Physics. — “Remark on the possible. existence of binding rings in 
diamond.” Communication N°. 4 from the Laboratory of 
Physics and Physical Chemistry of the Veterinary College at 
Utrecht. By Dr. N. H. KorkKMEIJER. (Communicated on behalf 
of Prof. W. H. Kersom, Director of the Laboratory, by Prof. 
H. KAMERLINGH ONNES). 
(Communicated at the meeting of January 31, 1920). 
§ 1. Some years ago Drpise and ScHERRER*) investigated, whether 
the assumption of the existence of “binding rings” of 2 electrons each 
between the carbon-‘‘ions” in diamond, was in accordance with the 
intensities of the beams of X-rays, reflected by some planes of the 
lattice as calculated on Braae’s pattern. 
For some time I have doubted however, whether the conclusion 
of DrBije and ScHeRRER, that the mentioned binding rings in diamond 
do not exist, might be regarded as right. In their calculation 
Degije and SCHERRER use an approximating representation, treating 
the two electrons of each binding ring as coinciding in their 
mutual centre of mass. Now I found, that the introduction of this 
simplification may be of great influence on the results obtained. 
These considerations induced me to calculate the relative intensities 
of the lines in the Röntgenogram obtained by the method of DeBije 
and ScHerrer and that without neglecting the real positions of the 
electrons in the binding rings. The comparison of these calculations 
with the observed intensities might give the solution of the question, 
whether these intensities are in agreement with the assumption of 
the binding rings. Eventually it might also enable us to deduce the 
radius of the binding rings. Proceeding in this way I found that 
without making new assumptions the conclusion of DeBĲE and 
ScHERRER must be accepted. At the same time however I got the 
impression, that the observations at our disposition on diamond only 
do not permit the drawing of a definite conclusion. This is evident, 
as the reflection of the X-rays is effected not only by the eventual 
binding electrons, but also by the electrons circulating about the 
nucleus (and perhaps even more or less by the eventual electrons 
1) P. Degise and P. Scuerrer, Physik. ZS. 19 (1918) p. 476. 
