Renner-Teller interactions in the acetylene molecule

The First Excited Ca–C–C Bending Vibration Levels in theÃ2Π andX2Σ+States of the CaCCH Radical: The Renner–Teller Effect andK-type Resonance

“…More extensive data in-C-C bending modes in the X state. In 1990, Whitham et al volving C 2 H 2 and its isotopomers were recorded later with (12) observed the CaCCH Ã -X transition in a laser ablation/ high resolution in the region 1205 -1255 Å by Colin and supersonic expansion apparatus; taking advantage of the low co-workers ( 4,5 ) ; using the formulas in Ref.…”

Perturbative Handling of the Renner–Teller Effect and Spin–Orbit Coupling in Π Electronic States of Triatomic and Tetra-atomic Molecules

“…The perturbative formulae have been widely employed in previous experimental studies (see, e.g., Refs. (31)(32)(33)(34)(35)(36)) and will certainly be used in future, at least for species with linear equilibrium geometry.…”

The acetylene ground state saga

“…Indeed, acetylene became over the years a privileged ground to build theoretical concepts and develop very high-performance including a number of reviews [8,3,9], giving birth to the ''acetylene saga'' and Renner-Teller effects in various acetylene isotopologues [10,11].…”