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Open research questions in Advanced Chemical Physics Studies

65 unresolved questions extracted from the limitations and future-work sections of 267 Advanced Chemical Physics Studies papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The lack of a direct observable physical surface for atoms. The need for a comprehensive audit of atomic radius variation across the periodic table. The complexity of the relationships between different radius definitions.

    The Holland Atom II: Atomic Radius Variation and Shell-Band Geometry · 2026 · DOI

  • The study focuses on a specific type of catalyst (Pt). The calculations are limited to a specific level of theory (PBE-D3(BJ)). The study does not consider other types of surface reactions.

    Molecular reference corrections for quantum Monte Carlo adsorption energies · 2026 · DOI

  • Further studies can be conducted to apply the molecular correction scheme to other types of catalysts and surface reactions. The study's findings can be used to inform the design of more efficient catalysts.

    Molecular reference corrections for quantum Monte Carlo adsorption energies · 2026 · DOI

  • Locating transition states with standard atomistic simulation software is a fundamental task for both theoretical and experimental researchers. Double-ended methods are a major class of approaches for locating reaction paths and transition states.

    PyDMF: A Python package for variational double-ended reaction-path and transition-state optimization · 2026 · DOI

  • The method uses a point-like orbital approximation, which may not be suitable for all materials. The approach is limited to 2D materials, and may not be applicable to other systems.

    Microscopic screening theory for excitons in two-dimensional materials: a bridge between effective models and ab initio descriptions · 2026 · DOI

  • To apply the method to other 2D materials and systems. To extend the approach to other dimensions and systems. To study the optical properties of 2D materials using the developed method.

    Microscopic screening theory for excitons in two-dimensional materials: a bridge between effective models and ab initio descriptions · 2026 · DOI

  • The approach is limited to a specific type of system. The number of off-diagonal elements to evaluate is incredibly large.

    Richardson–Gaudin states of non-zero seniority. III. The perfect-pairing limit · 2026 · DOI

  • To further develop the approach and apply it to larger systems. To explore the use of Richardson-Gaudin states in other areas of research.

    Richardson–Gaudin states of non-zero seniority. III. The perfect-pairing limit · 2026 · DOI

  • Hydrogen (H 2 ) is a promising carbon–neutral energy carrier; however, its deployment is limited by the lack of lightweight, reversible storage media that operate under practical conditions.

    N-graphdiyne as a tunable platform for stabilizing light metals toward high-capacity reversible hydrogen storage · 2026 · DOI

  • On Lennard‐Jones clusters, the unmodified BO framework becomes unreliable beyond LJ 13 , and local relaxation with similarity filtering alone remains insufficient for the double‐funnel LJ 38 benchmark, reaching the global minimum only six times in 25 runs.

    Physically Informed Population Initialization Improves Bonobo Optimizer Searches for Atomic Cluster Global Minima · 2026 · DOI

  • The role of subvalence correlation in improving reference geometry and post-CCSD(T) contributions has been investigated, but broader theoretical understanding of when these effects become significant across the periodic table remains incomplete.

    Coupling between Thermochemical Contributions of Subvalence Correlation and of Higher-Order Post-CCSD(T) Correlation Effects─A Step toward “W5 Theory” · 2026 · DOI

  • Post-CCSD(T) subvalence correlation contributions can exceed 0.5 kcal/mol for second-row systems with adjacent second-row atoms, but the paper does not provide a comprehensive framework for systematically predicting or correcting for these effects.

    Coupling between Thermochemical Contributions of Subvalence Correlation and of Higher-Order Post-CCSD(T) Correlation Effects─A Step toward “W5 Theory” · 2026 · DOI

  • Further studies are needed to investigate the electronic structural properties of other halogen-bonded complexes. The development of new methods for calculating the IR intensity of vibrational modes in complex molecular systems is necessary.

    Electronic Structural Analysis of the Infrared Intensity Generation and Enhancement Occurring upon Formation of the Bis(Pyridine)Iodonium Cation · 2026 · DOI

  • The electronic structural properties of the bis(pyridine)iodonium cation are not well understood. The role of vibration-induced partial transfer of electron density in the IR intensity generation of the antisymmetric stretching vibration is not clear.

    Electronic Structural Analysis of the Infrared Intensity Generation and Enhancement Occurring upon Formation of the Bis(Pyridine)Iodonium Cation · 2026 · DOI

  • The highly fluxional nature of CH5+. The anharmonic effects in the molecule. The need for a more accurate and efficient numerical method for molecular spectroscopy.

    Neural canonical transformation for the spectra of fluxional molecule CH <sub>5</sub> <sup>+</sup> · 2026 · DOI

  • The NCT method may require significant computational resources. The method is limited to the study of vibrational spectra. The work does not provide a direct comparison with experimental results.

    Neural canonical transformation for the spectra of fluxional molecule CH <sub>5</sub> <sup>+</sup> · 2026 · DOI

  • While spin-adapted time-dependent density functional theory (TDDFT) approaches significantly improve the excitation energies and gradients of open-shell molecules, the effect of spin-adaptation on nonadiabatic coupling matrix elements (NACMEs) remains unknown for spin-conserving excitations.

    Analytic first order nonadiabatic coupling matrix elements of spin-adapted open-shell time-dependent density functional theory · 2026

  • To develop a spacetime and Lorentz covariant theoretical framework. To study the back-reaction of the field on the spacetime geometry. To explore the implications of the results for chemistry in strong gravitational fields.

    The [3+1] Formulation of Chemical Dynamics in Curved Spacetime under an Eulerian Observer · 2026 · DOI

  • The traditional theory of chemistry in flat spacetime is not sufficient for systems in strong gravitational fields. There is a need to develop a theoretical framework for chemical dynamics in curved spacetime. There is a need to study the effects of spacetime curvature on molecular properties.

    The [3+1] Formulation of Chemical Dynamics in Curved Spacetime under an Eulerian Observer · 2026 · DOI

  • The def2-SVP basis is defined for Iridium only together with its ECP, so an all-electron treatment in this basis is ill-defined rather than merely approximate. The workflow is currently limited to a specific type of catalyst and adsorbate.

    A Reproducible Workflow for Extracting Quantum Hamiltonians from Surface-Adsorbate Models · 2026 · DOI

  • The gap between realistic surface-catalysis models from density functional theory and the many-body Hamiltonian inputs required by quantum algorithms remains a practical obstacle. Few studies have explored the application of quantum algorithms to hydrogen evolution on Iridium-based catalysts.

    A Reproducible Workflow for Extracting Quantum Hamiltonians from Surface-Adsorbate Models · 2026 · DOI

  • The practical use of local hybrids for large systems is limited by computational cost. The cost of evaluating exact-exchange quantities self-consistently is a major limitation.

    An Energy‐Corrected Fast Post‐ <scp>SCF</scp> Local‐Hybrid Scheme for Highly Accurate Energy Differences of Large Main‐Group Systems · 2026 · DOI

  • Prior software for calculating relaxation rates typically rely on proprietary software and require deep understanding of the underlying quantum mechanics. There is a need for a convenient and efficient means for symbolic and numerical evaluation of relaxation rates.

    RelCalc: symbolic evaluation of BWR theory relaxation rates in python, applications to TROSY effects in AX$$_n$$ spin systems · 2026 · DOI

  • Further investigation of the hierarchical organisation of radius measurements. Exploration of the potential for the various accepted radius definitions to sample different regions within a finite shell envelope.

    The Holland Atom II: Atomic Radius Variation and Shell-Band Geometry · 2026 · DOI

  • Further study of alternative pathways for interstellar abundances. Investigation of the role of dust-grain surface chemistry in nitrile and isonitrile formation.

    Computational investigation of interstellar C4H3N isomers formation via propargyl and cyano radical association · 2026 · DOI

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65 open questions have been extracted from the limitations and future-work passages of 267 Advanced Chemical Physics Studies papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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