Barrierless Reactions in Solution: An Analytically Solvable Model

TL;DR

This paper introduces an analytical solution for barrierless reactions in solution, explicitly considering both reactant and product potentials, and simplifies the problem using Laplace transforms of Green's functions.

Contribution

It presents a novel, more general analytical model for barrierless reactions that explicitly incorporates both reactant and product potential energy surfaces.

Findings

Provides an exact analytical solution for the reaction model.

Extends previous models by including both potentials explicitly.

Uses Laplace transforms of Green's functions for solution.

Abstract

We propose an analytical method for solving the problem of barrierless reactions in solution, modeled by a particle undergoing diffusive motion under the influence of both reactant and product potentials. The coupling between these two potentials is taken to be a Dirac Delta function. The diffusive motion in this paper is described by the Smoluchowskii equation. Our solution requires only the knowledge of the Laplace transform of the Green's function for the motion in both the uncoupled potentials. Our model is more general than all the earlier models, because we are the first one to consider the potential energy surfaces of both the reactant and product explicitly.