physicalconstants.java

化学图形处理软件

/* $RCSfile$
 * $Author: egonw $    
 * $Date: 2007-01-04 18:46:10 +0100 (Thu, 04 Jan 2007) $    
 * $Revision: 7636 $
 * 
 * Copyright (C) 2002-2007  Egon Willighagen <[e-mail]>
 * 
 * Contact: [e-mail]
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package org.openscience.cdk;

/**
 * An class providing predefined properties of physical constants.
 *
 * @cdk.keyword physical properties
 */
public class PhysicalConstants {

    /**
     * Mass of a proton.
     */
    public final static double MASS_PROTON   = 1.6726485E-27;

    /**
     * Mass of an electron.
     */
    public final static double MASS_ELECTRON = 9.109534E-31;

    /**
     * Factor for the conversion of Bohr's to Angstrom's.
     */
    public static final double BOHR_TO_ANGSTROM = 0.529177249;
}