▁w avel ength , ▁which ▁in ▁turn ▁makes ▁it ▁possible ▁to ▁vary ▁the ▁scatter ing ▁factor ▁for ▁one ▁particular ▁element ▁in ▁the ▁sample ▁under ▁investigation . ▁Thus ▁a ▁particular ▁element ▁can ▁be ▁highlight ed . ▁This ▁is ▁known ▁as ▁contrast ▁variation . ▁In ▁addition ▁to ▁this ▁effect ▁the ▁anom alous ▁scatter ▁is ▁more ▁sensitive ▁to ▁any ▁deviation ▁from ▁spher icity ▁of ▁the ▁electron ▁cloud ▁around ▁the ▁atom . ▁This ▁can ▁lead ▁to ▁reson ant ▁effects ▁involving ▁trans itions ▁in ▁the ▁outer ▁shell ▁of ▁the ▁atom : ▁reson ant ▁anom alous ▁X - ray ▁scatter ing . ▁ ▁References ▁ ▁Category : S cient ific ▁techniques ▁Category : C ry stal log raph y ▁Category : X - ray s <0x0A> </s> ▁The ▁ 2 0 1 8 ▁American ▁sal mon ella ▁out break ▁was ▁an ▁American ▁dis aster ▁in ▁which ▁over ▁ 2 5 0 ▁people ▁were ▁sick ened ▁by ▁ch icken ▁sal ad ▁cont amin ated ▁with ▁sal mon ella . ▁Other ▁out break s ▁were ▁confirmed ▁with ▁tur key ▁identified ▁as ▁the ▁cause . ▁ ▁Tim eline ▁ ▁The ▁ch icken ▁sal ad ▁was ▁made ▁by ▁an ▁Iowa - based ▁food ▁processing ▁company ▁Tri ple ▁T ▁Special ty ▁Me ats ▁and ▁distributed ▁in ▁F are way ▁super market . ▁ ▁One ▁person ▁in ▁Iowa ▁died , ▁and ▁more ▁than ▁ 9 0 ▁others ▁were ▁hospital ized . ▁At ▁least ▁ 4 8 ▁law su its ▁have ▁been ▁file d ▁against ▁Tri ple - T ▁and ▁F are way ▁from ▁out break