Lifetime of the 6s7p1P1 Level of Barium

Abstract

The lifetime of the second excited singlet P level of barium 6s7p1P1 has been determined from the width of the Hanle resonance of the 6s7p1P1–6s21S0 3071.58 Å resonance line. The lifetime is determined to be 13.2 ± 0.4 × 10−9 s. From this lifetime the oscillator strength of the 3072 Å transition is 0.12 ± 0.05 and that of the 6s7p1P1–6s5d1D2 4726 Å is 0.09 ± 0.04.