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Ravishankara, A. R., P. H. Wine, and A. O. Langford (1979), Absolute rate constants for the reaction OH(v=0) + O3 ≥ HO2+ O2 over the temperature range 238-357K, J. Chem. Phys., 70, 984-989.

Ravishankara, A. R., P. H. Wine, and A. O. Langford (1979), Absolute rate constant for the reaction OH + HBr = H2O + Br, Chem. Phys. Lett., 63, 479-484.

Langford, A. O., H. Petek, and C. B. Moore (1983), Collisional removal of CH2(1A1): Absolute rate constants for atomic and molecular collision partners, J. Chem. Phys., 78, 6650-6659.

Langford, A. O., and C. B. Moore (1984), Reaction and relaxation of vibrationally excited formyl radicals, J. Chem. Phys., 80, 4204-4210.

Langford, A. O., and C. B. Moore (1984), Collision complex formation in the reactions of formyl radicals with nitric oxide and oxygen, J. Chem. Phys., 80, 4211-4221.

Langford, A. O., V. M. Bierbaum, and S. R. Leone (1985), Flowing afterglow infrared chemiluminescence studies of vibrational energy disposal in the ion molecule reactions F- + HBr,DBr = HF,DF + Br-, J. Chem. Phys., 83, 3913-3918.

Langford, A. O., V. M. Bierbaum, and S. R. Leone (1985), Auroral implications of recent measurements on O(1S) and O(1D) formation in the reaction of N+ with O2, Planet. Space Sci., 33, 1255-1258.

Langford, A. O., B. V.M., and S. R. Leone (1986), Branching ratios for electronically excited oxygen atoms formed in the reaction of N+ with O2 at 300K, J. Chem. Phys., 84, 2158-2166.

Dressler, R. A., H. A. Meyer, A. O. Langford, V. M. Bierbaum, and S. R. Leone (1987), Direct observation of Ba+ velocity distributions in a drift tube using single-frequency laser-induced fluorescence, J. Chem. Phys., 87, 5578-5579.

Fehsenfeld, F. C., et al. (1987), A ground-based intercomparison of NO, NOx and NOy measurement techniques, J. Geophys. Res., 92, 14,710-714,722.

Roberts, J. M., A. O. Langford, and P. D. Goldan (1988), Ammonia measurements at Niwot Ridge, Colorado and Point Arena, California using the tungsten oxide denuder tube technique, J. Atmos. Chem., 7, 137-152.

Langford, A. O., P. D. Goldan, and F. C. Fehsenfeld (1989), A molybdenum oxide annular denuder system for gas phase ambient ammonia measurements, J. Atmos. Chem., 8.

Fehsenfeld, F. C., et al. (1990), Intercomparison of NO2 measurement techniques, J. Geophys. Res., 95, 3579-3597.

Proffitt, M. H., and A. O. Langford (1991), Measuring tropospheric ozone using differential absorption lidar technique, Proc. SPIE, 1491.

Langford, A. O., and F. C. Fehsenfeld (1992), Natural vegetation as a source or sink for atmospheric ammonia: a case study, Science, 255, 581-583.

Langford, A. O., F. C. Fehsenfeld, J. Zachariassen, and D. S. Schimel (1992), Gaseous ammonia fluxes and background concentrations in terrestrial ecosystems of the United States, Global Biogeochemical Cycles, 6, 459-483.

Post, M. J., C. J. Grund, A. O. Langford, and M. H. Proffitt (1992), Observations of Pinatubo ejecta over Boulder, Colorado at three different wavelengths, Geophys. Res. Lett., 19, 195-198.

Williams, E. J., et al. (1992), An intercomparison of five ammonia measurement techniques, J. Geophys. Res., 97, 11,591-511,611.

Mills, M. J., A. O. Langford, T. J. O'Leary, K. Arpag, H. L. Miller, M. H. Proffitt, R. W. Sanders, and S. Solomon (1993), On the relationship between stratospheric aerosols and nitrogen dioxide, Geophysical Research Letters, 20, 1187-1190, doi:1110.1029/1193GL01124.

Hofmann, D. J., et al. (1994), Ozone loss in the lower stratosphere over the United States in 1992-1993: Evidence for heterogeneous chemistry on the Pinatubo aerosol, Geophysical Research Letters, 21, 65-68, doi:10.1029/1093GL02526.

Langford, A. O. (1995), Identification and correction of analog-to-digital-converter nonlinearities and their implications for differential absorption lidar measurements, Applied Optics, 34, 8330-8340.

Langford, A. O., T. J. O'Leary, M. H. Proffitt, and M. H. Hitchman (1995), Transport of the Pinatubo volcanic aerosol to a northern midlatitude site, Journal of Geophysical Research, 100, 9007-9016, doi:9010.1029/9095JD00384.

Proffitt, M. H., and A. O. Langford (1995), Profiling of ozone in the free troposphere by the lidar technique, The Review of Laser Engineering, 23, 104-107.

Lamarque, J.-F., A. O. Langford, and M. H. Proffitt (1996), Cross-tropopause mixing of ozone through gravity wave breaking: Observation and modeling, Journal of Geophysical Research, 101, 22969-22976, doi:22910.21029/22996JD02442.

Langford, A. O., C. D. Masters, M. H. Proffitt, E.-Y. Hsie, and A. F. Tuck (1996), Ozone measurements in a tropopause fold associated with a cut-off low system, Geophysical Research Letters, 23, 2501-2504, doi:2510.1029/2596GL02227.

Langford, A. O., M. H. Proffitt, T. E. Van Zandt, and J.-F. Lamarque (1996), Modulation of tropospheric ozone by a propagating gravity wave, Journal of Geophysical Research, 101, 26605-26613, doi:26610.21029/26696JD02424.

Langford, A. O., C. D. Masters, M. H. Proffitt, E.-Y. Hsie, and A. F. Tuck (1997), Correction to "Ozone measurements in a tropopause fold associated with a cut-off low system", Geophysical Research Letters, 24, 109.

Proffitt, M. H., and A. O. Langford (1997), Ground-based differential absorption lidar system for day or night measurements of ozone throughout the free troposphere, Applied Optics, 36, 2568-2585.

Langford, A. O., C. D. Masters, E.-Y. Hsie, A. F. Tuck, and M. H. Proffitt (1998), Rapid profiling of ozone in a tropopause fold following a cut-off low event, in Atmospheric Ozone, edited by R. D. Bojkov and G. Visconti, pp. 143-146, Parco Scientifico e Technologico d'Abruzzo, L'Aquila.

Langford, A. O., T. J. O'Leary, C. D. Masters, K. C. Aikin, and M. H. Proffitt (1998), Modulation of middle and upper tropospheric ozone at Northern midlatitudes by the El Niño/Southern Oscillation, Geophysical Research Letters, 25, 2667-2670, doi:2610.1029/2698GL01909.

Langford, A. O., and S. J. Reid (1998), Dissipation and mixing of a small-scale stratospheric intrusion in the upper troposphere, Journal of Geophysical Research, 103, 31265-31276, doi:31210.31029/31298JD02596.

Proffitt, M. H., and A. O. Langford (1998), Tropospheric ozone measurements at a midlatitude site using the RTD-DIAL technique, paper presented at Optical Remote Sensing for Industry and Environmental Monitoring, Society of Photo-Optical Instrumentation Engineers, Beijing, China/15-17 September 1998.

Langford, A. O. (1999), Stratosphere-troposphere exchange at the subtropical jet: Contribution to the tropospheric ozone budget at midlatitudes, Geophysical Research Letters, 26, 2449-2452.

Daniel, J. S., S. Solomon, R. W. Portmann, A. O. Langford, C. S. Eubank, E. G. Dutton, and W. Madsen (2002), Cloud liquid water and ice measurements from spectrally resolved near-infrared observations: A new technique, Journal of Geophysical Research, 107, 4599, doi:4510.1029/2001JD000688.

Daniel, J. S., S. Solomon, H. L. Miller, A. O. Langford, R. W. Portmann, and C. S. Eubank (2003), Retrieving cloud information from passive measurements of solar radiation absorbed by molecular oxygen and O2-O2, Journal of Geophysical Research, 108, 4515, doi:4510.1029/2002JD002994.

Hawes, A. K., et al. (2003), Airborne observations of vegetation and implications for biogenic emission characterization, Journal of Environmental Monitoring, 5, 977-983, doi:910.1039/b308911h.

Melamed, M. L., S. Solomon, J. S. Daniel, A. O. Langford, R. W. Portmann, T. B. Ryerson, D. K. Nicks, Jr., and S. A. McKeen (2003), Measuring reactive nitrogen emissions from point sources using visible spectroscopy from aircraft, Journal of Environmental Monitoring, 5, 29-34, doi:10.1039/b204220g.

Sierk, B., S. Solomon, J. S. Daniel, R. W. Portmann, S. I. Gutman, A. O. Langford, C. S. Eubank, K. H. Holub, and S. V. Florek (2003), Field test of spectral line intensity parameters for tropospheric water vapor, Journal of Geophysical Research, 108, 4351, doi:4310.1029/2002JD002985.

Langford, A. O., R. W. Portmann, J. S. Daniel, H. L. Miller, and S. Solomon (2004), Spectroscopic measurements of NO2 in a Colorado thunderstorm: Determination of the mean production by cloud-to-ground lightning flashes, Journal of Geophysical Research, 109, doi:10.1029/2003JD004158.

Sierk, B., S. Solomon, J. S. Daniel, R. W. Portmann, S. I. Gutman, A. O. Langford, C. S. Eubank, E. G. Dutton, and K. H. Holub (2004), DOAS field measurements of water vapor continuum absorption in the visible and near-infrared, Journal of Geophysical Research, 109, D08307, doi:08310.01029/02003JD003586.

Sierk, B., S. Solomon, J. S. Daniel, R. W. Portmann, S. I. Gutman, A. O. Langford, C. S. Eubank, E. G. Dutton, and K. H. Holub (2004), Field measurements of water vapor continuum absorption in the visible and near-infrared, Journal of Geophysical Research, 109, doi:10.1029/2003JD003586.

Langford, A. O., R. W. Portmann, J. S. Daniel, H. L. Miller, C. S. Eubank, S. Solomon, and E. G. Dutton (2005), Retrieval of ice crystal effective diameters from ground-based near-infrared spectra of optically thin cirrus, Journal of Geophysical Research, 110, doi:10.1029/2005JD005761.

Daniel, J. S., R. W. Portmann, H. L. Miller, S. Solomon, A. O. Langford, C. S. Eubank, R. Schofield, D. D. Turner, and M. D. Shupe (2006), Cloud property estimates from zenith spectral measurements of scattered sunlight between 0.9 and 1.7 μm, Journal of Geophysical Research, 111, doi:10.1029/2005JD006641.

Schwarz, J. P., et al. (2006), Single-particle measurements of midlatitude black carbon and light-scattering aerosols from the boundary layer to the lower stratosphere, Journal of Geophysical Research, 111, doi:10.1029/2006JD007076.

Langford, A. O., R. Schofield, J. S. Daniel, R. W. Portmann, M. L. Melamed, H. L. Miller Jr., E. G. Dutton, and S. Solomon (2007), On the variability of the Ring effect in the near ultraviolet: Understanding the role of aerosols and multiple scattering, Atmospheric Chemistry and Physics, 7, 575-586.

Schofield, R., et al. (2007), Retrieval of effective radius and liquid water path from ground-based instruments: A case study at Barrow, Alaska, Journal of Geophysical Research, 112, doi:10.1029/2007JD008737.

Melamed, M. L., A. O. Langford, J. S. Daniel, R. W. Portmann, H. L. Miller, C. S. Eubank, R. Schofield, J. Holloway, and S. Solomon (2008), Sulfur dioxide emission flux measurements from point sources using airborne near ultraviolet spectroscopy during the New England Air Quality Study 2004, Journal of Geophysical Research, 113, doi:10.1029/2007JD008923.

Washenfelder, R. A., A. O. Langford, H. Fuchs, and S. S. Brown (2008), Measurement of glyoxal using incoherent broadband cavity enhanced absorption spectroscopy, Atmospheric Chemistry and Physics Discussions, 8, 16517-16553.

Langford, A. O., C. J. Senff, R. M. Banta, R. M. Hardesty, R. J. Alvarez II, S. P. Sandberg, and L. S. Darby (2009), Regional and local background ozone in Houston during TexAQS 2006, J. Geophys. Res., doi:10.1029/2008JD011687, in press.

Langford, A. O., K. C. Aikin, C. S. Eubank, and E. J. Williams (2009), Stratospheric contribution to high surface ozone in Colorado during springtime,, Geophys. Res. Lett., doi:10.1029/2009GL038367, in press.