Spectra 46 Spectrum analysis 24 Organic compounds 22 Chemistry 18 Spectrochemical analysis 17 Vibrational spectra 17 Molecular spectra 15 Physics 14 Atomic spectra 11 Chemistry, Organic-Spectra 8 Infrared spectra 8 Infrared spectroscopy 7 Absorption spectra 6 Atomic Spectra 6 Molecular spectroscopy 6 Raman spectroscopy 6 Chemistry, Organic 4 Electronic spectra 4 Molecular ray 4 Chemical bonds 3 Molecular structure 3 Molelcular structure 3 Organic 3 Polymers 3 Spectroscopy 3 Wave mechanics 3 Absorption Spectra 2 Chemistry, Analytic 2 Chemistry, Inorganic 2 Crystals 2