Magnetic-dipole transitions in tungsten and other heavy elements observed with the NIST EBIT

Abstract

We describe recent observations with the electron beam ion trap (EBIT) at the National Institute of Standards and Technology (NIST) in which we observed large numbers of magnetic dipole (M1) transitions within the 3dn ground configurations of the highly-ionized heavy metals Hf, Ta, W, and Au. The data are interpreted by means of collisional-radiative modeling of the EBIT plasma.