This was the first time humans saw atoms some 2,400 years after Leucippus and Democritus postulated the existence of the "undividable"particle. (a) (b Helium in Professor Erwin W.Muller To pump (1911-1977) W Figure 1.10 The field-ion microscope was the first successful attempt to image'atoms':(a)A schematic diagram of the instrument;(b)a tungsten tip imaged by field-ion microscopy. 55 Professor Erwin W. Müller (1911–1977) This was the first time humans saw atoms some 2,400 years after Leucippus and Democritus postulated the existence of the “undividable” particle