Polarization of the KαL1 x-ray satellite in copper after 2 MeV proton impact

The KαL1 satellite spectrum of 29Cu was measured with a 5 inch Johansson crystal spectrometer after 2 MeV proton impact. The satellite spectrum was simulated by using Voigt profiles with a Lorentzian width which is obtained from the multiconfiguration Dirac–Fock (MCDF) calculations and convoluted with the Gaussian instrumental response function. A unique assignment of the strongest satellite transitions to visible structures in the experimental spectrum was based on a comparison of the predicted linear polarization of the transitions (using in calculations the intermediate coupling scheme) to their measured values. The simulated spectrum of the satellite transitions was fitted to the experiment. The fitted values of energies and relative intensities of the transitions are close to those obtained from the MCDF calculations. The alignment of the (1s2p)−2 double-vacancy state obtained from the measured polarization of the satellite spectrum is given by 20(1P 1) = −0.77(21) and 20 (3P) = −0.53(10) (values are not corrected for the Coster–Kronig transition). This is in agreement with the value reported for the KαL1 peak of Al.