All Figures

$\begin{figure} \par\includegraphics[width=8cm,clip]{0188fig1.eps}\end{figure}$ Figure 1: The perturbed ion core (with charge Z=2) is located at A and the hydrogen perturbing core (a proton) at P. Their valence electrons are denoted by 1 and 2 respectively.
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In the text

$\begin{figure} \par\includegraphics[width=5.5cm,clip]{0188fig2.eps}\end{figure}$ Figure 2: Partial Grotrian diagram of CaII showing the levels and the spectral wavelengths in Å $\;$ of interest in this study. Note that the level spacings in not to scale.
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In the text

$\begin{figure} \par\includegraphics[width=8.3cm,clip]{0188fig3.eps}\end{figure}$ Figure 3: Destruction rate of orientation per unit H-atom density for the CaII ion, ${\rm D}^1(4 \; 1 \; 1/2, \; T)/n_{\rm H}$ , as a function of temperature T. ${\rm D}^1(4 \; 1 \; 1/2, \; T)$ / $n_{\rm H}$ is given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.3cm,clip]{0188fig4.eps}\end{figure}$ Figure 4: Depolarization rates per unit H-atom density for the CaII ion, ${\rm D}^k(4 \; 1 \; 3/2, \; T)/n_{\rm H}$ (k=1, 2, and 3), as a function of temperature T. ${\rm D}^k(4 \; 1 \; 3/2, \; T)$ / $n_{\rm H}$ are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.3cm,clip]{0188fig5.eps}\end{figure}$ Figure 5: Depolarization rates per unit H-atom density for the CaII ion, ${\rm D}^k(3 \; 2 \; 3/2, \; T)/n_{\rm H}$ (k=1, 2, and 3), as a function of temperature T. ${\rm D}^k(3 \; 2 \; 3/2, \; T)$ / $n_{\rm H}$ are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig6.eps}\end{figure}$ Figure 6: Depolarization rates per unit H-atom density for the CaII ion, ${\rm D}^k(3 \; 2 \; 5/2, \; T)/n_{\rm H}$ (k=1, 2, 3, 4, and 5), as a function of temperature T. ${\rm D}^k(3 \; 2 \; 5/2, \; T)$ / $n_{\rm H}$ are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig7.eps}\end{figure}$ Figure 7: Population and orientation transfer rates (k=0 and k=1), per unit H-atom density, as a function of temperature T. The rates are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig8.eps}\end{figure}$ Figure 8: Polarization transfer rates per unit H-atom density, ${\rm D}^k(3 \; 2 \; 3/2 \to 3 \; 2 \; 5/2, \; T)/n_{\rm H}$ , as a function of temperature T. The rates are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig9.eps}\par\includeg... ...{0188fig10.eps}\par\includegraphics[width=7.9cm,clip]{0188fig11.eps}\end{figure}$ Figure 9: Depolarization rates for k=2 as a function of temperature. Full lines: our results; dotted lines: quantum chemistry calculations (Kerkeni 2003); dot-dashed lines Van der Waals approximation.
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig12.eps}\end{figure}$ Figure 10: Depolarization cross section enhancement due to a Gaussian local perturbation of the potential. Cross sections are calculated for the relative velocities: $3 \; \textrm{km} \; \textrm{s}^{-1}$ , $10 \; \textrm{km} \; \textrm{s}^{-1}$ and $17 \; \textrm{km} \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig13.eps}\end{figure}$ Figure 11: Dependence on $E_{\rm p}$ of the destruction rate of alignment ${\rm D}^2(4 \; 1 \; 3/2,$ 5000 K)/ $n_{\rm H}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig14.eps}\end{figure}$ Figure 12: Destruction rate of orientation per unit H-atom density for the SrII ion, ${\rm D}^1(5 \; 1 \; 1/2, \; T)/n_{\rm H}$ , as a function of the temperature of the medium, T. ${\rm D}^1(5 \; 1 \; 1/2, \; T)$ / $n_{\rm H}$ is given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig15.eps}\end{figure}$ Figure 13: Depolarization rates, ${\rm D}^k(5 \; 1 \; 3/2, \; T)/n_{\rm H}$ (k=1, 2, and 3), as a function of temperature T. ${\rm D}^k(5 \; 1 \; 3/2, \; T)$ / $n_{\rm H}$ are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig16.eps}\end{figure}$ Figure 14: Population and orientation transfer rates (k=0 and k=1) for the SrII ion, per unit H-atom density, as a function of temperature T. The rates are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{0188fig1.eps}\end{figure}$	Figure 1: The perturbed ion core (with charge Z=2) is located at A and the hydrogen perturbing core (a proton) at P. Their valence electrons are denoted by 1 and 2 respectively.
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$\begin{figure} \par\includegraphics[width=5.5cm,clip]{0188fig2.eps}\end{figure}$	Figure 2: Partial Grotrian diagram of CaII showing the levels and the spectral wavelengths in Å $\;$ of interest in this study. Note that the level spacings in not to scale.
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$\begin{figure} \par\includegraphics[width=8.3cm,clip]{0188fig3.eps}\end{figure}$	Figure 3: Destruction rate of orientation per unit H-atom density for the CaII ion, ${\rm D}^1(4 \; 1 \; 1/2, \; T)/n_{\rm H}$ , as a function of temperature T. ${\rm D}^1(4 \; 1 \; 1/2, \; T)$ / $n_{\rm H}$ is given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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$\begin{figure} \par\includegraphics[width=8.3cm,clip]{0188fig4.eps}\end{figure}$	Figure 4: Depolarization rates per unit H-atom density for the CaII ion, ${\rm D}^k(4 \; 1 \; 3/2, \; T)/n_{\rm H}$ (k=1, 2, and 3), as a function of temperature T. ${\rm D}^k(4 \; 1 \; 3/2, \; T)$ / $n_{\rm H}$ are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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$\begin{figure} \par\includegraphics[width=8.3cm,clip]{0188fig5.eps}\end{figure}$	Figure 5: Depolarization rates per unit H-atom density for the CaII ion, ${\rm D}^k(3 \; 2 \; 3/2, \; T)/n_{\rm H}$ (k=1, 2, and 3), as a function of temperature T. ${\rm D}^k(3 \; 2 \; 3/2, \; T)$ / $n_{\rm H}$ are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig6.eps}\end{figure}$	Figure 6: Depolarization rates per unit H-atom density for the CaII ion, ${\rm D}^k(3 \; 2 \; 5/2, \; T)/n_{\rm H}$ (k=1, 2, 3, 4, and 5), as a function of temperature T. ${\rm D}^k(3 \; 2 \; 5/2, \; T)$ / $n_{\rm H}$ are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig7.eps}\end{figure}$	Figure 7: Population and orientation transfer rates (k=0 and k=1), per unit H-atom density, as a function of temperature T. The rates are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig8.eps}\end{figure}$	Figure 8: Polarization transfer rates per unit H-atom density, ${\rm D}^k(3 \; 2 \; 3/2 \to 3 \; 2 \; 5/2, \; T)/n_{\rm H}$ , as a function of temperature T. The rates are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig9.eps}\par\includeg... ...{0188fig10.eps}\par\includegraphics[width=7.9cm,clip]{0188fig11.eps}\end{figure}$	Figure 9: Depolarization rates for k=2 as a function of temperature. Full lines: our results; dotted lines: quantum chemistry calculations (Kerkeni 2003); dot-dashed lines Van der Waals approximation.
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig12.eps}\end{figure}$	Figure 10: Depolarization cross section enhancement due to a Gaussian local perturbation of the potential. Cross sections are calculated for the relative velocities: $3 \; \textrm{km} \; \textrm{s}^{-1}$ , $10 \; \textrm{km} \; \textrm{s}^{-1}$ and $17 \; \textrm{km} \; \textrm{s}^{-1}$ .
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig13.eps}\end{figure}$	Figure 11: Dependence on $E_{\rm p}$ of the destruction rate of alignment ${\rm D}^2(4 \; 1 \; 3/2,$ 5000 K)/ $n_{\rm H}$ .
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig14.eps}\end{figure}$	Figure 12: Destruction rate of orientation per unit H-atom density for the SrII ion, ${\rm D}^1(5 \; 1 \; 1/2, \; T)/n_{\rm H}$ , as a function of the temperature of the medium, T. ${\rm D}^1(5 \; 1 \; 1/2, \; T)$ / $n_{\rm H}$ is given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig15.eps}\end{figure}$	Figure 13: Depolarization rates, ${\rm D}^k(5 \; 1 \; 3/2, \; T)/n_{\rm H}$ (k=1, 2, and 3), as a function of temperature T. ${\rm D}^k(5 \; 1 \; 3/2, \; T)$ / $n_{\rm H}$ are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0188fig16.eps}\end{figure}$	Figure 14: Population and orientation transfer rates (k=0 and k=1) for the SrII ion, per unit H-atom density, as a function of temperature T. The rates are given in $\textrm{rad} \; \textrm{m}^3 \; \textrm{s}^{-1}$ .
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