H₂ clumped isotope measurements at natural isotopic abundances.

ABSTRACT:

Rationale

Molecular hydrogen (H₂ ) is an important gas for atmospheric chemistry, and an indirect greenhouse gas due to its reaction with OH. The isotopic composition of H₂ (δD) has been used to investigate its atmospheric budget; here we add a new observable, the clumped isotopic signature ΔDD, to the tools that can be used to study the global cycle of H₂ .

Methods

A method for determining ΔDD in H₂ was developed using the high-resolution MAT 253-Ultra isotope ratio mass spectrometer (Thermo Fisher). The HH, HD and DD abundances are quantified at medium resolution (M/ΔM ≈ 6000), which is sufficient for HD⁺ and DD⁺ to be distinguished from H₃ ⁺ and H₂ D⁺ , respective

SUBMITTER: Popa ME 

PROVIDER: S-EPMC6590658 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature