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<H1>Research at Po&aacute;s Volcano, Costa Rica</H1>
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<BR>The crater of Po&aacute;s Volcano, Costa Rica

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<P>We collected aerosol particles in and around Po&aacute;s' crater, and then examined their compositions and morphologies using transmission electron microscopy (TEM) and atomic force microscopy (a very high-resolution type of SEM).</P>
 
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<IMG SRC="Poas1_files/image003.png" WIDTH="275" HEIGHT="292" BORDER="3">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<IMG SRC="Poas1_files/image005.png" WIDTH="300" HEIGHT="204" BORDER="3">
<BR>(left) SEM picture of an aerosol collected in the plume of Po&aacute;s
Volcano.  (right) Composition of the aerosol.

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<H3>Publication from this work:</H3>

<P CLASS="reference">Pfeffer, M.A.*, Rietmeijer, F.J.M., Brearley, A.J., & <B>Fischer, T.P.</B> (2006). Electron microbeam analyses of aerosol particles from the plume of Po&aacute;s Volcano, Costa Rica and comparison with equilibrium plume chemistry modeling. <I>J. Volcanology and Geothermal Research</I>, 152(1-2), 174-188. doi:10.1016/j.jvolgeores.2005.10.009.</P>

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<P CLASS="note">* Fischer's student</P>

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