Abstract
The time and wavelength evolution of the optical emission from AgCl and AgBr at low temperature (\ensuremath{\sim}4 K) has been investigated. These data characterize the emission from AgCl (${\ensuremath{\lambda}}_{\mathrm{max}}$=500 nm) as partially due to donor-acceptor recombination and from AgBr (${\ensuremath{\lambda}}_{\mathrm{max}}$=580 nm) as wholly due to donor-acceptor recombination. These conclusions are supported by optically detected magnetic resonance data and other spectroscopic information, which suggest that the donors are interstitial silver ions or substitutional divalent-cation impurities and that the acceptor in AgCl is a self-trapped hole.
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