Erwin Wilhelm Müller, German physicist and academic (died 1977)

Erwin Wilhelm Müller was a German physicist who invented the Field Emission Electron Microscope (FEEM), the Field Ion Microscope (FIM), and the Atom-Probe Field Ion Microscope. He and his student, Kanwar Bahadur, were the first people to experimentally observe atoms.

June 13 is the 164th day of the year in the Gregorian calendar; 201 days remain until the end of the year.