In the early works of Dayton[1,2], Schram[3] and Jaeckel[4], the hypothesis or the model of theory on the outgassing process of material in the Vacuum was given.

• 真空中材料出气过程曾有Dayton,Schram,Jaeckel分别给出过理论假设和模型,这些理论仍为当前研究出气过程的基本依据。 但是人们早已发现,当测量非晶体材料,例如:塑料、橡胶等的出气过程时,实验与理论之间仍然有矛盾。