Abstract Photons are described by particle and wave theories. It is accepted photons do not possess mass, charge nor are deflected by a magnetic field. A 2005 review concluded photon mass was mathematically feasible, but lacked experimental evidence [1]. During electron-spin-resonance experiments, hair containing melanin was 694 nm laser-irradiated. An ‘off-resonance’ at laser-firing was observed in a time-scan at constant magnetic field, whilst monitoring laser-induced radical formation [2]. It was hypothesised coherent photons interacted with the field, suggesting charge, magnetism and mass. The radical g-value was invariant in successive field-scans, although the hair melted. Melanin in the solid state in hair, does not exhibit temperature-dependent paramagnetism [3]. 2.2 – 3.6 x 1019 photons in 6 – 10 J were calculated to be absorbed, and a mean 72% ‘off resonance’ signal-drop determined from the time-scan, translates to a field-shift of 4 G or 4 x 10-4 T. If the pulse is a point charge (Nphoton .qphoton) with Nphoton the photon number and qphoton the charge per photon, then from the Biot-Savart equation qphoton can be calculated from 0.0004.(Nphoton x 29.98/r2)-1, where r is 1 m, and is 3.6 – 6.1 x 10-25 coulombs. The calculated collision photon : electron charge (q/e) approaches 3 x 10-6. If qphoton is extrapolated for photons moving in air/space by a ‘dilution factor’ of 106 then q/e would be 10-13 and comparable to laboratory-based measurements of 10-14-10-17. The observation and calculations suggest photons are charged; discrepancies in the measured values reflect differences in photon speed at the point of measurement.[1] Liang-Cheng Tu, Jun Luo and George T Gillies. The Mass of the Photon. Rep. Prog Phys 2005: 68; 77-130.[2] Rachel M. Haywood and Claire Linge. Differences in Production of Melanin Radicals by 694 nm Ruby Laser and UVA Radiation. Lasers Surg Medicine 2004: 35; 77-83.[3] Shiu-Shin Chio, James S. Hyde and Roger C. Sealy. Temperature-Dependent Paramagnetism in Melanin Polymers. Arch Biochem Biophys 1980: 199; 133-139.
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