Quantum Dynamics of Helium Clusters
Abstract
Our study of helium clusters was motivated by the desire to understand the scaling of the unusual properties of bulk (Helium 4), a quantum liquid, in finite size systems as one goes from the macroscopic regime to the regime of molecular dimensions. This is fully in the spirit of general cluster research, namely to develop our understanding of how the transition from molecular to bulk systems (or vice versa) is reflected in the internal structure and dynamics of finite size aggregates. The unique feature of helium is its dominant quantum behavior, resulting from a low mass and weak interatomic binding energy. Clusters of helium are therefore very weakly bound van der Waals species, whose properties are expected to be dominated by zero point delocalization effects. During this grant period, we devoted our attention exclusively to clusters of (Helium 4), which are Bose systems. These are more strongly bound than the fermionic species (Helium 3) sub N, and are also easier and cheaper to study experimentally. Furthermore, analogy with the bulk behavior suggests that any superfluid effects, if present, will occur at considerably higher and therefore more experimentally accessible temperatures for (Helium 4) sub N.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1992
- Accession Number
- ADA245752
Entities
People
- K. B. Whaley
Organizations
- University of California, Berkeley