SEARCH Articles Figures Tables Electronic sum frequency generation Harmonic Generations and Sum-Frequency Spectroscopy Infrared and sum frequency Infrared and sum frequency generation Phase matching, sum frequency generation Principles of Sum-Frequency Vibrational Spectroscopy SFG = sum frequency generation Sum and Difference Frequency Generation Sum frequency generation Sum frequency generation spectroscopy Sum frequency spectroscopy Sum-Frequency and Higher-Harmonic Generation Sum-combination frequency Sum-frequency intensities Sum-frequency mixing Sum-frequency vibrational spectroscopy SFVS) Three-wave mixing processes doubling, sum and difference frequency Vibrational sum frequency generation Vibrational sum frequency generation spectroscopy Vibrational sum frequency spectroscopy