New odd-parity energy levels of europium atoms in the 43 200-45 000 cm(-1)region by laser photoionization spectroscopy

Odd-parity energy levels of europium atoms (Eu I) have been investigated by employing single-colour and two-colour stepwise resonance ionization spect roscopy techniques with a heat-pipe oven for metal vapour containment and a thermionic diode for ion detection. Eighty-two new odd-parity energy level s of Eu I have been found in the energy region 43 200-45 000 cm(-1). The J quantum numbers for all these newly discovered energy levels have been uniq uely assigned. In addition to this, some of the energy levels previously re ported by us and assigned more than one J quantum number have been re-inves tigated and unique J quantum numbers for these levels have been determined.