]> Ed Shaya This ontology covers classes and properties in chemistry that are commonly used by astronomers. It includes terms from the IVOA Thesaurus plus terms from the UMD astronomical ontology chemistry.owl abnormal spectrum absorption line absorption spectrum abundance element abundance chemical abundance stellar abundance abundance ratio actinium Ac aluminum Al americium Am ammonia antimony Sb argon Ar arsenic As astatine At atomic spectrum Balmer continuum Balmer limit Balmer series Balmer line barium Ba berkelium Bk beryllium Be bismuth Bi bohrium Bh boron B Brackett series bromine Br cadmium Cd caesium cesium Cs Ca II emission line calcium Ca calcium line californium Cf carbon C carbon compound carbon dioxide CO_2 CO2 carbon disulfide carbon line carbon monosulfide CS carbon monoxide CO cerium Ce chemical composition a chemical substance that is composed of a particular set of molecules or ions. Two or more elements combined into one substance, through a chemical reaction, form what is called a chemical compound chemical element a chemical substance that is made up of a particular kind of atoms and hence cannot be broken down or transformed by a chemical reaction into a different element, though it can be transmutated into another element through a nuclear reaction chemical equilibrium chemical evolution chemical Substance any material with a definite chemical composition chemiluminescence chemistry chlorine Cl chromium Cr cobalt Co composition continuous spectrum copper Cu CS curium Cm cyanoacetylene cyanodiacetylene cyanogen CN cyanogen line cyanopolyene darmtadtium Ds deuterium D line dubnium Db dysprosium Dy einsteinium Es emission line erbium Er ethane ethylene europium Eu fermium Fm florine F forbidden line francium Fr Fraunhofer line fundamental chemical element gadolinium Gd gallium Ga gamma-ray line gamma ray line gas content germanium Ge gold Au graphite hafnium Hf H alpha H and K line hassium Hs H beta H delta He I He II He III helium He H epsilon H gamma H II ionized hydrogen H line holmium Ho hydrated carbon CH hydrocarbon hydrogen H hydrogen line hydrogen spectrum hydroxyl radical OH OH radical hyperfine line indium In ion temperature>A spectral line emitted in a transition between energy levels that have different multiplicities, that is, different values of the total spin quantum number. iodine I ion charged particle ion composition ionization ionisation UK ionization equilibrium ionisation equilibrium UK ionized gas ion temperature iridium Ir iron Fe isotope isotopic abundance isotopic composition krypton Kr Two microwave lines in of the spectrum of the OH molecule caused by the splitting of electronic levels. lanthanum La lawrencium Lr lead Pb line broadening spectral line broadening line formation spectral line formation line intensity line parameter line ratio line spectrum line width spectral line width lithium Li This is the number of molecules in a cubic metre of an ideal gas at s.t.p. It is equal to the Avogadro constant divided by the molar volume. lutetium Lu Lyman alpha Lyman beta Lyman continuum Lyman series magnesium Mg manganese Mn meitnerium Mt mendelevium Md mercury Hg metal abundance metallicity metal line methane CH_4 CH4 molecular band molecular hydrogen molecular line molecular spectroscopy molecular spectrum molecule molybdenum Mo natural line broadening natural line width negative H ion H- ion H- H minus ion neodymium Nd neon Ne neptunium Np nickel Ni niobium Nb nitrogen N nobelium No OH line organic matter organic molecule orthohydrogen osmium Os overabundance oxygen O palladium Pd parahydrogen Paschen series Paschen line P-branch A set of lines in the spectra of molecules corresponding to unit increases in rotational energy. Pfund series Phillips band phosphorus P photochemistry photodissociation photoionization photoionisation UK photoluminescence platinum Pt plutonium Pu polonium Po polycyclic hydrocarbon potassium K praseodymium Pr promethium Pm protactinium Pa Q-branch A set of lines in the spectra of molecules corresponding to unit increases in vibrational energy. radical atomic or molecular species with unpaired electrons on an otherwise open shell configuration. These unpaired electrons are usually highly reactive radium Ra radon Rn Raman effect Raman spectroscopy Raman spectrum rare earth recombination recombination line resonance line rhenium Re rhodium Rh roentgenium Rg rubidium Rb ruthenium Ru rutherfordium Rf samarium Sm scandium Sc seaborgium Sg selenium Se silicon Si silicon monoxide SiO silver Ag sodium Na spectral index spectral line spectrum line spectroscopic analysis spectral analysis strontium Sr sulfur sulphur S A multiplet of multiplets. tantalum Ta technetium Tc technetium line tellurium Te temperature effect on reaction rate thermal effect terbium Tb thallium Tl thorium Th thulium Tm tin Sn titanium Ti titanium oxide TiO trace element tritium tungsten W ultraviolet line underabundance uranium U vanadium V volatile water water ice ice water vapor water vapor xenon Xe X-ray line ytterbium Yb yttrium Y zinc Zn zirconium Zr The term chiral is used to describe an object that is non-superimposable on its mirror image. Usually chirality of isomers are designated left-handed or right-handed. Other designations are R/S (for configurations), +/- and d/l (for optical activity). or D/L Usage: abundance (Measurement) ofSubstance substance (like chlorine)