dmcut2: Arrhenius.hpp Source File

00001 /*
00002     dmcut2, a library for Monte-Carlo simulations at surfaces
00003     Copyright (C) 2008 Mathias Laurin <mathias_laurin@users.sourceforge.net>
00004 
00005     This program is free software; you can redistribute it and/or modify
00006     it under the terms of the GNU General Public License as published by
00007     the Free Software Foundation; either version 2 of the License, or
00008     (at your option) any later version.
00009 
00010     This program is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013     GNU General Public License for more details.
00014 
00015     You should have received a copy of the GNU General Public License along
00016     with this program; if not, write to the Free Software Foundation, Inc.,
00017     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00018 */
00024 #ifndef ARRHENIUS_HPP
00025 #define ARRHENIUS_HPP
00026 
00027 #include <cmath> // provide exp
00028 
00030 extern double BOLTZMAN;
00031 
00037 inline double Arrhenius(double preexponential_factor, double activation_energy, double temperature)
00038 { return preexponential_factor*exp(-activation_energy/(BOLTZMAN*temperature)); }
00039 
00040 #endif