Lifetimes and branching ratios of excited states in La{sup -}, Os{sup -}, Lu{sup -}, Lr{sup -}, and Pr{sup -}

Journal Article · Mon Mar 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.032503· OSTI ID:21408410

O'Malley, Steven M; Beck, Donald R ^[1]

---

1. Physics Department, Michigan Technological University, Houghton, Michigan 49931 (United States)

Relativistic configuration-interaction calculations have been performed for all possible E1, M1, and E2 transitions between bound anion states of La{sup -} and Os{sup -}. We pay particular attention to E1 transitions in each case that may be of use in laser cooling of these anions. Although the La{sup -} transition energy is approximately one-third of the Os{sup -} transition, our results indicate that the Einstein A coefficient is nearly two orders of magnitude larger, which would lead to more efficient laser cooling. We have also explored long-lived opposite-parity excited states in Lu{sup -} and Lr{sup -} which are restricted to M2 decay by selection rules. Finally, in Pr{sup -}, we find sufficient mixing between a weakly bound excited 4f{sup 2}5d{sup 2}6s{sup 2} state with a nearby 4f{sup 3}6s{sup 2}6p resonance to result in a lifetime similar to that of the other excited anion states, despite the fact that the dominant configurations of these M1 and E2 transitions differ by two electrons.

• OSTI ID: 21408410
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
BRANCHING RATIO
CHARGED PARTICLES
CONFIGURATION INTERACTION
COOLING
DECAY
DIMENSIONLESS NUMBERS
E1-TRANSITIONS
E2-TRANSITIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FERMIONS
IONS
LASERS
LEPTONS
LIFETIME
MULTIPOLE TRANSITIONS
PARITY
PARTICLE PROPERTIES
RELATIVISTIC RANGE
SELECTION RULES