Atomic and Nuclear Physics - GNU Scientific Library -- Reference Manual
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### 40.3 Atomic and Nuclear Physics

`GSL_CONST_MKSA_ELECTRON_CHARGE`
  The charge of the electron, e.
`GSL_CONST_MKSA_ELECTRON_VOLT`
  The energy of 1 electron volt, eV.
`GSL_CONST_MKSA_UNIFIED_ATOMIC_MASS`
  The unified atomic mass, amu.
`GSL_CONST_MKSA_MASS_ELECTRON`
  The mass of the electron, m_e.
`GSL_CONST_MKSA_MASS_MUON`
  The mass of the muon, m_\mu.
`GSL_CONST_MKSA_MASS_PROTON`
  The mass of the proton, m_p.
`GSL_CONST_MKSA_MASS_NEUTRON`
  The mass of the neutron, m_n.
`GSL_CONST_NUM_FINE_STRUCTURE`
  The electromagnetic fine structure constant \alpha.
`GSL_CONST_MKSA_RYDBERG`
  The Rydberg constant, Ry, in units of energy. This is related to the Rydberg inverse wavelength R_\infty by Ry = h c R_\infty.
`GSL_CONST_MKSA_BOHR_RADIUS`
  The Bohr radius, a_0.
`GSL_CONST_MKSA_ANGSTROM`
  The length of 1 angstrom.
`GSL_CONST_MKSA_BARN`
  The area of 1 barn.
`GSL_CONST_MKSA_BOHR_MAGNETON`
  The Bohr Magneton, \mu_B.
`GSL_CONST_MKSA_NUCLEAR_MAGNETON`
  The Nuclear Magneton, \mu_N.
`GSL_CONST_MKSA_ELECTRON_MAGNETIC_MOMENT`
  The absolute value of the magnetic moment of the electron, \mu_e. The physical magnetic moment of the electron is negative.
`GSL_CONST_MKSA_PROTON_MAGNETIC_MOMENT`
  The magnetic moment of the proton, \mu_p.
`GSL_CONST_MKSA_THOMSON_CROSS_SECTION`
  The Thomson cross section, \sigma_T.
`GSL_CONST_MKSA_DEBYE`
  The electric dipole moment of 1 Debye, D.

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