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Open research questions in Advanced Chemical Physics Studies

122 gap statements mined from Advanced Chemical Physics Studies papers in our 4.5M-paper local library, which holds 1,021 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The lack of accurate total atomization energies for second-row species. The need for a computational protocol that can achieve an accuracy of 1 kJ/mol or better for second-row species.

    Coupling between Thermochemical Contributions of Subvalence Correlation and of Higher-Order Post-CCSD(T) Correlation Effects─A Step toward “W5 Theory” · 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 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 5 + · 2026 · DOI

  • The research aims to address this gap by investigating the electronic distribution of a molecular domain using the Quantum Expectation Identity theorem.

    Quantum Expectation Identities for the Three-State Model of a Molecular Domain · 2026

  • 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

  • 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

  • Determining the on-site Coulomb parameter (U) is essential for the GGA+U approach. The need to construct a suitable supercell to achieve a set of linearly independent total-energy equations. The challenge of achieving a balance between computational cost and accuracy in determining magnetic exchange interactions.

    Benchmarking first-principles approaches for extracting magnetic exchange interactions · 2026 · DOI

  • The need for accurate and efficient determination of magnetic exchange interactions. The lack of a systematic comparison of different approaches for extracting magnetic exchange interactions. The need for a general, reproducible, and scalable workflow for Heisenberg mapping.

    Benchmarking first-principles approaches for extracting magnetic exchange interactions · 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‐ SCF Local‐Hybrid Scheme for Highly Accurate Energy Differences of Large Main‐Group Systems · 2026 · DOI

  • 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 lack of understanding of alternative pathways for nitrile and isonitrile formation.

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

  • The lack of a practical approach to extend regular KS-DFT beyond the Born-Oppenheimer approximation. The need for a correlated electro-nuclear framework to account for nuclear quantum effects. The importance of treating correlations induced by second-order geometrical derivatives.

    Exactly Factorized Molecular Kohn–Sham Density Functional Theory · 2026 · DOI

  • The proposed approach is limited to systems where the density can be accurately described by a functional of the potential. The use of Taylor expansions can be limited by the accuracy of the model system.

    Designing explicit functionals for the charge density in terms of a potential · 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

  • The study only considers a limited set of molecular fragments. The calculations are performed at the CCSD(T) level, which may not be sufficient for all systems.

    On the transferability of pure electron correlation of quantum topologically defined molecular fragments at the CCSD(T) level · 2026 · DOI

  • 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

  • Future developments include automated orbital freezing and Hamiltonian reduction techniques to further lower qubit requirements, as well as tighter integration with quantum algorithms such as VQE. We also plan to extend the workflow to additional catalytic systems, charged clusters, and more realistic electrochemical environments.

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

  • The application of the IQA method to a wider range of systems. The development of more accurate force fields using the IQA method. The exploration of the use of the IQA method at higher levels of theory.

    On the transferability of pure electron correlation of quantum topologically defined molecular fragments at the CCSD(T) level · 2026 · DOI

  • The UCC3 method has incomplete treatment of single excitations, - The calculation of second and higher-order properties is not reported, - The work is limited to the calculation of first-order…

    Relativistic unitary coupled-cluster method for ground-state molecular properties · 2026 · DOI

  • Extending the unitary coupled cluster method to second- and higher-order properties, - Investigating the performance of the qUCCSD method for larger…

    Relativistic unitary coupled-cluster method for ground-state molecular properties · 2026 · DOI

  • The method is limited to solving the vibrational Schrödinger equation for realistic polyatomic molecules, - The approach has only been demonstrated for methane and propane molecules, - The number of training points is limited to fewer…

    Solving the vibrational Schrödinger equation with artificial neural networks · 2026 · DOI

  • Further development of methods that aim to reliably describe NLX, - Investigation of the applicability of the tX measure to other systems, - Development of more accurate and efficient methods for calculating…

    A Molecular “Thermometer” for Measuring Effective Non‐Local Exchange · 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

  • Further development of the proposed approach to improve its accuracy and efficiency. Application of the proposed approach to other systems and properties.

    Designing explicit functionals for the charge density in terms of a potential · 2026 · DOI

Most-cited papers in Advanced Chemical Physics Studies

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Open questions raised by papers listed on this page include: (1) The lack of accurate total atomization energies for second-row species (“Coupling between Thermochemical Contributions of Subvalence Correlation and of…”, 2026); (2) The electronic structural properties of the bis(pyridine)iodonium cation are not well understood (“Electronic Structural Analysis of the Infrared Intensity Generation and…”, 2026); (3) There is a need to develop a theoretical framework for chemical dynamics in curved spacetime (“The [3+1] Formulation of Chemical Dynamics in Curved Spacetime under an…”, 2026); (4) The lack of a systematic comparison of different approaches for extracting magnetic exchange interactions (“Benchmarking first-principles approaches for extracting magnetic exchange…”, 2026); (5) The lack of understanding of alternative pathways for nitrile and isonitrile formation (“Computational investigation of interstellar C4H3N isomers formation via…”, 2026). 122 gap statements have been mined from Advanced Chemical Physics Studies papers in our 4.5M-paper local library, which holds 1,021 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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