Absolute isotopic abundance ratios and the atomic weight of a reference sample of silicon

Abstract

Ab solute va lu es have been obtained for th e isotopic a bund a nce rati os of a re fe re nce sa mpl e of s ilico n us ing e lec tron impa ct mass s pectrom etry.Sa mpl es of known isoto pi c co mpos it ion pre pared fro m nearly isotop ica lly pure se pa rated sili co n isotopes we re used to ca librate th e ma ss s pectrom e te rs.The res ult ing absolute ,sS i/,JOS i ratio = 29.74320± 0.00747 and th e 29S i/,,°S i ratio = 1.50598 ± 0.00086 whi c h yield at om pe rcen ts of '"S i = 92.229:n .0.00155." 'Si =,1.()6982I 0.00124 and :lIISi = :).10085 I 0.00074.The atomic weight ca lc ulated from thi s isotopic co mpos ition is 28.085526 • 0.000056.Th e indi cated un ce rtainti es are overall limit s of e rror based o n 95 perce nt confidence limit s for th e mea ns a nd a ll owan ces for th e effec ts of kn ow n sources of poss ibl e s yste ma tic e rror.A study of natura l '"S i/,IIIS i rati o variations re ported in th e literature e xtend s tb e es timat ed un ce rt a int y in th e atomic we ight of natural s ili co n to ' 0.000.39.

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