Tunneling of atoms, nuclei and molecules

TL;DR

This paper reviews key phenomena related to tunneling in composite particles, including resonant tunneling, barrier effects, damping, and continuum influences due to dissociation, highlighting how internal and external degrees of freedom impact tunneling probabilities.

Contribution

It provides a concise overview of how coupling to various degrees of freedom influences tunneling in atoms, nuclei, and molecules, emphasizing recent theoretical insights.

Findings

Resonant tunneling phenomena are affected by level bunching.

Different barriers influence subsystems differently.

Continuum effects due to particle dissociation impact tunneling probabilities.

Abstract

This is a brief review of few relevant topics on tunneling of composite particles and how the coupling to intrinsic and external degrees of freedom affects tunneling probabilities. I discuss the phenomena of resonant tunneling, different barriers seen by subsystems, damping of resonant tunneling by level bunching and continuum effects due to particle dissociation.