Measurements were made of Cl2 diffusion in crystals which were doped with OH- ions. The diffusion front was detected by observing the blue coloration which was due to electron irradiation or the yellow fluorescence which was due to O2- ions. Solution of the relevant reaction-diffusion equation permitted the evaluation of the diffusion coefficient and of the Henry constant of Cl2. The diffusion results could be described by:

D (m2/s) = 7.1 x 10-2exp[-1.84(eV)/kT]

The temperature dependence of the Henry constant indicated that the dissolution of Cl2 molecules at the surface was an exothermic reaction.

Diffusion of Cl2 Molecules in NaCl and RbCl Crystals Doped with OH- Ions. S.Ezure, T.Ikeda: Journal of the Physical Society of Japan, 1993, 62[9], 3150-6

 

Table 147

Diffusivity of He in RbCl Single Crystals

 

Isotope

Temperature (K)

D (cm2/s)

3He

823

1.12 x 10-4

3He

773

7.69 x 10-5

3He

723

5.48 x 10-5

3He

673

3.54 x 10-5

3He

623

2.27 x 10-5

3He

573

1.15 x 10-5

3He

523

0.65 x 10-5

3He

473

0.20 x 10-5

4He

823

9.48 x 10-5

4He

773

6.52 x 10-5

4He

723

4.80 x 10-5

4He

673

2.91 x 10-5

4He

623

1.99 x 10-5

4He

573

0.96 x 10-5

4He

523

0.62 x 10-5

4He

473

0.17 x 10-5