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Atomic and Molecular Physics
Research Guide
What is Atomic and Molecular Physics?
Atomic and Molecular Physics is the branch of physics that studies the structure, dynamics, and interactions of atoms and molecules, especially as governed by electronic structure and interactions with particles, photons, and external fields.
The Atomic and Molecular Physics literature cluster contains 166,050 works focused on topics including low-energy electron interactions with matter, atomic structure, quantum electrodynamics, radiative recombination, and positron–molecule interactions. Core methodological foundations in this area include density-functional approximations, pseudopotentials, and basis-set constructions used to compute atomic and molecular electronic structure. Widely cited computational formalisms include the density-functional correlation functional introduced in "Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density" (1988) and the all-electron electronic-structure framework in "Projector augmented-wave method" (1994).
Topic Hierarchy
Research Sub-Topics
Quantum Electrodynamics in Atoms
This sub-topic computes QED corrections to atomic energy levels, Lamb shifts, and hyperfine structure. Researchers test fundamental constants using high-precision spectroscopy.
Antihydrogen Production and Spectroscopy
This sub-topic details trap-based synthesis, cooling, and laser spectroscopy of antihydrogen for CPT tests. Experiments at CERN's AEgIS and ALPHA compare it to hydrogen.
Radiative Recombination Processes
This sub-topic models electron-ion radiative capture cross-sections and rate coefficients in plasmas. Applications include astrophysical and fusion diagnostics.
Positron-Molecule Interactions
This sub-topic studies positron scattering, annihilation, and positronium formation with molecules. Researchers measure cross-sections for vibrational excitation and attachment.
Electron Attachment Dynamics
This sub-topic investigates dissociative electron attachment in polyatomics, relevant to radiation damage. Threshold laws and isotope effects are analyzed experimentally and theoretically.
Why It Matters
Atomic and molecular physics underpins quantitative prediction and interpretation of molecular properties that are directly used in chemical modeling, spectroscopy, and materials simulation workflows. For example, Lee, Yang, and Parr (1988) in "Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density" provided a practical density-functional correlation form that became a standard ingredient in electronic-structure calculations used to compute molecular energies and response properties. Blöchl (1994) in "Projector augmented-wave method" described a method that generalizes pseudopotentials and LAPW to enable high-quality first-principles molecular-dynamics calculations, which are central to simulating atomic-scale structure and dynamics in solids and molecules. In molecular interaction and spectroscopy contexts, Boys and Bernardi (1970) in "The calculation of small molecular interactions by the differences of separate total energies. Some procedures with reduced errors" introduced procedures to reduce errors in computed interaction energies, supporting more reliable modeling of weak intermolecular forces relevant to molecular complexes and condensed phases. Practical atomic-to-molecular modeling also depends on reusable representations of core electrons and orbital spaces, such as Hay and Wadt (1985) in "Ab initio effective core potentials for molecular calculations. Potentials for the transition metal atoms Sc to Hg" and Andrae et al. (1990) in "Energy-adjustedab initio pseudopotentials for the second and third row transition elements", which facilitate tractable calculations for transition-metal systems.
Reading Guide
Where to Start
Start with "The calculation of small molecular interactions by the differences of separate total energies. Some procedures with reduced errors" (1970) because it introduces a concrete, widely used idea—error reduction in interaction energies—that is easy to connect to practical calculations of molecular complexes.
Key Papers Explained
A typical computational pipeline can be organized around five linked building blocks. Boys and Bernardi (1970), "The calculation of small molecular interactions by the differences of separate total energies. Some procedures with reduced errors", addresses how to compute interaction energies reliably from total-energy differences. Basis sets then provide the orbital representation, with McLean and Chandler (1980), "Contracted Gaussian basis sets for molecular calculations. I. Second row atoms, Z=11–18", and Schäfer, Horn, and Ahlrichs (1992), "Fully optimized contracted Gaussian basis sets for atoms Li to Kr", supplying widely used contracted Gaussian constructions. For heavy elements, core–valence separation is handled by Hay and Wadt (1985), "Ab initio effective core potentials for molecular calculations. Potentials for the transition metal atoms Sc to Hg", and Andrae et al. (1990), "Energy-adjustedab initio pseudopotentials for the second and third row transition elements". Finally, electronic-structure accuracy and efficiency are shaped by the exchange–correlation approximation and the all-electron/pseudopotential framework, with Lee, Yang, and Parr (1988), "Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density", and Blöchl (1994), "Projector augmented-wave method", providing two of the most influential components.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
From the provided topic description, current frontiers include quantitatively modeling low-energy electron interactions with matter (including DNA strand breaks), positron–molecule interactions, radiative recombination, and precision studies of hydrogen-like atoms and related few-body systems. Advanced work in this area typically combines carefully chosen basis sets (e.g., "Fully optimized contracted Gaussian basis sets for atoms Li to Kr" (1992)), core treatments for heavy elements (e.g., "Ab initio effective core potentials for molecular calculations. Potentials for the transition metal atoms Sc to Hg" (1985)), and robust electronic-structure frameworks (e.g., "Projector augmented-wave method" (1994)) to control systematic errors across diverse atomic and molecular regimes.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Development of the Colle-Salvetti correlation-energy formula i... | 1988 | Physical review. B, Co... | 98.2K | ✕ |
| 2 | Projector augmented-wave method | 1994 | Physical review. B, Co... | 86.4K | ✕ |
| 3 | The calculation of small molecular interactions by the differe... | 1970 | Molecular Physics | 21.6K | ✕ |
| 4 | C60: Buckminsterfullerene | 1985 | Nature | 15.7K | ✕ |
| 5 | <i>Ab initio</i> effective core potentials for molecular calcu... | 1985 | The Journal of Chemica... | 13.5K | ✕ |
| 6 | Contracted Gaussian basis sets for molecular calculations. I. ... | 1980 | The Journal of Chemica... | 9.5K | ✕ |
| 7 | Fully optimized contracted Gaussian basis sets for atoms Li to Kr | 1992 | The Journal of Chemica... | 9.4K | ✕ |
| 8 | THE STOPPING AND RANGE OF IONS IN SOLIDS | 1988 | Elsevier eBooks | 9.1K | ✕ |
| 9 | Electron paramagnetic resonance of transition ions | 1970 | — | 9.0K | ✕ |
| 10 | Energy-adjustedab initio pseudopotentials for the second and t... | 1990 | Theoretica Chimica Acta | 8.3K | ✕ |
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Code & Tools
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The cold-atoms library is a tool box for the simulation of ensembles of neutral atoms or ions for atomic, molecular, and optical physics (AMO) expe...
## About VeloxChem is a Python-based open source quantum chemistry software developed for computing molecular properties and a variety of spectros...
atomphys is meant to be a good starting off point for your atomic physics calculations. It can automate much of the frustrating process of searchin...
## Repository files navigation ## Python-based Simulations of Chemistry Framework Build Status codecov 2025-03-20
Recent Preprints
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Latest Developments
Recent developments in atomic and molecular physics research include studies on quantum magnetic J-oscillators and constraints on axion dark matter (January 2026) (Nature), advancements in water autodissociation influenced by electric fields (January 2026) (ScienceDaily), and the observation of long-lived giant circular Rydberg atoms at room temperature (December 2025) (arXiv). Additionally, upcoming conferences such as Atomic Physics 2026 and the International Summit on Applied & Theoretical Physics are highlighting ongoing research efforts (conference-service, physics.unitedscientificgroup.org).
Sources
Frequently Asked Questions
What is Atomic and Molecular Physics primarily concerned with?
Atomic and molecular physics primarily concerns the structure and dynamics of atoms and molecules and how they interact with particles, photons, and external fields. In the provided topic description, representative problems include low-energy electron interactions with matter, electron attachment, radiative recombination, and positron–molecule interactions.
How are electronic-structure calculations commonly performed in atomic and molecular physics?
Electronic-structure calculations are commonly performed using density-functional methods, basis-set expansions, and pseudopotential or all-electron frameworks. "Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density" (1988) provides a widely used density-based correlation functional form, and "Projector augmented-wave method" (1994) provides an approach that generalizes pseudopotentials and LAPW for high-quality first-principles calculations.
Why do researchers use counterpoise-type procedures when computing molecular interaction energies?
Researchers use counterpoise-type procedures to reduce systematic errors when computing interaction energies from differences of separate total energies. Boys and Bernardi (1970) in "The calculation of small molecular interactions by the differences of separate total energies. Some procedures with reduced errors" presented procedures intended to strongly reduce the error of the interaction energy.
Which papers in the provided list are most central for practical basis sets in molecular calculations?
Two central basis-set resources in the provided list are "Contracted Gaussian basis sets for molecular calculations. I. Second row atoms, Z=11–18" (1980) and "Fully optimized contracted Gaussian basis sets for atoms Li to Kr" (1992). These works focus on constructing contracted Gaussian basis sets and optimizing their parameters for use in atomic and molecular calculations.
How do effective core potentials and pseudopotentials support atomic and molecular modeling of transition metals?
Effective core potentials and pseudopotentials replace explicit treatment of chemically inert core electrons to reduce computational cost while retaining valence accuracy. Hay and Wadt (1985) in "Ab initio effective core potentials for molecular calculations. Potentials for the transition metal atoms Sc to Hg" generated ECPs for Sc to Hg, and Andrae et al. (1990) in "Energy-adjustedab initio pseudopotentials for the second and third row transition elements" presented energy-adjusted pseudopotentials for transition elements.
Which provided reference is a standard source for electron paramagnetic resonance (EPR) in atomic and molecular contexts?
"Electron paramagnetic resonance of transition ions" (1970) is a standard reference for EPR of transition ions. It emphasizes basic principles and provides extensive references to experimental results and detailed developments.
Open Research Questions
- ? How can density-based correlation functionals derived from forms like "Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density" (1988) be systematically improved while preserving broad transferability across atoms, molecules, and condensed phases?
- ? How can all-electron methods that generalize pseudopotentials and LAPW, as in "Projector augmented-wave method" (1994), be extended or adapted to maintain accuracy for strongly inhomogeneous electronic environments while remaining efficient for molecular dynamics?
- ? What is the best strategy to minimize residual basis-set and interaction-energy errors beyond the reduced-error procedures discussed in "The calculation of small molecular interactions by the differences of separate total energies. Some procedures with reduced errors" (1970) when modeling weak interactions in larger complexes?
- ? How should one choose between ECP-style approaches such as "Ab initio effective core potentials for molecular calculations. Potentials for the transition metal atoms Sc to Hg" (1985) and energy-adjusted pseudopotentials such as "Energy-adjustedab initio pseudopotentials for the second and third row transition elements" (1990) for predictive modeling across diverse transition-metal bonding situations?
Recent Trends
The provided dataset characterizes Atomic and Molecular Physics as a large research cluster of 166,050 works spanning low-energy electron interactions with matter, electron attachment, radiative recombination, positron–molecule interactions, and hydrogen-like atoms.
Within the highly cited methodological core, enduring trends include density-functional correlation modeling as in "Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density" , efficient high-accuracy electronic-structure frameworks as in "Projector augmented-wave method" (1994), and systematic control of interaction-energy errors as in "The calculation of small molecular interactions by the differences of separate total energies.
1988Some procedures with reduced errors".
1970Practical progress also depends on reusable computational ingredients—contracted Gaussian basis sets ("Contracted Gaussian basis sets for molecular calculations.
I. Second row atoms, Z=11–18" ; "Fully optimized contracted Gaussian basis sets for atoms Li to Kr" (1992)) and transition-metal core treatments ("Ab initio effective core potentials for molecular calculations.
1980Potentials for the transition metal atoms Sc to Hg" ; "Energy-adjustedab initio pseudopotentials for the second and third row transition elements" (1990))—that enable consistent modeling across atoms, molecules, and materials.
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