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{{Short description|Measure of the ratio of stable isotopes nitrogen-15 and nitrogen-14}} ...f>{{cite book | last=Katzenberg | first=MA | title=Biological Anthropology of the Human Skeleton | chapter=Chapter 13: Stable Isotope Analysis: A Tool fo ...

...st4=P. E. |date=1986-10-01 |title=Kinetic fractionation of stable nitrogen isotopes during amino acid transamination |url=https://dx.doi.org/10.1016/0016-7037% ...g others in ecology, demonstrate the utility of stable isotopes as tracers of environmental processes that are difficult to measure directly. ...

...= J. | title = Cost-effective density functional theory (DFT) calculations of equilibrium isotopic fractionation in large organic molecules | journal = P ...13" /><ref name="liu2021">{{cite journal | title = Theoretical calculation of position-specific carbon and hydrogen isotope equilibriums in butane isomer ...

...on|The study of environmental processes using the relative abundance of Si isotopes}} ...n the global Si cycle, and to investigate the applications and limitations of the [[Sedimentary rock|sedimentary]] Si record as an environmental and [[Pa ...

...[[atom]] or [[molecule]] by attachment of an [[electron]] to create an ion of the form <chem>A^-</chem>. The reaction is ...[[energy]] and [[momentum]] a third body is required (the [[molecularity]] of the reaction is three). ...

{{Short description|Different atoms of the same element}} {{About|the atomic variants of chemical elements|other uses|Isotope (disambiguation)}} ...

{{short description|Method by which atoms of a planet's atmosphere are ejected into space}} ...ere, which then begins to expand. This expansion continues into the vacuum of space, accelerating as it goes until it escapes.]] ...

...nanoscale maps of elemental or isotopic distribution, parallel acquisition of up to seven masses, [[isotope|isotopic identification]], high mass resoluti [[File:NanoSIMS50 instrument diagram.png|thumb|Simplified diagram of a NanoSims50 instrument.]] ...

...Various methods are employed to purify and identify the [[radioelement]] of interest through chemical methods and sample measurement techniques. ...active tracer|tracers]], and measure radionuclides in many different types of samples.<ref>Krane, K.S. ''Introductory Nuclear Physics'', 1988, John Wiley ...

{{Short description|Method of geochemical research}} ...h's history of formation and [[Planetary differentiation|differentiation]] of the solid Earth into layers. ...

...H₂O, or H₂¹⁵O) is a radioactive variation of regular water, in which the [[oxygen]] atom has been replaced by [[oxygen-1 ...ow]] (MBF) studies and has been used as reference standard for validations of other MBF quantification techniques, such as [[single-photon emission compu ...

...ctrometry)|characteristics of the sample itself]]. By measuring a material of known isotopic composition, fractionation within the [[Mass spectrometry|ma ...materials are seldom reported. This article aggregates the δ and R values of common and non-traditional stable isotope reference materials. ...

{{short description|Ratio of a slightly volatile element, potassium (K), to a highly refractory element, ...U ratio helps explain the evolution of the planetary system and the origin of Earth's moon. ...

{{Short description|Chemical compound of the form –O–MoO₂–O–}} [[Image:Molybdate.png|thumb|150px|Structure of molybdate]] ...

...t4=Boullis |first4=Bernard |title=Recycling the Actinides, The Cornerstone of Any Sustainable Nuclear Fuel Cycles |journal=Procedia Chemistry |date=2012 ...=Vienna |isbn=978-92-0-108417-0 |edition=2018}}</ref> At the back-end step of the [[nuclear fuel cycle]], two spent fuel management options could be pote ...

...st, but this article focuses on those that are stable. Isotopic variations of trace metals in samples are used as [[Isotopic signature|isotopic fingerpri ...(Δ; the difference between two δ values). For a more complete description of these notations, see the isotope notation section in [[Hydrogen isotope bio ...

{{Short description|Unusual processes that separate isotopes}} .... Letolle, A. Tardieux, P. Tardieux, (1981), Experimental determination of nitrogen kinetic isotope fractionation – Some principles – Illustration for the deni ...

| caption = Time-lapsed photo sequence of WISE 0855−0714's movement in the sky using captured images from the JWST | names = {{nowrap|WISEA J085510.74-071442.5}}, [[Gliese Catalogue of Nearby Stars|GJ]] 11286<ref name="CNS5"/> ...

...al [[comet]]s and [[meteoroid]]s composed solely of [[antimatter]] instead of ordinary [[matter]]. Although never actually observed, and unlikely to exis ...Review Letters]]'', and suggested that [[gamma-ray]] observations be made of the comet to test this hypothesis.<ref name=NS1974a/><ref name=Rojansky1973 ...

{{Short description|Spectroscopic technique based on change of nuclear spin state}} ...ld not be confused with solid state NMR, which aims at removing the effect of the same couplings by [[Magic Angle Spinning]] techniques. ...