const BZ = 1.38065e-23 # Boltzmann
const PL = 6.62607e-34 # Planck
const PM = 8.8541878128e-12 # permittivity

const M_He = 6.65e-27
const M_Ne = 3.35e-26
const M_Ar = 6.63e-26
const M_Kr = 1.39e-25
const M_Xe = 2.18e-25

const D_He = 2.19e-10
const D_Ne = 2.60e-10
const D_Ar = 3.66e-10
const D_Kr = 4.20e-10
const D_Xe = 4.94e-10

const ω_He = 0.66
const ω_Ne = 0.66
const ω_Ar = 0.81
const ω_Kr = 0.8
const ω_Xe = 0.85
