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We compare high-order harmonic generation in gas jets of benzene, cyclohexane, and xenon using ϳ800-nm laser pulses of 70 fs and 240 fs duration. The harmonic intensities of the 7th to 15th orders are studied as a function of laser intensity in the range 5ϫ10 13 to 5ϫ10 15 W cm Ϫ2 . Using 240-fs pulses, the dependence of the harmonic intensity on the laser intensity of the organic molecules exhibits significant deviations from the behavior of atoms, and shows strong evidence for harmonicdoi:10.1103/physreva.62.041803 fatcat:qka7xyiapngjjenzm43bmvofly