title: The 480 nm system of KRb: 1 3Delta1, 4 1Sigma+, and 5 1Sigma+ states.
abstract: We have investigated the KRb 480 nm system by mass-resolved resonance enhanced two-photon ionization in a cold molecular beam. The 1 (3)Delta(1), 4 (1)Sigma(+), and 5 (1)Sigma(+) <-- X (1)Sigma(+) transitions have been identified. For the 1 (3)Delta(1) and 5 (1)Sigma(+) states, the electronic term values and vibrational constants are determined experimentally for the first time. Potential energy curves of the 4 (1)Sigma(+) and 5 (1)Sigma(+) states undergo multiple avoided crossings with nearby (1)Sigma(+) states in the observed spectral region. For the 4 (1)Sigma(+) state, a vibrational numbering of the experimentally observed levels is suggested. Anomalies in vibronic structures of the 4 (1)Sigma(+) and 5 (1)Sigma(+) states are understood by comparison with high-level ab initio calculations currently available. The avoided crossing energies are also experimentally estimated.
authors.affiliation: Department of Chemistry, Mokpo National University, Jeonnam 534-729, Korea.
authors.forename: Yonghoon
authors.initials: Y
authors.lastname: Lee
authors.forename: Youngjee
authors.initials: Y
authors.lastname: Yoon
authors.forename: Adnan
authors.initials: A
authors.lastname: Muhammad
authors.forename: Jin-Tae
authors.initials: JT
authors.lastname: Kim
authors.forename: Sungyul
authors.initials: S
authors.lastname: Lee
authors.forename: Bongsoo
authors.initials: B
authors.lastname: Kim