28 



Fiitling 11 = 4 the said common factoi- deteruiines the density at 

 0,76 =fc 0,01 '). In absence of all fnrther cryslailographical data we 

 have confined onrselves to the qneslion whether sticking- to a NaCI 

 01' ZnS strnctnie an electron grouping conld be found, according to 

 the intensities of the reflections found. 



The table gives the observed and calculated intensities. Only those 

 factors which bring about an abrupt change in the intensity as 

 function of ^ h\ have been taken into account, viz. the factor of 

 the number of |)lanes and the structure factor, in which the influ- 

 ence of the configuration of the electrons too has been accounted 

 for. For this were, tested some approximative suppositions. We have 

 considered the possibilitj that the valency-electron remains near its 

 mother-nucleus (atomic lattice); that the Li has lost its valency- 

 electron to the hydrogen (ion lattice)^); that binding of Li and H 

 takes place by means of rings of electrons revolving round the 

 connecting line in planes normal to the non inlei'secting trigonal 

 axes halfway the Li and H nuclei (binding circles; passing along a 

 trigonal axis two-electron-rings may be imagined between Li and 

 H : molecular lattice, case A ; or one-electron-rings between Li and 

 H as well as between H and Li, case B). 



As to the orbits of the electrons it has been assumed: L that the 

 electrons are so near to their nucleus that they may be supposed 

 to lie in one point (points; reflecting power proportional to the 

 number of electrons); 2. that the connecting line of nucleus and 

 electron is of a definite length o, and is equally occuring in all 

 orientations throughout the part of the crystal that is cooperating 

 in the interference (spheres; diminishing factor for such an electron 



qH 



sin 2jr — 

 a 

 jj-, in which H =z\^ Sli' ^)); and 3. that these connecting 



a 



lines are in planes normal to the non-intersecting trigonal axes, 



all the directions equally occurring in those planes (rings : diminish- 



^ f qH \ 

 mg factor J A'^^i — siny\ in which J^ is the Bessilian-function of 



the order of magnitude and y the angle between orbit and lattice 

 plane*). In the binding circles also only circular orbits have been 



•) Impririties have no influence on this value of the densty, as there is no 

 formation of mixed crystals. 



») Also the less probable case Li-H+ has been considered. 

 s) Gf. KoLKMEYER, These Proc. Vol. XXIII N". 1, p. 120. 

 *) Gf. GosTER, These Proc. Vol. XXII N^. 6, p. 536. 



