Adsorbents (I)

Absorbents (II)

Reactants (III)

Kinetics

Kinetics

Kinetics

, where k₁ and k₂ are constants [28] [29] .

, if the process is limited by the dissociation of molecules;

, if the process is limited by the transition;

, if the process is limited by the diffusion of atoms of X in [X]_s.

Here K is an equilibrium constant, p is vapor pressure of gas X₂ above the getter, k₃, k₄ and k′ are coefficients, [X]_s is solid solution of gas X in metal [18] .

Q = k₅(t^1/2), or Q = k₆t depending on the nature of the metal. Here k₅ and k₆ are rate constants [16] - [18]