6533b873fe1ef96bd12d55a5
RESEARCH PRODUCT
Energy and entropy barriers of two-level systems in argon clusters: An energy landscape approach
O. PillaGabriele VilianiClaudio Brangiansubject
Maxima and minimaTunnel effectArgonchemistryGeneral Chemical EngineeringSaddle pointGeneral Physics and Astronomychemistry.chemical_elementEnergy landscapeStatistical physicsAtomic physicsGround statedescription
Abstract Free argon clusters containing up to 160 atoms have been studied by means of a numerical algorithm for finding thousands of adjacent minima connected through a first-order saddle point. Many minimum-saddle-minimum systems have been found to be good candidates for forming two-level systems. The ground state splitting has been evaluated by taking into account both energy and entropy barriers. The role of the latter in auenching or enhancing the ground state splitting is discussed with the aid of a simple model potential.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-11-01 | Philosophical Magazine B |