<div dir="ltr"><div>Dear David,</div><div><br></div><div>Like the others have already said, there is no problem with the plasma cleaners' pump exhaust venting directly into the lab. In the old days, the problem was more the oil fumes from the oil pumps - those required handling of the exhaust. I presume that nowadays you have an oil-free pump. What vents into the atmosphere is the exhaust of the pump, not from the plasma cleaner itself, and there are no high-energy ions in the pump exhaust any more: a low enough pressure is required to create the plasma. You can actually demonstrate this to your colleague by turning on the coils and watching the glow: it will appear only when the pressure is low enough.</div><div><br></div><div>This is different from the UVOzone cleaners, which release significant amounts of ozone and require proper exhaust handling. </div><div><br></div><div>Good luck. :) </div><div><br></div><div>Ilya.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Feb 15, 2024 at 4:51 AM Sylvain Trepout <<a href="mailto:sylvain.trepout@monash.edu">sylvain.trepout@monash.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi David,<div><br></div><div>This might be your solution story.</div><div><br></div><div>During plasma cleaning, the pump is on. Meaning that the plasma is being sucked-up by the pump.</div><div>Since the pump is equipped with a small filter, there is no plasma released by the glow-discharger.</div><div>And you might also want to tell your colleague that venting goes the other way around, that is air from the room that goes inside the glow-discharger, not the opposite.</div><div><br></div><div>Cheers,</div><div>Sylvain</div><div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><p style="color:rgb(34,34,34);margin-bottom:0px"><span style="color:rgb(80,80,80);font-family:sans-serif">PhD</span><br>Research Fellow - Microscopy Australia</p><p style="color:rgb(34,34,34);margin-bottom:0px"><b>Monash University</b><br></p><span style="color:rgb(34,34,34)">Ramaciotti Centre for Cryo-EM</span><br style="color:rgb(34,34,34)"><span style="color:rgb(34,34,34)">G</span><span style="color:rgb(34,34,34)">92, 15 Innovation Walk, Clayton Campus</span><br style="color:rgb(34,34,34)"><span style="color:rgb(34,34,34)">Victoria, 3800 Australia</span><p style="color:rgb(80,80,80);font-family:sans-serif;margin-bottom:0px">E: <a href="mailto:sylvain.trepout@monash.edu" style="color:rgb(17,85,204)" target="_blank">sylvain.trepout@monash.edu</a></p></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 15 Feb 2024 at 14:37, Morgan, David Gene <<a href="mailto:dagmorga@indiana.edu" target="_blank">dagmorga@indiana.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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Ruben,</div>
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That's my thought also, but one of the staff members seems to think that it will vent "plasma" into the lab. I've tried to convince her that's not a thing and that what does get vented isn't a problem, but to no avail. So I was hoping to show her that I'm
not the only person who believes this...</div>
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Wish me luck :-)<br>
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<b>Sent:</b> Wednesday, February 14, 2024 10:22 PM<br>
<b>To:</b> Morgan, David Gene <<a href="mailto:dagmorga@indiana.edu" target="_blank">dagmorga@indiana.edu</a>><br>
<b>Cc:</b> <a href="mailto:3dem@ncmir.ucsd.edu" target="_blank">3dem@ncmir.ucsd.edu</a> <<a href="mailto:3dem@ncmir.ucsd.edu" target="_blank">3dem@ncmir.ucsd.edu</a>><br>
<b>Subject:</b> [External] Re: [3dem] plasma cleaner question</font>
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<div style="font-family:garamond,"times new roman",serif">Hi David,</div>
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<div style="font-family:garamond,"times new roman",serif">We have also a Fischione plasma cleaner, to which we have connected a Nitrogen and an Argon tank. The instrument vents to the lab and EH & S has no problem with that. I don't think
the process of plasma cleaning would produce any noxious gases anyway.</div>
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<div style="font-family:garamond,"times new roman",serif">Ruben.</div>
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<div dir="ltr">On Wed, Feb 14, 2024 at 12:48 PM Morgan, David Gene <<a href="mailto:dagmorga@indiana.edu" target="_blank">dagmorga@indiana.edu</a>> wrote:<br>
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Hi,</div>
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This is for any of you who have a plasma cleaner. What have you done about venting the "exhaust gases" from the device? </div>
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We are moving our Fischione plasma cleaner into a new area sample prep area. In the old location, we were able to connect the exit port of the cleaner directly into the exhaust snorkel where a fume hood was once connected. In our new location, that will either
be impossible or will require a connection that spans many meters and passes through multiple walls. </div>
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I am wondering how necessary people think it is to vent directly into some sort of building exhaust system. Any thoughts?</div>
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As always, thanks in advance for your comments and ideas.<br>
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<div style="margin:0px;font-family:Calibri,Arial,Helvetica,sans-serif"><span style="font-size:12pt;color:rgb(0,0,0)"> politics is more difficult than physics.</span></div>
<div style="margin:0px;font-family:Calibri,Arial,Helvetica,sans-serif"><span style="font-size:12pt;color:rgb(0,0,0)"> A. Einstein</span></div>
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<div style="margin:0px;font-family:Calibri,Arial,Helvetica,sans-serif"><span style="font-size:12pt;color:rgb(0,0,0)"> David Gene Morgan<br>
Electron Microscopy Center<br>
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