Stjepan Mohorovičić

Who was Stjepan Mohorovičić?

Stjepan Mohorovičić was a Croatian scientist born in the town of Bakar and died in the city of Zagreb, Croatia. His father is the world-famous geophysicist Andrija Mohorovičić.

Stjepan Mohorovičić is often called "the father of positronium" because his most significant work is the prediction of the existence of positronium. Positronium is the bound state of an electron and a positron and therefore the lightest atom. Mohorovičić's prediction of positronium was published in 1934 in the prominent German scientific journal Astronomische Nachrichten, where it was called "electrum". It was experimentally discovered by Martin Deutsch in 1951 and became known as positronium.