Abstract
New experimental facts about diamond, supported by X-ray photographs, are as follows: There are two kinds of extra reflexions to be seen on wellexposed Laue photographs. All diamonds show
primary
diffuse reflexions, which are temperature-sensitive but not structure-sensitive. These correspond to the diffuse reflexions observed under suitable conditions for all other substances. Type I diamonds, only, show the
secondary
reflexions (sharp spots, streaks and groups of spots) which have been previously described and which are not at all typical of diffuse spots in general. They are not really diffuse, they are not (or only slightly) temperature-sensitive and they are strongly structure-sensitive.
Primary
and
secondary
reflexions have been observed for many diamonds and in various orientations, associated with the {111} {220} {113} {331} Laue reflexions, using filtered and unfiltered radiation from copper andiron targets. There is as yet no explanation of the
secondary
reflexions which can account satisfactorily for the structure - sensitiveness, the presence of {220} spots, and the apparent incompleteness of the groups of spots actually observed.
Reference4 articles.
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3. Two types of diamond
4. Proc. Roy;Robertson Fox;Soc. A,1936
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