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Header <boost/units/systems/si/codata/atomic-nuclear_constants.hpp>

namespace boost {
  namespace units {
    namespace si {
      namespace constants {
        namespace codata {
           BOOST_UNITS_PHYSICAL_CONSTANT(alpha, quantity< dimensionless >, 
                                         7.2973525376e-3 *, 5.0e-12 *);

          // Rydberg constant. 
           BOOST_UNITS_PHYSICAL_CONSTANT(R_infinity, quantity< wavenumber >, 
                                         10973731.568527/ meter, 
                                         7.3e-5/ meter);

          // Bohr radius. 
           BOOST_UNITS_PHYSICAL_CONSTANT(a_0, quantity< length >, 
                                         0.52917720859e-10 * meters, 
                                         3.6e-20 * meters);

          // Hartree energy. 
           BOOST_UNITS_PHYSICAL_CONSTANT(E_h, quantity< energy >, 
                                         4.35974394e-18 * joules, 
                                         2.2e-25 * joules);
        }
      }
    }
  }
}

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