Which Scientific discovery resulted in the solid atom theory being adapted into the Plum Pudding model of the atom?

After discovering the electron in 1897, J J Thomson proposed that the atom looked like a plum pudding . To explain the two types of static electricity, he suggested that the atom consisted of positive 'dough' with a lot of negative electrons stuck in it.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa