Krypton Spectrum in the Wavelength Range 3450–3900 Å

Using a high-efficiency, high-resolution transmission grating spectrometer, we measured krypton spectra over the wavelength range 3450–3900 A in the low-energy electron beam ion trap EBIT-II at Lawrence Livermore National Laboratory. In total, we analyzed 78 line features, of which only about 20 lines are listed in standard databases. Their wavelengths were determined with accuracy of 0.2–0.5 A. Different widths of lines from near-neutral and highly-ionized krypton atoms are attributed to ion motion and to the radial extent of the trapped-ion cloud.