unit_conversion.c

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/*
** unit_conversion.c
** 
** Made by (Johnny Q. Hacker)
** Login   <solarion@borkborkbork>
** 
    Copyright (C) 2009 Joseph Pingenot

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

** Started on  Thu Nov 19 22:52:01 2009 Johnny Q. Hacker
** Last update Sun May 12 01:17:25 2002 Speed Blue
*/

#include "unit_conversion.h"

/*From NIST: http://physics.nist.gov/cuu/Constants/index.html*/

const double mag_q_e_in_C = 1.602176487e-19;
const double ev_in_hartree = 1.0/27.21138386;
const double hartree_in_ev = 27.21138386;
const double bohr_in_meters = 0.529177208e-10;
const double bohr_in_nmeters = 0.529177208e-1;

/*hbar, in eV s*/
const double hbar = 6.58211899e-16;
/*Speed of light in m/s*/
const double c = 299792458;
/*mass of electron in eV s^2 m^-2*/
const double m0 = 0.510998910e6/(299792458.0*299792458.0);
/*Magnitude of the charge of the electron in C*/
const double e = 1.602176487e-19;
/*Charge of the elecron in C*/
const double q_e = -1.602176487e-19;
/*vacuum dielectric constant F/m*/
const double epsilon0 = 8.854187817e-12;
/*one over vacuum dielectric constant F/m*/
const double oo_epsilon0 = 1.0/8.854187817e-12;


___const double ev_to_hartree(double ev) {
  return ev * ev_in_hartree;
}

___const double hartree_to_ev(double hartree) {
  return hartree * hartree_in_ev;
}

___const double bohr_to_m(double bohr) {
  return bohr*bohr_in_meters;
}

___const double m_to_bohr(double m) {
  return m/bohr_in_meters;
}

___const double bohr_to_nm(double bohr) {
  return bohr*bohr_in_nmeters;
}

___const double nm_to_bohr(double nm) {
  return nm/bohr_in_nmeters;
}