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Researchers have revised theoretical models of hydrogen photoionization by demonstrating that orbital angular momentum from structured light is predominantly transferred to the recoiling proton rather than directly to ejected electrons. This discovery corrects long-standing fixed-target approximations and highlights the necessity of accounting for full translational dynamics when analyzing fundamental light-matter interactions at atomic scales.

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Researchers Link Hydrogen Ionisation Recoil to Orbital Momentum

Quantum ZeitgeistSeptember 16, 20264 min read

Previous models predicted light’s orbital angular momentum directly excited emitted electrons during ionization. However, this work demonstrates that finite-retardation effects actually redirect much of that momentum into proton recoil instead. Consequently, understanding how light interacts with matter now demands accounting for full translational dynamics, not just fixed target approximations.

A new theoretical framework explains how structured light transfers angular momentum to atoms during ionization. The theory reveals that when hydrogen is ionized by Laguerre, Gaussian beams carrying orbital angular momentum, much of this momentum shifts to the recoiling proton rather than directly to the emitted electron as previously thought. Understanding of how ‘twisted’ light interacts with atoms during ionization processes has refined itself. The discovery shows much of this twisting force isn’t transferred directly to ejected electrons; instead it moves…

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