Isooctane,no molecular ion 100 M3-NW-0662 CH3CH3 loss of CH3 CH:CCH2CHCH3 (isobutyl) 80 CH3C+ CHs CH3 m+=114 m/z=57 60 BAlDley 40 20 10 20 30 40 50 60 70 80 90 100 m/z Isooctane, no molecular ion CH3CCH2CHCH3 CH3 CH3 CH3 m+ = 114 loss of (isobutyl). CH3C CH3 CH3 + m/z = 57