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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Chris,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">What kind of crucible liner are you using for the metals? It sounds like you are using an insulating crucible liner like Al2O3? If so, you are not allowing the electrons to ground out. This can then cause
charging effects that you may be seeing. Try switching to an electrically conductive crucible liner and this problem should go away for the metals.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Take care.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Rob<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> labnetwork <labnetwork-bounces@mtl.mit.edu>
<b>On Behalf Of </b>Chris Cott<br>
<b>Sent:</b> Tuesday, April 15, 2025 3:01 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Glow around metals during ebeam evaporation<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<span style="font-size:9.0pt;font-family:wf_segoe-ui_normal;color:#212121">You don't often get email from
<a href="mailto:chris.cott@nanomelbourne.com">chris.cott@nanomelbourne.com</a>. <a href="https://aka.ms/LearnAboutSenderIdentification">
Learn why this is important</a> <o:p></o:p></span></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">We have been noticing an intermittent issue in two of our ebeam evaporators.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The symptoms are:<o:p></o:p></p>
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<p class="MsoNormal">- A blue/green glow around the area the beam contacts the material<o:p></o:p></p>
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<p class="MsoNormal">- Higher than usual power requirements to evaporate<o:p></o:p></p>
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<p class="MsoNormal">- Partial deflection of the beam (e.g., a sweep pattern that is usually contained within the crucible starts to contact the edges)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This happens only sometimes and only with certain materials, including Ag and Cu.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is anyone familiar with this and its cause? Is the glow plasma or Bremsstrahlung from electrons being deflected? Can anyone point us in the right direction towards a solution to the issue?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks in advance!<o:p></o:p></p>
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<p class="MsoNormal">Chris<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:black">-------------------------------------------------------------------------------------------<br>
Chris Cott <i>BAppSc, BSc, PhD.</i></span> <o:p></o:p></p>
<p style="margin:0in"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:black">Process Engineer,</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:black">Melbourne Centre for Nanofabrication</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:black">151 Wellington Road, Clayton 3168</span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:black">Victorian Node of the Australian National Fabrication Facility</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:black">Ph: </span><span style="color:black">+61 (3) 9905 1562</span>
<o:p></o:p></p>
<p style="margin:0in"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:black">W: <a href="http://nanomelbourne.com/" target="_blank">http://nanomelbourne.com</a></span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:black">W: <a href="http://anff.org.au/" target="_blank">http://www.anff.org.au</a></span><o:p></o:p></p>
<p style="margin:0in"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:black">E: <a href="mailto:chris.cott@nanomelbourne.com" target="_blank"> chris.cott@nanomelbourne.com</a></span><o:p></o:p></p>
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