Study of the one-dimensional off-lattice hot-monomer reaction model

TL;DR

This paper investigates a one-dimensional off-lattice model of hot monomers undergoing adsorption and reaction, revealing a second-order phase transition in the directed percolation universality class through Monte Carlo simulations and Langevin analysis.

Contribution

It extends the directed percolation universality class to continuous media by studying off-lattice hot monomer reactions with Monte Carlo simulations and a Langevin description.

Findings

Identified a second-order phase transition between reactive and absorbing phases.

Confirmed the universality class as directed percolation.

Extended DP conjecture to continuous media.

Abstract

Hot monomers are particles having a transient mobility (a ballistic flight) prior to being definitely absorbed on a surface. After arriving at a surface, the excess energy coming from the kinetic energy in the gas phase is dissipated through degrees of freedom parallel to the surface plane. In this paper we study the hot monomer-monomer adsorption-reaction process on a continuum (off-lattice) one-dimensional space by means of Monte Carlo simulations. The system exhibits second-order irreversible phase transition between a reactive and saturated (absorbing) phases which belong to the directed percolation (DP) universality class. This result is interpreted by means of a coarse-grained Langevin description which allows as to extend the DP conjecture to transitions occurring in continuous media.