Coordination numbers as reaction coordinates in constrained molecular dynamics

نویسنده

  • Michiel Sprik
چکیده

Reaction coordinates for chemical reactions in solution are often of a collective nature involving solvent degrees of freedom. A recent generalization of the blue-moon ensemble technique has enabled us to determine the free energy required to change these variables, using them as constraints in a molecular dynamics simulation. We discuss a Ðrst application to the free energy of coordination Ñuctuations of an argon atom in liquid argon.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Blue moon sampling, vectorial reaction coordinates, and unbiased constrained dynamics.

We give a new formula expressing the components of the mean force in terms of a conditional expectation which can be computed by Blue Moon sampling. This generalizes to the vectorial case a formula first derived by Ruiz-Montero et al. for a scalar reaction coordinate. We also discuss how to compute this conditional average by means of constrained stochastic dynamics which, unlike the usual cons...

متن کامل

Activation energies by molecular dynamics with constraints

Recently Tobias and Broods introduced a method to compute by molecular dynamics with constraints the probability density P(r) = (&r-7)) associated with rate values i of a spatial coordinate r. In this Letter we extend their approach to the case of a general reaction coordinate C(r), an arbitrary function of the configuration-space coordinates. The generalized version is shown to be the integral...

متن کامل

Molecular Dynamics Simulation of Al/NiO Thermite Reaction Using Reactive Force Field (ReaxFF)

In this work, the thermal reaction of aluminum (Al) and nickel oxide (NiO) was investigated by molecular dynamics simulations. Some effective features of reaction such as reaction temperature, the reaction mechanism, and diffusion rate of oxygen into aluminum structure were studied. ReaxFF force field was performed to study the Al/NiO thermite reaction behavior at five different temperatures (5...

متن کامل

Mechanical behaviour of motion for the two-dimensional monolayer system‎

‎In this paper we study the dynamics of the 2D-motion of a particle of monolayer‎. First we consider the usual physical time component and the plan manifold R2, having the polar coordinates. Then a geometric approach to nonholonomic constrained mechanical systems is applied to a problem from the two dimensional geometric dynamics of the Langmuir-Blodgett monolayer‎. We consider a constraint sub...

متن کامل

Analytic energy gradients for constrained DFT- configuration interaction Citation

The constrained density functional theory–configuration interaction (CDFT-CI) method has previously been used to calculate ground-state energies and barrier heights, and to describe electronic excited states, in particular conical intersections. However, the method has been limited to evaluating the electronic energy at just a single nuclear configuration, with the gradient of the energy being ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1998