The discrepancy between the measured and calculated extended-x-ray-absorption fine structure amplitude in ${\mathrm{Br}}_2$ molecules, the best documented case, is found to be due to an error in the experimental result. New measurements show good agreement with single-particle calculations at low energies near the $K$ absorption edge and a value about 20% below the calculated one at high energies in agreement with the expected multielectron correction to the single-particle calculation.

• Received 8 January 1979

DOI:https://doi.org/10.1103/PhysRevLett.42.1372