AEDC = Arnold Engineering Development Complex atm = atmospheres BTU/lb = British Thermal Units per pound cm = centimeters K = degrees Kelvin F = degrees Fahrenheit h = photon energy WV = laser spot size in the vertical dimension, WH = laser spot size in the horizontal dimension S = output voltage of the detection electronics E = laser pulse energy = fluorescence quantum yield = two-photon radial frequency G (2) = second-order intensity autocorrelation function of the laser field G = acceleration due to gravity LIF = laser-induced fluorescence LIFSIM = laser-induced fluorescence spectrum simulation model O = atomic oxygen N = atomic nitrogen O2 = molecular oxygen
