Shape resonances in molecular fields
A shape resonance is a quasibound state in which a particle is temporarily trapped by a potential barrier (i.e., the shape of the potential), through which it may eventually tunnel and escape. This simple mechanism plays a prominent role in a variety of excitation processes in molecules, ranging from vibrational excitation by slow electrons to ionization of deep core levels by x-rays. Moreover, their localized nature makes shape resonances a unifying link between otherwise dissimilar circumstances. One example is the close connection between shape resonances in electron-molecule scattering and in molecular photoionization. Another is the frequent persistence of free-molecule shape resonant behavior upon adsorption on a surface or condensation into a molecular solid. The main focus of this article is a discussion of the basic properties of shape resonances in molecular fields, illustrated by the more transparent examples studied over the last ten years. Other aspects to be discussed are vibrational effects of shape resonances, connections between shape resonances in different physical settings, and examples of shape resonant behavior in more complex cases, which form current challenges in this field.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE; US Department of the Navy, Office of Naval Research (ONR)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5142262
- Report Number(s):
- CONF-840415-18; ON: DE84009206
- Resource Relation:
- Conference: 187. national meeting of the American Chemical Society, St. Louis, MO, USA, 8 Apr 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MOLECULAR MODELS
RESONANCE SCATTERING
ELECTRIC POTENTIAL
ELECTRON-MOLECULE COLLISIONS
EXCITATION
PHOTON-MOLECULE COLLISIONS
VIBRATIONAL STATES
COLLISIONS
ELECTRON COLLISIONS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
INELASTIC SCATTERING
MATHEMATICAL MODELS
MOLECULE COLLISIONS
PHOTON COLLISIONS
SCATTERING
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena