Hα
Hydrogen's single electron can exist at six possible energy quanta. When one falls from the 3rd to the 2nd principal quantum number, a stunning 656nm red is created, this emission know as Hydrogen Alpha or Hα.
Above is a capillary filled with low pressure hydrogen gas driven into a plasma state using 7,500 volts to produce Hα red.
Compositionally Challenged, Week 34 - The Color Red
Hα
Hydrogen's single electron can exist at six possible energy quanta. When one falls from the 3rd to the 2nd principal quantum number, a stunning 656nm red is created, this emission know as Hydrogen Alpha or Hα.
Above is a capillary filled with low pressure hydrogen gas driven into a plasma state using 7,500 volts to produce Hα red.
Compositionally Challenged, Week 34 - The Color Red