Measurements of HNO3 and N2O5 using Ion drift – Chemical Ionization Mass Spectrometry during the MCMA – 2006 Campaign

1 Dept. Atmospheric Sciences, Texas A & M University, College Station, Texas 77843, TX, USA 2 Molina Center for Energy and the Environment, La Jolla, CA, USA 3 Dept. Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA 4 Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland 5 Dept. Chemistry, Indiana University, Bloomington, IN, USA 6 Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, USA * now at: Dept. Chemistry and Biochemistry, Montana State University, Bozeman, MT, USA