What question did this study set out to answer?

The aim is to investigate the influence of shape resonances on the photodissociation dynamics of the hydrogen molecular ion (H2+).

February 5, 2026

UV photodissociation of H

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Explores photodissociation dynamics in hydrogen molecular ions, highlighting the impact of shape resonances on astrophysical modeling.

The aim is to investigate the influence of shape resonances on the photodissociation dynamics of the hydrogen molecular ion (H2+).
Used high-level ab initio calculations based on the MRDCI method to analyze electronic structure.
Calculated photodissociation cross sections under local thermodynamic equilibrium assumptions.
Considered photon wavelengths from 25 nm to dissociation threshold, analyzing contributions from rovibrational states.
Focused on the effects of shape resonances, particularly near the Lyman α spectral region.
Shape resonances significantly influence H2+ photodissociation dynamics, especially near the Lyman α line.
The contributions from the 12Πu excited state notably alter spectral absorption features around the Lyman α region.
The refined cross-sectional data improves upon previous datasets, aiding astrophysical models and simulations.

Yang et al. (2025) studied this question.

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