Radiative lifetimes of the NaRb C(3)1Σ+ state: experiment and theory
Department of Physics and Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, 1586, Latvia
2 Department of Chemistry, Moscow State University, Moscow, 119899, Russia
Corresponding author: a email@example.com
Published online: 7 June 2006
Radiative lifetimes for 2≤v′≤44 rovibronic C1Σ+ state levels of NaRb and quenching collision cross-sections with Rb atoms have been directly measured in a thermal cell by detecting time resolved laser induced fluorescence after pulsed excitation. Many body multipartitioning theory was applied to calculate C1Σ+-X1Σ+ and C1Σ+-A1Σ+ transition dipole moments. The relevant ab initio matrix elements were converted to the C1Σ+ state radiative lifetimes. The strong spin-orbit A1Σ+∼ b3Π coupling effect on the total C → A transition probabilities and lifetimes of the C1Σ+ state is discussed. The measured radiative lifetimes show a decrease from 61 to 34 ns as the v′ values increase, the results being in good agreement with calculations. The averaged collisional quenching cross-section value σ=(3±1)×10-14 cm2 was determined for NaRb (C1Σ+) + Rb collisions from the Stern-Volmer plots.
PACS: 33.70.Ca – Oscillator and band strengths, lifetimes, transition moments, and Franck-Condon factors / 33.50.Hv – Radiationless transitions, quenching
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006