We present a Fourier-transform spectroscopic technique for investigation of
surfaces and interfaces based on IR-visible sum-frequency generation with
femtosecond light pulses. The observed spectrum has a resolution that is in
dependent of the input pulse characteristics. (C) 1999 Optical Society of A
merica OCIS codes: 190.4350, 300.6300, 190.7110, 300.6490.