AtomicAndPhysicalConstants.jl

AtomicAndPhysicalConstants.jl provides fundamental physical constants and particle data drawn from official CODATA releases (2002 – 2022). Values are expressed in units natural to accelerator and atomic physics (eV, eV/c², eV·s, eV/T, …).

Installation

using Pkg
Pkg.add("AtomicAndPhysicalConstants")

Quick start

using AtomicAndPhysicalConstants

# ── physical constants ──────────────────────────────────────────────
C_LIGHT    # 2.99792458e8  m/s
H_PLANCK   # 4.135667696e-15  eV·s
M_ELECTRON # 510998.95069  eV/c²

# ── particle species ────────────────────────────────────────────────
e    = Species("electron")
p    = Species("proton")
h    = Species("H")          # neutral hydrogen, abundance-averaged mass
he3  = Species("#3He")       # neutral helium-3
hion = Species("H+")         # singly-ionised hydrogen
antip = Species("anti-proton")

# ── accessor functions ───────────────────────────────────────────────
massof(e)                    # 510998.95069  eV/c²
massof(h, AMU=true)          # mass in atomic mass units
chargeof(hion)               # 1.0  (units of e)
spinof(e)                    # 0.5  ħ
g_spin(e)                    # 2.00231930436092  (unsigned; signed=true for -2.0023…)
gyromagnetic_anomaly(e)      # ≈ 0.00115965…  = (|g| - 2)/2
momentof(p)                  # magnetic dipole moment  eV/T
iso_of(he3)                  # 3  (mass number)

Species fields are read only through these accessors — e.mass raises an error on purpose. See Accessing species parameters for the complete list, the unit-switching keyword arguments, and what each accessor returns for species that do not carry the property.

Package overview