Related by context. Frequent words. (Click for all words.) 63 isotopic composition 60 isotopic 57 spectroscopic 54 stable isotope 54 oxygen atom 54 abundances 54 chemical composition 54 infrared spectroscopy 53 oxygen isotopes 53 spectrometry 53 mass spectroscopy 53 aerosol particles 52 absorbance 52 spectra 52 performance liquid chromatography 52 chirality 52 cuprates 51 anions 51 Spectrometer 51 electron density 51 carbon isotope 51 chromatographic 51 biogenic 51 atmospheric methane 51 GC MS 50 solar nebula 50 anisotropy 50 analyte 50 iron oxides 50 radiocarbon 49 gas chromatography 49 mass spectrometry 49 X ray fluorescence 49 sulfite 49 adsorption 49 viscosity 49 X ray diffraction 49 Fig. 1A 49 mass spectrometer 49 conductivity 48 fluxes 48 isotropic 48 colloid 48 microfossils 48 Nd 48 numerical simulations 48 gel electrophoresis 48 FTIR 48 morphologies 48 lavas 48 aqueous solution 48 hydroxyl 48 ionisation 48 amino acids 48 GPa 48 atomic nucleus 48 rubidium 48 solar corona 48 radiative forcing 48 organic molecules 47 cerium 47 phosphorescence 47 spectrophotometers 47 planetary nebulae 47 biomolecule 47 FT IR 47 extrasolar planet 47 XRD 47 abiotic 47 spectral signature 47 spectrometers 47 silicate 47 capillary electrophoresis 47 olivine 47 Type Ia supernovae 47 analytes 47 reactivity 47 SiO2 47 dynamical 47 muon 47 ESRF 47 FRET 47 atmospheric CO 46 electrical conductivity 46 silicates 46 mineralogy 46 zeolites 46 refractive index 46 spectroscopy 46 mixtures 46 dielectric constant 46 zircons 46 XMM Newton 46 sulphates 46 isomers 46 X ray emission 46 quark gluon plasma 46 desorption 46 photometric 46 HPLC 46 hydrogen atom