Rubidium (Rb) in plasma

Rubidium does not draw a ring so much as fill the flask: a soft violet-pink fog with the ring barely resolved inside it, going magenta as the drive comes up and creamy white at the top end. What you see is its violet pair near 420 nm mixed with an orange-red group around 620. The D lines everybody quotes for rubidium sit in the infrared past 780 nm, where neither the eye nor the phone can follow. A few frames catch the metal itself running hot and glowing amber.

Created from pure metallic RB ampoule, dropped inside the flask and crushed there before pumping

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• Rubidium (Rb) glowing plasma discharge, video 14 of 17
• Rubidium (Rb) glowing plasma discharge, video 15 of 17
• Rubidium (Rb) glowing plasma discharge, video 16 of 17
• Rubidium (Rb) glowing plasma discharge, video 17 of 17

Periodic Table of Plasma