Nuclear Physics & Mass Spectrometry

Mass Spectrometer

Simulate Francis Aston's 1919 mass spectrometer. Separate isotopes by mass-to-charge ratio $m/q$ using a velocity selector $v = E/B_1$ followed by a magnetic deflection chamber where radius $r = \frac{m v}{q B_2}$.

Isotope 1 Radius r₁ 120.0 mm (C-12)

Isotope 2 Radius r₂ 140.0 mm (C-14)

Separation Δr 20.0 mm

Isotope Sample & Fields

Isotope Sample

Deflection B Field 0.40 T

Visual Overlay

Show Injector & Detector Badges

Show Lorentz Force & Velocity Vectors

Show Live Detector Mass Spectrum

Controls

Mass Spectrometer Deflection Radius Formula

Velocity Selector: v = E / B₁
Magnetic Deflection Radius: r = (m · v) / (q · B₂) = (m / q) · (E / B₁ B₂)
Isotope Separation: Δr = (v / q B₂) · (m₂ - m₁)

Developer Reference

Core Algorithm & Standalone Script

// Mass spectrometer m/q magnetic deflection engine
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
// r = m * v / (q * B)