<div dir="ltr">Dear David,<div><br></div><div>Let me share my experience with semiconductor gas systems.</div><div><br></div><div>For supplying the gas from a liquid source like amylamine in a vacuum system like Pelco easiGlow, you need a "precursor gas generator". Despite its fancy name, it can be a very simple setup. In fact, this setup is very common in various systems like Chemical Vapor Deposition (CVD) and maybe you have already seen it in the environmental scanning electron microscopes (for water vapor supply or some liquid precursors for EBID, etc). In this set up you keep the liquid in a closed vessel like a glass balloon, and you keep the temperature around it fixed. The temperature determines the partial pressure of the gas which is necessary for the repeatability of the process. Normally, people put the balloon in a laboratory balloon heater or an ice bath, depending on the boiling point of the precursor and the desired partial pressure. The selection of the temperature is up to you. If your lab environment is stable enough and your gas consumption is also low enough, you can do it at room temperature without any additional device. In this case, you just need to have a big enough balloon and leave it to equilibrate. </div><div><br></div><div>Also, for more repeatability, you are advised to keep the pressure over the liquid vessel (the balloon) at a constant level. The reason is that for non-ideal gasses the partial pressure is slightly dependent on the system's pressure. For achieving that level of stability, you can set up a carrier gas inlet to the balloon like a bobbler. The carrier gas can be nitrogen, argon, or even air (just leave an open inlet to the bobbler. You can also keep balloons under a vacuum condition which is also another strategy for keeping the pressure constant! In this case, the setup is similar except the carrier gas pipe is not submerged in the liquid and it is connected to a vacuum pump.<br></div><div><br></div><div><b>Caution 1: There is a safety consideration for heating the vessel to near boiling point or working at high carrier gas pressure. If you want to have high partial pressure and hence you decide to heat the precursor to near its boiling temperature you need to consider a safety release valve and a reliable suction hood OR a higher pressure chamber. It is worthy of note that since evaporation needs time and energy, heating is always preferred for a more uniform gas composition. Glass balloons are not made to maintain very high pressures.</b><br></div><div><b><br></b></div><div><b>Caution 2: Should you need to inject multiple gasses you need to install mass flow controllers at the inlets after the bobblers. This guarantees a constant gas composition.</b></div><div><b><br></b></div><div>Hope these details help you make your bobbler (precursor gas generator).</div><div><br></div><div>Cheers,</div><div><br></div><div>Ferrie</div><div><b><br></b></div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div style="color:rgb(0,0,0)">Farzad Hamdi, Dr.-Ing</div><div style="color:rgb(0,0,0)">Scientist,</div><div style="color:rgb(0,0,0)">Kastritis Laboratory for Biomolecular Research</div><div style="color:rgb(0,0,0)"><span style="font-family:Helvetica,Arial,sans-serif;font-size:13px">Interdisciplinary research center HALOmem, </span></div><div style="color:rgb(0,0,0)"><span style="font-family:Helvetica,Arial,sans-serif;font-size:13px">Institute of Biochemistry and Biotechnology, </span><span style="font-family:Helvetica,Arial,sans-serif;font-size:13px">Biocenter, </span></div><div style="color:rgb(0,0,0)"><span style="font-family:Helvetica,Arial,sans-serif;font-size:13px">Martin Luther University Halle-Wittenberg, Halle (Saale), Germany</span></div><div style="color:rgb(0,0,0)">----------------------------------------------------------------------------------------</div><div style="color:rgb(0,0,0)">Martin-Luther-Universität Halle-Wittenberg</div><div style="color:rgb(0,0,0)">Biozentrum, Room A.2.14 & 15</div><div style="color:rgb(0,0,0)">IWE ZIK HALOmem NWG III</div><div style="color:rgb(0,0,0)">"Kryo-Elektronenmikroskopie an Membranproteinkomplexen"</div><div style="color:rgb(0,0,0)">Weinbergweg 22, 06120 Halle</div><div style="color:rgb(0,0,0)">Telefone:</div><div style="color:rgb(0,0,0)">Office: +49 345 5524984</div><div style="color:rgb(0,0,0)">Glacios Room: +49 345 5524883</div><div style="color:rgb(0,0,0)">JEM-3200FSC Room: +49 345 5524868 </div><div style="color:rgb(0,0,0)">Cellphone: +49-1525-6841873</div><div style="color:rgb(0,0,0)">Web (Lab): <a href="https://urldefense.com/v3/__https://blogs.urz.uni-halle.de/kastritislab/__;!!Mih3wA!CrYJf8iR8lzAKlzlLYMatgfq2Q6KT3HyN_t3kxVMZXiANDgr0LHslgwzxftwcRObZzYwQkdQ4r5KjjatZw$" target="_blank">https://blogs.urz.uni-halle.de/kastritislab/</a></div><div style="color:rgb(0,0,0)">Web (HALOmem): <a href="https://urldefense.com/v3/__https://www.halomem.de/en/__;!!Mih3wA!CrYJf8iR8lzAKlzlLYMatgfq2Q6KT3HyN_t3kxVMZXiANDgr0LHslgwzxftwcRObZzYwQkdQ4r6fJjYGWw$" target="_blank">https://www.halomem.de/en/</a></div><div style="color:rgb(0,0,0)"><br></div><div style="color:rgb(0,0,0)"><span style="color:rgb(34,34,34)">Achtung: Falls Sie diese E-Mail auf Deutsch erhalten, bedenken Sie bitte, dass sie mit dem Deepl AI Übersetzer übersetzt werden könnte.</span><br></div><div><br></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jan 11, 2023 at 10:43 PM Morgan, David Gene <<a href="mailto:dagmorga@indiana.edu">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"><div class="msg-6160933283769279806">
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<div><span style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0);background-color:rgb(255,255,255)">Hi,</span></div>
<div><span style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0);background-color:rgb(255,255,255)"><br>
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<div><span style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0);background-color:rgb(255,255,255)">Has anyone modified a Pelco glow discharge device so that one can introduce something like amylamine
into the chamber during the glow discharge? I can think of several ways that this could be done, but if someone already has a working model, I would love to chat with them.</span></div>
<div><span style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0);background-color:rgb(255,255,255)"><br>
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<div><span style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0);background-color:rgb(255,255,255)">Thanks in advance.<br>
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