IR Spectrum of Octane wavelength (um) 2.5 3 3.5 4 4.5 5 5.56 7 8 9 10 11 1213141516 10 (b) 80 CH2 CH3 rock rock 60 CH2 -FF scissor C-H stretch CH:(CH2)CH; 20 n-octane 0 4000 3500 3000 2500 200018001600140012001000 800 600 wavenumber(cm) fingerprint region IR Spectrum of Octane