The Atmospheric Chemistry and Surface Interactions on Mars (ACSIOM) Workshop 2025

The ACSIOM workshop was held in Cambridge from 10th-12th November 2025. Its primary aims were twofold: 1) to gather UK researchers involved in Mars atmospheric science to identify current shortcomings and challenges in the field, and 2) to. The new analysis still awaits peer review, but it already lays out the central claim clearly.

It matters because physics only takes a result seriously when the measurement chain remains robust under scrutiny. Experimental particle physics and precision metrology both operate in regimes where the signal sits far below the background noise, and where systematic uncertainties can mimic new physics if not controlled rigorously. The history of the field contains numerous anomalies that generated theoretical excitement before better data showed them to be artifacts, and it also contains genuine discoveries that were initially dismissed as noise. The difference is almost always resolved by independent replication with different instruments and different systematics. The ACSIOM workshop was held in Cambridge from 10th-12th November 2025. 1) to gather UK researchers involved in Mars atmospheric science to identify current shortcomings and challenges in the field, and 2) to discuss possible collaborations and future.

Workshop attendees spanned a wide range of subjects and disciplines, from atmospheric modellers and surface scientists to experimental chemists and Earth/Venus/exoplanet. One of the primary outcomes of the workshop as identified by the attendees was the need for more collaborations between these different communities.

It was agreed that we currently lack sufficient interaction between disciplines and this is a key challenge we need to overcome in order to properly utilise and exploit the vast. Modellers need reaction rates from experimentalists.

Experimentalists need modelling context to prioritise their experiments. Modellers need geological context to constrain their results.

The broader interest lies as much in the method as in the headline number, because a durable measurement procedure can travel farther than a single result. When experimental physicists develop a technique that achieves new sensitivity or controls a previously uncharacterized systematic, that methodological contribution persists even if the specific measurement is later revised. This is one reason why precision physics experiments often generate long-term value that is not immediately visible in the original publication.

Attendees stressed that the UK Mars community has a critical mass which is internationally recognised, and improving the communication between communities would allow significant. We highlight that this is a pivotal moment for such investments as many planetary missions, both for Mars and other terrestrial bodies, are about to be launched or are being.

Because this is still a preprint, the result should be read with genuine interest and proportionate caution. Peer review is not a guarantee of correctness, but it is a process that forces authors to respond to technical criticism from specialists who have no stake in a particular outcome. Preprints that survive that process, often with substantive revisions, emerge with a stronger evidential base than the version that first appeared. Until that stage is complete, the responsible reading keeps uncertainty explicitly visible rather than treating the claims as established findings.

The next step is more measurement, tighter systematic control and scrutiny from groups whose experimental setups are genuinely independent. In experimental particle physics and precision metrology, the threshold for a discovery claim is a five-sigma excess surviving multiple analyses; an intriguing signal at lower significance is a reason to run more experiments, not a reason to revise the textbooks. Next-generation experiments currently under construction or commissioning will revisit several of the open questions that give the current result its context. Until peer review and independent follow-up address those open questions, skepticism is not a failure of appreciation for the work; it is part of how science decides what to keep.

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