the solar spectrum recorded using modern instruments
At the age of 27, Antoine Becquerel (1) left the army and began a career in science. In 1829 he constructed the first electrochemical cell producing a stable electric current.
His research also included phosphorescence — the delayed release of visible photons of light after radiation (visible or ultraviolet) has excited the atoms and electrons in a material (2). It is the process behind glow-in-thedark pigments (3).
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