Observation and Analysis of Resonant Coupling Between Near-Degenerate Levels of the 2 1Σg+ and 1 1 Πg States of Ultracold 85Rb2

Abstract

We report on the anomalously high line strength of a single rotational level in the ultracold photoassociation of two 85Rb atoms to form 85Rb2. The v' = 111, J' = 5 level belongs to the Hund's case (c) 2 (0g+) state, which correlates to the Hund's case (a) 2 1 Σg+ state. Its strength is caused by coupling with a very near-resonant long-range state. The long-range component is the energetically degenerate v' = 155, J' = 5 level of the case (c) 2 (1g)$ state, correlating to the case (a) 1 1 Πg state. The line strength is enhanced by an order of magnitude through this coupling, relative to nearby vibrational levels and even to nearby rotational levels of the same vibrational level. This enhancement is in addition to the enhancement seen in all J' = 3 and 5 levels of the 2 (0g+) state due to an l = 4 shape resonance in the a 3 Σu+ state continuum, which alters the distribution of levels formed by photoassociation.

arXiv comment6 pages, 4 figures

References in corpus (8)

• Formation of ultracold polar molecules in the rovibrational ground state
• Ultracold Molecules in the Ro-Vibrational Triplet Ground State
• Hyperfine, rotational, and vibrational structure of the triplet ground state of Rb molecules
• Direct Photoassociative Formation of Ultracold KRb Molecules in the Lowest Vibrational Levels of the Ground State
• Resonant Coupling in the Heteronuclear Alkali Dimers for Direct Photoassociative Formation of X(0,0) Ultracold Molecules
• Enhancement of the formation of ultracold ${}^{85}$Rb${}_2$ molecules due to resonant coupling
• Formation of ultracold RbCs molecules by photoassociation
• Photoassociation to the 2(1)Sigma(g)(+) state in ultracold 85Rb2 in the presence of a shape resonance

Cited by in corpus (1)

• Short-range photoassociation from the inner wall of the lowest triplet potential of ${}^{85}$Rb${}_2$