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Recently, the production of ultrahigh-density (~10^{19}cm^{-3})spin-polarized deuterium (SPD) atoms was demonstrated, from thephotodissociation of deuterium iodide, but the upper density limit was notdetermined. Here, we present studies of spin-polarized hydrogen (SPH) densitiesup to 10^{20} cm^{-3}, by photodissociating 5 bar of hydrogen chloride with afocused 213 nm, 150 ps laser pulse. We extract the depolarization cross-sectionof hydrogen and chlorine atom collisions, which is the main depolarizationmechanism at this high-density regime, to be {\sigma}_{HCl} = 7(2) x10^{-17}cm^2. We discuss the conditions under which the ultrahigh SPH and SPDdensities can be reached, and the potential applications to ultrafastmagnetometry, laser-ion acceleration, and tests of polarized nuclear fusion.

Depolarization of Spin-Polarized Hydrogen via Collisions with Chlorine Atoms at Ultrahigh Density