> I see.. That taking a known volume could really work. But it is difficult to > use it directly in the tube (capillary with both ends open and a drop of > mercury), the mercury would evaporate during pumping messing the vacuum > system with vapours of mercury.. not good.
What you do is make a mercury trap. Heat a spot of your narrow tubulation tubing and blow a bubble in it. Tip the drop of mercury into the bubble and seal that tube to your vacuum system and the tube you're evacuating. Now arrange to have the bubble sitting in a little cup of acetone cooled by dry ice. The mercury will freeze, greatly lowering its vapor pressure. After pumping, let the mercury re-melt, seal off the tube from your vacuum system, tip the droplet from the bubble into your tube, and then do the final seal-off of your tube. Voilà! - John -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/A5BB453E-F908-46C4-ABF9-A6E929D9B05F%40mac.com. For more options, visit https://groups.google.com/groups/opt_out.
