May be it's due to a gas mixture. Don't forget there is also a bit of mercury in the tube the also has some green in the spectrum. However, the color reminds me more the color that will be seen by burning copper-salts. The color on the photo is not reliable, so it's only a guess...
eric -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Rehwinkel Sent: maandag 13 januari 2014 20:39 To: [email protected] Subject: Re: [neonixie-l] Re: Green glow in gas > OK, here's a pic of the mysterious green glow I sometimes see in my 5092 nixie tube. It's towards the rear of the tube. Oh, that's nifty! I hadn't seen that effect before. > Krypton has some green spectral lines, so maybe this tube has trace-amounts of Kr-86 to reduce ionization time. But after 50 years I would expect all of it would be gone considering it has a 10-year half-life. I seriously doubt it's from krypton - while there are green lines, there are a lot of other lines as well, which normally dominate. I don't think it's bulb fluorescence either, as the mean free path of an electron in neon of that pressure is too short, and there's not enough voltage available anyway. Which leaves the mystery of what it really is. A spectroscope would shed some light (pun intended) on it. I'm guessing it's some trace metal that deposited there and gets ionized. Maybe a bit of getter material, or some insulation decomposed? - 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/1BD38202-F796-4420-A520-8B93036 F3DC7%40mac.com. For more options, visit https://groups.google.com/groups/opt_out. -- 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/!%26!AAAAAAAAAAAYAAAAAAAAAPDddShx705MuX20yCpp0vvCgAAAEAAAAME/dMpSgfRKu7qENUH9KLYBAAAAAA%3D%3D%40zeelandnet.nl. For more options, visit https://groups.google.com/groups/opt_out.
