• DOI:10.1103/PhysRevA.91.012503
• Corpus ID: 118444318

Bound and resonance states of the dipolar anion of hydrogen cyanide: Competition between threshold effects and rotation in an open quantum system

@article{Fossez2014BoundAR,
  title={Bound and resonance states of the dipolar anion of hydrogen cyanide: Competition between threshold effects and rotation in an open quantum system},
  author={K. Fossez and Nicolas Michel and Witold Nazarewicz and M. Płoszajczak and Y. Jaganathen},
  journal={Physical Review A},
  year={2014},
  volume={91},
  pages={012503}
}

• K. Fossez, N. Michel, +2 authors Y. Jaganathen
• Published 24 October 2014
• Physics
• Physical Review A

Bound and resonance states of the dipole-bound anion of hydrogen cyanide HCN- are studied
using a non-adiabatic pseudopotential method and the Berggren expansion technique involving
bound states, decaying resonant states, and non-resonant scattering continuum. We devise an
algorithm to identify the resonant states in the complex energy plane. To characterize spatial
distributions of electronic wave functions, we introduce the body-fixed density and use it to assign
families of resonant states into collective rotational bands. We find that the non-adiabatic coupling
of electronic motion to molecular rotation results in a transition from the strong-coupling to weak-
coupling regime. In the strong coupling limit, the electron moving in a subthreshold, spatially
extended halo state follows the rotational motion of the molecule. Above the ionization threshold,
electron's motion in a resonance state becomes largely decoupled from molecular rotation. Widths
of resonance-band members depend primarily on the electron orbital angular momentum.