We present a versatile chamber ͑"atmospheric corrosion cell"͒ for soft x-ray absorption/emission spectroscopy of metal surfaces in a corrosive atmosphere allowing novel in situ electronic structure studies. Synchrotron x rays passing through a thin window separating the corrosion cell interior from a beamline vacuum chamber probe a metal film deposited on a quartz crystal microbalance ͑QCM͒ or on the inside of the window. We present some initial results on chloride induced corrosion of iron

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... aces in humidified synthetic air. By simultaneous recording of QCM signal and soft x-ray emission from the corroding sample, correlation between mass changes and variations in spectral features is facilitated. Physics 78, 083110-1 083110-2 Forsberg et al. Rev. Sci. Instrum. 78, 083110 ͑2007͒ 083110-3 XAS/RIXS studies of corrosion Rev. Sci. Instrum. 78, 083110 ͑2007͒ 083110-4 Forsberg et al. Rev. Sci. Instrum. 78, 083110 ͑2007͒ 083110-5 XAS/RIXS studies of corrosion Rev. Sci. Instrum. 78, 083110 ͑2007͒