﻿MAY 
  19, 
  1922 
  POSNJAK 
  AND 
  WYCKOFF: 
  AL,KALI 
  HALIDES 
  

  

  249 
  

  

  I^ITHIUM 
  IODIDE 
  

  

  Considerable 
  difficulty 
  was 
  experienced 
  in 
  preparing 
  anhydrous 
  

   Lil. 
  The 
  salt 
  which 
  was 
  finally 
  used 
  was 
  fused 
  in 
  an 
  atmosphere 
  of 
  

   hydrogen 
  and, 
  immediately 
  upon 
  solidification, 
  was 
  powdered 
  and 
  

   enclosed 
  in 
  a 
  capillary 
  glass 
  tube. 
  A 
  couple 
  of 
  faint 
  lines 
  which 
  

   were 
  found 
  upon 
  the 
  photographs, 
  but 
  which 
  could 
  not 
  be 
  associated 
  

   with 
  Lil 
  are 
  undoubtedly 
  due 
  to 
  hydration 
  or 
  decomposition 
  prod- 
  

   ucts 
  of 
  this 
  salt. 
  The 
  agreement 
  between 
  the 
  estimated 
  intensities 
  

   and 
  those 
  calculated 
  from 
  the 
  commonly 
  employed 
  assumptions 
  is 
  

   not 
  so 
  good 
  as 
  usual. 
  

  

  RUBIDIUM 
  FLUORIDE 
  

  

  The 
  diffraction 
  effects 
  observed 
  upon 
  photographs 
  from 
  four 
  dif- 
  

   ferent 
  preparations 
  of 
  RbF 
  were 
  essentially 
  the 
  same. 
  They 
  are, 
  

  

  