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

Journal Article · · Physical Review A - Atomic, Molecular, and Optical Physics
 [1];  [1];  [2];  [1];  [3]
  1. Grand Accelerateur National d'Ions Lourds (Large Heavy Ion National Accelerator) (GANIL), Caen (France). National Center for Scientific Research (CNRS). Alternative Energies and Atomic Energy Commission (CEA)
  2. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy. NSCL/FRIB Lab.; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division; Univ. of Warsaw (Poland). Inst. of Theoretical Physics
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Michigan State Univ., East Lansing, MI (United States). NSCL/FRIB Lab.
+ Show Author Affiliations
In this paper, bound and resonance states of the dipole-bound anion of hydrogen cyanide HCN– are studied using a nonadiabatic pseudopotential method and the Berggren expansion technique involving bound states, decaying resonant states, and nonresonant 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 nonadiabatic 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, the electron's motion in a resonance state becomes largely decoupled from molecular rotation. Finally, the widths of resonance-band members depend primarily on the electron orbital angular momentum.
Research Organization:
Grand Accelerateur National d'Ions Lourds (Large Heavy Ion National Accelerator) (GANIL), Caen (France); Michigan State Univ., East Lansing, MI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
French-U.S. Theory Inst. for Physics with Exotic Nuclei (FUSTIPEN) (United States); USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Organization:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Warsaw (Poland)
Grant/Contract Number:
FG02-96ER40963
OSTI ID:
1337827
Alternate ID(s):
OSTI ID: 1181360
Journal Information:
Physical Review A - Atomic, Molecular, and Optical Physics, Journal Name: Physical Review A - Atomic, Molecular, and Optical Physics Journal Issue: 1 Vol. 91; ISSN 1050-2947
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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