Low pressure ampoules of Hydrogen, Nitrogen, Oxygen and five of the noble gases

 Low pressure ampoules of Hydrogen, Nitrogen, Oxygen and five of the noble gases

10x40mm ampoule, borosilicate glass.

I managed to get these ampoules from an American site some time ago. Because of lowered pressure inside of them, compared to atmospheric, the gases should be able to glow when subjected to passage of free electrons inside.

I haven't been able to test that yet, probably due to my cheap tesla coil being barely able to excite a neon indicator bulb. I can't however exclude the possibility of these ampoules being produced incorectly (e.g. with too high of a pressure inside), as from what I heard, that had been the case with some purchased by other people.

Most of these gases should be able to glow in different colors in the colder gray - sky blue - violet spectrum, with the main outstander being already mentioned neon that glows with a beautiful warm orange color. Helium has also been observed to glow with similiar color, but the whole thing seems subjective.

One of the noble gases that hasn't been made into such ampoules is radon (Rn). Isotopes of radon however, are among the daughter isotopes of natural uranium and thorium, so a symbolic sample can be prepared through sealing a source containing these elements. Unfortunately, it won't glow at all.