What question did this study set out to answer?

The study aims to understand the nature of Au-bearing states before Au-H chemistry in post-r-process events.

April 8, 20260 citationsOpen Access

Au-Bearing Precursors to Transient Gold Hydride Chemistry in Post-r-Process Ejecta

Key Points

The study aims to understand the nature of Au-bearing states before Au-H chemistry in post-r-process events.
Theoretical investigation into gold states in post-r-process ejecta
Analysis of existing models for Au-H interactions
Formulation of the Au-bearing precursor problem
Consideration of DFT calculations and spectroscopic observations for future research
Gold may exist in a more complex state before forming hydrides, rather than as simple elemental Au.
The study opens new avenues for exploring post-nucleosynthetic astrochemistry.

Abstract

This paper presents a theoretical investigation into the nature of the Au-bearing states immediately preceding transient Au–H chemistry in post-r-process kilonova ejecta. Conventional models implicitly assume that gold synthesized via the r-process exists as isolated monatomic Au before interacting with hydrogen. However, the 2025 SLAC/European XFEL synthesis of Au₂Hₓ under extreme pressure and temperature, using hydrocarbon-derived hydrogen, suggests that Au–H chemistry need not proceed through simple binary association of bare Au and free H. This paper formulates the Au-bearing precursor problem: was the Au-bearing state immediately preceding any transient gold hydride chemistry truly elemental gold, or a more complex intermediate? This question is positioned not as a challenge to r-process nucleosynthesis theory, but as a new research question in post-nucleosynthetic astrochemistry, tractable through future DFT calculations, laboratory experiments, and spectroscopic observation.

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