Dielectronic satellites of the He_β line of the Si XIII ion in a dense laser plasma

The first precision measurements of the wavelengths and identifications were made of the satellites of the He_β line of the Si XIII ion in the emission spectrum of a laser plasma. These satellites were the result of radiation decay of the 1s3l₁2l₂ levels of the Si XII ion. The wavelengths were determined more accurately for the 1s3l₁3l₂ configurations. The experimental results obtained were compared with calculations carried out by various methods. The structure of the relative intensities of the 1s3l₁3l₂ satellites indicated that their emission occurred mainly in a thin overdense plasma region with N_e > N^cr_e.