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GSL_CONST_MKSA_ELECTRON_CHARGEThe charge of the electron, e.
GSL_CONST_MKSA_ELECTRON_VOLTThe energy of 1 electron volt, eV.
GSL_CONST_MKSA_UNIFIED_ATOMIC_MASSThe unified atomic mass, amu.
GSL_CONST_MKSA_MASS_ELECTRONThe mass of the electron, m_e.
GSL_CONST_MKSA_MASS_MUONThe mass of the muon, m_\mu.
GSL_CONST_MKSA_MASS_PROTONThe mass of the proton, m_p.
GSL_CONST_MKSA_MASS_NEUTRONThe mass of the neutron, m_n.
GSL_CONST_NUM_FINE_STRUCTUREThe electromagnetic fine structure constant \alpha.
GSL_CONST_MKSA_RYDBERGThe 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_RADIUSThe Bohr radius, a_0.
GSL_CONST_MKSA_ANGSTROMThe length of 1 angstrom.
GSL_CONST_MKSA_BARNThe area of 1 barn.
GSL_CONST_MKSA_BOHR_MAGNETONThe Bohr Magneton, \mu_B.
GSL_CONST_MKSA_NUCLEAR_MAGNETONThe Nuclear Magneton, \mu_N.
GSL_CONST_MKSA_ELECTRON_MAGNETIC_MOMENTThe 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_MOMENTThe magnetic moment of the proton, \mu_p.
GSL_CONST_MKSA_THOMSON_CROSS_SECTIONThe Thomson cross section, \sigma_T.
GSL_CONST_MKSA_DEBYEThe electric dipole moment of 1 Debye, D.