Related by context. Frequent words. (Click for all words.) 64 spectra 60 wavelength 58 diffraction 58 spectroscopic 56 interferometry 55 wavelengths 55 spatial resolution 55 multispectral 55 reflectance 53 luminescence 53 excitation 53 fluorescence 53 luminosity 53 gamma ray 52 redshift 52 spectroscopy 52 infrared 52 infrared wavelengths 52 XMM Newton 52 μm 51 photon 51 surface roughness 51 luminance 51 isotopic 51 interferometer 51 ghostly 50 photodiode 50 planar 50 multipath 50 atmospheric 50 brightness 50 amplitudes 50 tunable 50 conductivity 49 infrared radiation 49 Fluorescence 49 resistivity 49 particle 49 magnetization 48 THz 48 temporal 48 jitter 48 vibrational 48 photons 48 linearity 48 starlight 48 electromagnetic 48 X ray diffraction 48 abundances 48 modulation 48 interstellar dust 48 infrared IR 48 CCD camera 48 speckle 48 harmonics 47 waveform 47 quasar 47 luminous 47 modulated 47 pulsation 47 Spectrometer 47 reflectivity 47 distant galaxies 47 angular 47 conductance 47 radiometric 47 spectrometer 47 astrophysical 47 harmonic 47 Raman spectroscopy 47 laser pulses 46 beamforming 46 amplitude 46 geometries 46 dielectric constant 46 chromatic 46 optical 46 parallax 46 galaxy cluster 46 interpolation 46 electron 46 interleaved 46 gamma rays 46 spatial 46 modulations 45 photodiodes 45 optically 45 quasars 45 radii 45 cosmic microwave background 45 waveguide 45 infra red 45 adsorption 45 resonator 45 fluxes 45 luminescent 45 refractive index 45 ionosphere 45 pixel 45 microscopy 45 dispersion