar⁺⁺ at temperatures of 16 and 77 K.
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$\begin{figure} \par\includegraphics[width=10cm,clip]{0130fig3.eps} \end{figure}$	Figure 3: Percentage of H₂O₂/H₂O in number of molecules for each of the used ions at temperatures of 16 and 77 K. The ratio is plotted as a function of the ion fluence ( ${\rm ions~ cm^{-2}}$ ).
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$\begin{figure} \par {\includegraphics[width=7.4cm,clip]{0130fig4.EPS} } \end{figure}$	Figure 4: H₂O₂/H₂O(%) production (in number of molecules) after irradiation of thin films of water ice at a temperature of 16 K. The used ions are 200 keV of H⁺ and He⁺, and 400 of Ar⁺⁺. The H₂O₂/H₂O(%) ratio has been plotted as a function of the energy deposited in the target measured in eV/16 amu.
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$\begin{figure} \par {\includegraphics[width=7.6cm,clip]{0130fig5.EPS} } \end{figure}$	Figure 5: H₂O₂/H₂O(%) production (in number of molecules) after irradiation of thin films of water ice at a temperature of 77 K. The used ions are 200 keV of H⁺ and He⁺, and 400 of Ar⁺⁺. The H₂O₂/H₂O(%) ratio has been plotted as a function of the energy deposited in the target measured in eV/16 amu.
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