δ-notation framework: δ = (R_sample/R_std − 1)·1000 ‰ (parts-per-mille isotope-ratio deviation)

Layer 2 — Chemistryin the geochemistry subtree

The δ-notation — the universal convention for reporting light stable-isotope ratios in geochemistry, paleoclimate, and cosmochemistry. R_sample is the heavy/light isotope ratio in the sample (e.g. ¹⁸O/¹⁶O, ¹³C/¹²C, D/H, ³⁴S/³²S), R_std is…

Related concepts

R/R₀ = f^{α−1}: at f=1 ⇒ 1; at α=1 ⇒ 1 (no-fractionation limits)
δ = 1000·R_s/R_std − 1000; δ|_{R=R_std} = 0 ‰; δ|_{R=2R_std} = 1000 ‰
Inverse of a conditional

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