Wing K. Kot

The 5f→6d absorption spectrum of Pa4+/Cs2ZrCl6

The 5f1→6d1 absorption spectrum of 231Pa4+ diluted in a single crystal of Cs2ZrCl6 has been measured at 4.2 K. Three bands corresponding to the 6d(Γ8g, Γ7g, and Γ’8g ) levels are assigned. Extensive vibronic structure has been observed for the lowest 5f→6d transition and this structure is compared to that recently reported for the 6d1→5f1 emission spectra in the same system.

Spectroscopic and magnetic studies of tetravalent Pa and trivalent Th compounds

Abstract At the beginning of the actinide series, the 5f and 6d configurations are very close in energy. Consequently, both the 5f and 6d energy level splittings may be observed experimentally in Pa 4+ and Th 3+ compounds. The available magnetic and optical data on these systems are reviewed.