L1-L2,3M Coster-Kronig transitions in argon

The L1-L2,3M Coster-Kronig spectrum of argon has been measured by using photon excitation. The intensity ratio of 0.30±0.02 between the L1-L2,3M1 main lines and the L1-L2,3M2,3 lines is extracted from experiment. The experimental results for the ratio and partial decay rates are compared with present and previous theoretical estimates.