Origin of the extrareflections of the “spine” type in laue photograph of natural diamonds

Effects of platelets on the absorption and luminescence-excitation spectra of natural diamonds

“…* This follows from a study [8] of the parallel trend in the strength of these extra reflections and the UV absorption. We have shown [1,2] that ~trogen Which produces the A bands in the IR (strongest band 1282 em -1) and the UV absorption below 3000 A has no relation to the extra reflections, and hence to the platelets; it is present in some other form, perhaps as N 2 groups.~ The nature of the platelets thus remains open.…”

“…We have shown [1,2] that the extra reflections of thorn shape in Laue patterns are quantitatively related to the 1365 cm -~ IR band. It has now been found that these reflections for natural diamonds are due to platelets parallel to the cube faces, whose existence was predicted theoretically in a discussion of the nature of the reflections [3].…”

“…luminescence excitation spectrum for natural diamonds, on the basis of the correlation of the extra reflections with the 1365 cm -~ IR band [1,2]. The specimens were transparent or semitransparent colorless or yellowish octahedra from a deposit in Yakutia; they weighed from 0.03 to 1 carat.…”