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An efficient and straightforward approach is proposed to produce extreme ultraviolet frequency combs by using high-order harmonic generation from diatomic molecules driven by surface-enhanced high-repetitionrate femtosecond pulses. For a nonpolar molecule, the maximum ͑minimum͒ energy conversion efficiency is observed as the molecule is oriented at an angle of 27°͑108°͒ relative to the surface. For a polar molecule, the frequency components of the generated ultraviolet frequency combs aredoi:10.1103/physreva.77.053412 fatcat:rf4tcppoeffodjflnd2xswuica