Abstract
Ultraviolet and visible absorption spectra of solids in KCl pellet prepared with an extremely vigorous grinding by hand and by a vibrator often showed a remarkable difference from those in the pellet prepared after a mere mixing by hand.
Compounds lacking polar groups in them did not give such a difference of the spectrum between both pellets, and the distortion of spectra in compounds with only weak hydrogen bondings was removed by heating the pellet. In compounds in which the types of the hydrogen bondings are complicated, however, the distortion of spectra could not be removed by heating.
