polyethylenewindows.Mössbauerspectrawere obtainedasdescribed previously/13/.Theelemental analyses wereperformedby theCNRS"ServiceCentrald'Analyses",Vemaison, France.Infrareddataaregivenincm"1(abbreviations: (vs) verystrong,(s)strong,(m)medium, (sh) shoulder,(w)weak). Mössbauer parametersaregivenin...