<?xml version="1.0"?> <!DOCTYPE ipe SYSTEM "ipe.dtd"> <ipe version="70005" creator="Ipe 7.1.2"> <info created="D:20130513204549" modified="D:20130617212945"/> <ipestyle name="cust"> <symbol name="arrow/fnormal(spx)"> <path fill="black"> 0 0 m -1 0.333 l -1 -0.333 l h </path> </symbol> <pen name="heavier" value="0.8"/> <pen name="fat" value="1.2"/> <pen name="ultrafat" value="2"/> <symbolsize name="large" value="5"/> <symbolsize name="small" value="2"/> <symbolsize name="tiny" value="1.1"/> <arrowsize name="large" value="10"/> <arrowsize name="small" value="5"/> <arrowsize name="tiny" value="3"/> <dashstyle name="dashed" value="[4] 0"/> <dashstyle name="finedash" value="[2] 0"/> <textsize name="large" value="\large"/> <textsize name="small" value="\small"/> <textsize name="tiny" value="\tiny"/> <textsize name="Large" value="\Large"/> <textsize name="LARGE" value="\LARGE"/> <textsize name="huge" value="\huge"/> <textsize name="Huge" value="\Huge"/> <textsize name="footnote" 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dash="finedash"> 216 760 m 232 760 l </path> <path matrix="1 0 0 1 -120 -644" stroke="black" dash="finedash"> 168 696 m 200 696 l </path> <path matrix="1 0 0 1 -120 -644" stroke="black" dash="finedash"> 184 712 m 336 712 l </path> <text matrix="1 0 0 1 -124 -640" transformations="translations" pos="228 724" stroke="black" type="label" width="13.45" height="6.812" depth="1.49" halign="right" valign="baseline">$W_{\rm e}$</text> <text matrix="1 0 0 1 -60 -672" transformations="translations" pos="228 724" stroke="black" type="label" width="13.45" height="6.812" depth="1.49" valign="baseline">$W_{\rm c}$</text> <text matrix="1 0 0 1 -84 -644" transformations="translations" pos="136 704" stroke="black" type="label" width="23.651" height="6.812" depth="1.49" halign="right" valign="center">$e\Delta V_{\rm S}$</text> <text matrix="1 0 0 1 -120 -772" transformations="translations" pos="184 792" stroke="black" type="label" width="31.576" height="6.654" depth="0" halign="center" valign="baseline">emitter</text> <text matrix="1 0 0 1 -48 -772" transformations="translations" pos="184 792" stroke="black" type="label" width="33.486" height="4.289" depth="0" halign="center" valign="baseline">vacuum</text> <text matrix="1 0 0 1 4 -772" transformations="translations" pos="184 792" stroke="black" type="label" width="36.557" height="6.918" depth="0" halign="center" valign="baseline">collector</text> <text matrix="1 0 0 1 -40 -60" transformations="translations" pos="256 112" stroke="black" type="label" width="26.335" height="6.812" depth="1.49" valign="baseline">$e\Delta V_{\rm ce}$</text> <text matrix="1 0 0 1 66.663 -677.875" transformations="translations" pos="101.337 719.875" stroke="black" type="label" width="18.901" height="6.808" depth="2.85" valign="top">\textcolor[rgb]{0.3,0,0.3}{$E_{\rm F,c}$}</text> <text matrix="1 0 0 1 -104 -684" transformations="translations" pos="248 792" stroke="black" type="label" width="18.324" height="6.926" depth="1.93" 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