by Clarence Oxford
Los Angeles, CA (SPX) Apr 29, 2026
Chemical physicists on the College of Maryland have demonstrated that the nuclear spin states of molecular hydrogen might be managed just by freezing it inside dry-ice crystals – no magnetic fields or chemical catalysts required. The findings, printed in Bodily Overview Letters on April 29, 2026, open potential paths towards improved hydrogen gasoline storage, extra steady quantum reminiscence, and sharper astronomical measurements of comet formation temperatures.
Molecular hydrogen exists in two nuclear spin configurations: para-H2, wherein the spins of the 2 hydrogen atoms cancel, and ortho-H2, wherein they add collectively. Ortho-H2 has three substates outlined by the rotational path of the nucleus. As hydrogen cools, ortho-H2 naturally tends to transform to the lower-energy para-H2 state. The UMD group discovered that when H2 is frozen inside dry-ice crystals, the crystalline symmetry of the encompassing stable blocks that conversion for 2 of the three ortho-H2 substates whereas leaving one accessible.
“The large discovering is that, relying on what ice we put an H2 molecule into, its quantum dynamics are totally depending on the encompassing surroundings,” mentioned Nathan McLane, a chemical physics graduate pupil and the paper’s lead creator.
The mechanism is rooted within the geometry of crystalline carbon dioxide. Its molecular construction imposes a set of symmetry-based choice guidelines that govern which quantum transitions are permitted. Senior creator Leah Dodson, an assistant professor in UMD’s Division of Chemistry and Biochemistry, framed the broader significance: “We present experimentally that when molecular hydrogen – the best molecule – is confined inside totally different molecular crystals, the symmetry of the encompassing stable determines which quantum spin states can interconvert and which stay protected.”
The group additionally confirmed these guidelines might be intentionally relaxed. Introducing nitrogen dioxide into the dry-ice crystal lattice alters its crystalline properties, enabling all three ortho-H2 substates to transform to para-H2. That skill to tune the permitted transitions represents the core experimental advance.
The U.S. Division of Vitality, which funded the analysis, has a direct curiosity in a single near-term software: hydrogen gasoline storage. As a result of totally different nuclear spin states of hydrogen require totally different quantities of power to warmth up, enriching particular spin states whereas defending others might make storage programs extra environment friendly and steady. When ortho-H2 converts to para-H2 it releases warmth, an element that gasoline managers should account for fastidiously. The group plans to increase the method to methane as a subsequent step.
A second software entails astrochemistry. NASA presently estimates the formation temperatures of comets by measuring the proportions of ortho and para water the comets launch – a calculation that rests on assumptions about how nuclear spins evolve in cometary environments that haven’t been experimentally verified. Dodson, who additionally works in astrochemistry, mentioned the brand new laboratory approach could possibly be used to check these assumptions immediately.
The quantum computing angle is extra speculative however conceptually notable. Defending quantum states from decoherence is a central engineering problem for qubit programs, and the flexibility to isolate particular spin substates utilizing solely crystal geometry means that supplies design alone, reasonably than advanced electromagnetic equipment, might in precept provide a path to state safety. McLane acknowledged the present setup just isn’t a sensible qubit platform – “it is simply H2 in dry ice” – however Dodson described the work as foundational. “This work is setting out the foundational guidelines for a way quantum states would possibly develop into protected,” she mentioned.
UMD chemistry main LeAnh Duckett co-authored the paper with McLane and Dodson. The analysis was supported by the U.S. Division of Vitality Workplace of Science Early Profession Analysis Program below Award Quantity DE-SC0024262.
Analysis Report: Atmosphere-Imposed Choice Guidelines for Nuclear-Spin Conversion of H2 in Molecular Crystals
Associated Hyperlinks
College of Maryland School of Pc, Mathematical and Pure Sciences
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