Glowing <a href="https://en.wikipedia.org/wiki/Noble_gas" class="extiw" title="en:Noble gas">noble gases</a> in glass vials with low pressure inside. Power supply: 5 kV, 20 mA, 25 kHz.
New work <a href="//commons.wikimedia.org/wiki/User:Alchemist-hp" title="User:Alchemist-hp">Alchemist-hp</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Alchemist-hp" title="User talk:Alchemist-hp"><span class="signature-talk">talk</span></a>) <a rel="nofollow" class="external text" href="http://www.pse-mendelejew.de">www.pse-mendelejew.de</a>); original single images: <a href="//commons.wikimedia.org/wiki/User:Jurii" title="User:Jurii">Jurii</a>, <a rel="nofollow" class="external text" href="http://images-of-elements.com">http://images-of-elements.com</a>.
CC BY 3.0
Original: <a href="//commons.wikimedia.org/wiki/User:Jurii" title="User:Jurii">Jurii</a>: <a href="//commons.wikimedia.org/wiki/File:Helium-glow.jpg" class="image" title="helium"><img alt="helium" src="https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Helium-glow.jpg/80px-Helium-glow.jpg" decoding="async" width="80" height="80" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Helium-glow.jpg/120px-Helium-glow.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Helium-glow.jpg/160px-Helium-glow.jpg 2x" data-file-width="1092" data-file-height="1092"></a> <a href="//commons.wikimedia.org/wiki/File:Neon-glow.jpg" class="image" title="neon"><img alt="neon" src="https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Neon-glow.jpg/80px-Neon-glow.jpg" decoding="async" width="80" height="80" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Neon-glow.jpg/120px-Neon-glow.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Neon-glow.jpg/160px-Neon-glow.jpg 2x" data-file-width="1216" data-file-height="1216"></a> <a href="//commons.wikimedia.org/wiki/File:Argon-glow.jpg" class="image" title="Argon"><img alt="Argon" src="https://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Argon-glow.jpg/80px-Argon-glow.jpg" decoding="async" width="80" height="80" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Argon-glow.jpg/120px-Argon-glow.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Argon-glow.jpg/160px-Argon-glow.jpg 2x" data-file-width="968" data-file-height="968"></a> <a href="//commons.wikimedia.org/wiki/File:Krypton-glow.jpg" class="image" title="krypton"><img alt="krypton" src="https://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Krypton-glow.jpg/80px-Krypton-glow.jpg" decoding="async" width="80" height="80" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Krypton-glow.jpg/120px-Krypton-glow.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Krypton-glow.jpg/160px-Krypton-glow.jpg 2x" data-file-width="1016" data-file-height="1016"></a> <a href="//commons.wikimedia.org/wiki/File:Xenon-glow.jpg" class="image" title="xenon"><img alt="xenon" src="https://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Xenon-glow.jpg/80px-Xenon-glow.jpg" decoding="async" width="80" height="80" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Xenon-glow.jpg/120px-Xenon-glow.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Xenon-glow.jpg/160px-Xenon-glow.jpg 2x" data-file-width="1140" data-file-height="1140"></a>