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| constexpr Units | AMP::Constants::a0 ("m", 5.2917721090380e-11) |
| | Bohr radius: h_bar^2/(k_e*me*e^2) or r_e/alpha^2.
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| constexpr Units | AMP::Constants::alpha ("", 7.297352569311e-3) |
| | fine-structure constant: e^2/(4*pi*eplison0*h_bar*c)
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| constexpr Units | AMP::Constants::alpha_1 ("", 137.03599908421) |
| | inverse fine-structure constant: (4*pi*eplison0*h_bar*c)/e^2
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| constexpr Units | AMP::Constants::b ("m*K", 2.897771955e-3) |
| | Wien wavelength displacement law constant.
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| constexpr Units | AMP::Constants::b_entropy ("m*K", 3.002916077e-3) |
| | Wien entropy displacement law constant.
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| constexpr Units | AMP::Constants::bf ("Hz*K^-1", 5.878925757e10) |
| | Wien frequency displacement law constant.
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| constexpr Units | AMP::Constants::c ("m*s^-1", 299792458) |
| | speed of light in vacuum
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| constexpr Units | AMP::Constants::c1L ("W*m^2*sr^-1", 1.1910429723971884140794892e-16) |
| | first radiation constant for spectral radiance: 2*h*c/sr
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| constexpr Units | AMP::Constants::c2 ("m*K", 1.438776877e-2) |
| | second radiation constant: h*c/kB
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| constexpr Units | AMP::Constants::ca ("W*m^2", 3.741771852e-16) |
| | first radiation constant: 2*pi*h*c^2
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| constexpr Units | AMP::Constants::dnu_Cs ("Hz", 9192631770) |
| | hyperfine transition frequency of 133Cs
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| constexpr Units | AMP::Constants::e ("C", 1.602176634e-19) |
| | elementary charge
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| constexpr Units | AMP::Constants::Eh ("J", 4.359744722207185e-18) |
| | Hartree energy: alpha^2*c^2*me.
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| constexpr Units | AMP::Constants::epsilon0 ("F*m^-1", 8.854187812813e-12) |
| | vacuum electric permittivity
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| constexpr Units | AMP::Constants::F ("C*mol^-1", 96485.3321233100184) |
| | Faraday constant: NA*e.
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| constexpr Units | AMP::Constants::Fermi_coupling ("GeV^-2", 1.16637876e-5) |
| | Fermi coupling constant: Gf/(h_bar*c^3)
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| constexpr Units | AMP::Constants::G ("m^3 kg^-1 s^-2", 6.6743015e-11) |
| | Newtonian constant of gravitation.
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| constexpr Units | AMP::Constants::G0 ("S", 7.748091729e-5) |
| | conductance quantum: 2*e^2/h
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| constexpr Units | AMP::Constants::G0_1 ("ohm", 12906.40372) |
| | inverse conductance quantum: h/(2*e^2)
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| constexpr Units | AMP::Constants::g_e ("", -2.0023193043625635) |
| | electron g-factor
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| constexpr Units | AMP::Constants::g_mu ("", -2.002331841813) |
| | muon g-factor
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| constexpr Units | AMP::Constants::g_p ("", 5.585694689316) |
| | proton g-factor
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| constexpr Units | AMP::Constants::h ("J*Hz^-1", 6.62607015e-34) |
| | Planck constant.
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| constexpr Units | AMP::Constants::h_bar ("J*s", 1.054571817e-34) |
| | reduced Planck constant: h/(2*pi)
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| constexpr Units | AMP::Constants::HJ ("Hz*V^-1", 483597.8484e9) |
| | Josephson constant: 2*e/h.
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| constexpr Units | AMP::Constants::I0 ("Wb", 2.067833848e-15) |
| | magnetic flux quantum: h/(2*e)
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| constexpr Units | AMP::Constants::kB ("J*K^-1", 1.380649e-23) |
| | Boltzmann constant.
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| constexpr Units | AMP::Constants::ke ("N*m^2*C^-2", 8.987551792314e9) |
| | Coulomb constant.
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| constexpr Units | AMP::Constants::m_12C ("kg", 1.9926468799260e-26) |
| | atomic mass of carbon-12
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| constexpr Units | AMP::Constants::M_12C ("kg*mol^-1", 11.999999995836e-3) |
| | molar mass of carbon-12
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| constexpr Units | AMP::Constants::m_mu ("kg", 1.88353162742e-28) |
| | muon mass
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| constexpr Units | AMP::Constants::m_t ("kg", 3.078453e-25) |
| | top quark mass
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| constexpr Units | AMP::Constants::m_tau ("kg", 3.1675421e-27) |
| | tau mass
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| constexpr Units | AMP::Constants::m_u ("kg", 1.6605390666050e-27) |
| | atomic mass constant: m_12C/12
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| constexpr Units | AMP::Constants::M_u ("kg*mol^-1", 0.9999999996530e-3) |
| | molar mass constant: M_12C/12
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| constexpr Units | AMP::Constants::me ("kg", 9.109383701528e-31) |
| | electron mass
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| constexpr Units | AMP::Constants::mn ("kg", 1.6749274980495e-27) |
| | neutron mass
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| constexpr Units | AMP::Constants::molar_Plank ("J*s*mol^-1", 3.9903127128934314e-10) |
| | molar Planck constant: NA*h
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| constexpr Units | AMP::Constants::mp ("kg", 1.6726219236951e-27) |
| | proton mass
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| constexpr Units | AMP::Constants::mp_me ("", 1836.1526734311) |
| | proton-to-electron mass ratio: mp/me
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| constexpr Units | AMP::Constants::mu0 ("N*A^-2", 1.2566370621219e-6) |
| | vacuum magnetic permeability
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| constexpr Units | AMP::Constants::mu_B ("J*T^-1", 9.274010078328e-24) |
| | Bohr magneton: e*h_bar/(2*me)
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| constexpr Units | AMP::Constants::mu_N ("J*T^-1", 5.050783746115e-27) |
| | nuclear magneton: e*h_bar/(2*mp)
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| constexpr Units | AMP::Constants::mW_mZ ("", 0.8815317) |
| | W-to-Z mass ratio: m_W/m_Z.
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| constexpr Units | AMP::Constants::NA ("mol^-1", 6.02214076e23) |
| | Avogadro constant.
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| constexpr Units | AMP::Constants::quantum_circulation ("m^2*s^-1", 3.636947551611e-4) |
| | quantum of circulation: h_bar/(2*me)
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| constexpr Units | AMP::Constants::R ("J*mol^-1*K^-1", 8.31446261815324) |
| | molar gas constant: NA*kB
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| constexpr Units | AMP::Constants::r_e ("m", 2.817940326213e-15) |
| | classical electron radius: e^2*k_e/(me*c^2)
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| constexpr Units | AMP::Constants::R_inf ("m^-1", 10973731.56816021) |
| | Rydberg constant: alpha^2*me*c/(2*h)
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| constexpr Units | AMP::Constants::RK ("ohm", 25812.80745) |
| | von Klitzing constant: h/e^2
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| constexpr Units | AMP::Constants::Ry ("J", 2.179872361103542e-18) |
| | Rydberg unit of energy: Eh/2.
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| constexpr Units | AMP::Constants::sigma ("W*m^-2*K^-4", 5.670374419e-8) |
| | Stefan-Boltzmann constant: pi^2*kB^4/(60*k_bar^3*c^2)
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| constexpr Units | AMP::Constants::sigma_e ("m^2", 6.652458732160e-29) |
| | Thomson cross section: (8*pi/3)*r_e^2.
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| constexpr Units | AMP::Constants::theta_W ("", 0.2229030) |
| | weak mixing angle: sin^2(theta)=1-(m_W/m_Z)^2
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| constexpr Units | AMP::Constants::Vm_Si ("m^3*mol^-1", 1.20588319960e-5) |
| | molar volume of silicon
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| constexpr Units | AMP::Constants::Z0 ("ohm", 376.73031366857) |
| | characteristic impedance of vacuum: mu0*c
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