1984/12/01 by Roy D. Mead, Keith R. Lykke, W. C. Lineberger +2 · 3 citations
Physics and Astronomy · Chemistry · #Advanced Chemical Physics Studies #Molecular Spectroscopy and Structure #Spectroscopy and Quantum Chemical Studies #Dipole #Atomic physics #Chemistry #Excited state #Rydberg formula #Spectroscopy #Ground state #Bound state #Electric dipole transition #Ion #Excitation #Magnetic dipole #Physics #Ionization #Quantum mechanics
paper · doi:10.1063/1.447515
openalex publication_date 1984/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Ultrahigh-resolution photodetachment spectroscopy of acetaldehyde enolate negative ion has revealed ∼50 narrow resonances near threshold, corresponding to excitation to a diffuse state in which the electron is weakly bound by the field of the molecular dipole. A complete analysis of rotational transitions between the ground valence state and the excited dipole-bound state has been carried out, yielding spectroscopic constants and geometries for both states. In analogy to Rydberg states, the structure of the ‘‘neutral core’’ of the dipole-bound state is like that of the neutral radical. The dependence of autodetachment lifetimes upon the rotational quantum numbers of the dipole-bound state has been measured. Bound levels of the dipole-bound anion state are readily electric-field detached. The selection rules and dynamics of autodetachment from the dipole-bound state are discussed.