ABSTRACT
If J is the total angular momentum of a system, the operator () https://www.w3.org/1998/Math/MathML"> R α = e – iJ ⋅ α , https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429499265/ff9ae276-bf0f-4700-9154-eaa3ea82fbc6/content/eq2056.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
