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The fluorescence yield in air is reported for wavelength and pressure ranges of interest to ultra-high energy cosmic ray detectors. A 28.5 GeV electron beam was used to excite the fluorescence. Central to the approach was the system calibration, using Rayleigh scattering of a nitrogen laser beam. In atmospheric pressure dry air, at 304 K, the yield is 20.8 ± 1.6 photons per MeV.doi:10.1016/j.nima.2008.08.054 fatcat:ldslh6cxkzfgjlhwwybx2l7aoi