A new class of surface-sensitive, time-resolved experiments that is complementary to two-photon photoemission (2PPE) was introduced. Two well-established techniques: four-wave mixing (4WM) and second-harmonic generation (SHG) were combined to obtain a five-wave-mixing (5WM) process. The potential of the technique was demonstrated with results obtained for a Si(001) surface using ultrashort 13 fs pulses. The observed delayed rise and decay of the 5WM signal on time scales of 50 and 250 fs were both interpreted in terms of scattering within the Ddown band of the reconstructed surface.
ASJC Scopus subject areas
- Physics and Astronomy(all)