Bichromatic excitation of molecules in a high-intensity infrared laser field

Effective population of the first overtone 2ν₃ of the SF₆ molecule was achieved by the application of two laser fields detuned symmetrically from resonance. This method revealed a structure of the multiphoton excitation spectrum of the OsO₄ molecule in the range of frequencies inaccessible to monochromatic CO₂ laser radiation.