Absorption spectrum of Ba i between 1770 and 1560 Å

Abstract

The high-dispersion absorption spectrum of Ba i is reported for the 1770 – 1560 Å region. Observations include transitions from 6s^{2 1}S₀ to the J = 1^o channels with n* ≤ 58 associated with the 6p ²P^o ion core of Ba ii. Autoionization and channel mixing of the observed J = 1^o channels are correlated using methods based on multichannel quantum defect theory.