Argon–Krypton Electron Gain Enthalpy Investigation
Atomic Physics • Electron Scattering • Physical Chemistry
Literature
This investigation is grounded in the primary scientific literature wherever possible.
Rather than relying solely on modern summaries or educational resources, the project prioritizes original experimental papers, theoretical developments, and major review articles. Each source is examined to determine not only what conclusions it reaches, but also how those conclusions were obtained and how they influenced later work.
This page serves as a living bibliography documenting the literature reviewed during the course of the investigation.
Primary Literature
Electron Affinity Literature
These papers form the historical foundation of the electron-affinity investigation.
Pritchard (1953)
Status: Reviewed
Purpose
One of the earliest investigations considered during the historical search for the origin of the reported electron gain enthalpy values.
Findings
🟢 No positive electron affinity assigned to argon.
🟢 Krypton is not discussed.
🟢 Stable negative ions were not experimentally established.
Importance
This paper eliminated one of the earliest suspected sources of the commonly reported textbook values.
Berry (1969)
Status: Reviewed
Purpose
Investigated as another possible historical source of the reported electron gain enthalpies.
Findings
🟢 No positive electron affinity assigned to argon.
🟢 Krypton is absent from the discussion.
🟢 Argon appears only in unrelated experimental contexts.
Importance
Confirmed that the commonly quoted values did not originate from this reference.
Hotop & Lineberger (1975)
Status: Reviewed
Purpose
Major review of atomic electron affinities.
Findings
🟢 Recommends:
EA(Ar) < 0
EA(Kr) < 0
No positive electron affinities are assigned.
Importance
Represents one of the strongest primary references supporting negative electron affinities for both atoms.
Hotop & Lineberger (1985)
Status: Reviewed
Purpose
Updated review of atomic electron affinities.
Findings
🟢 Continues to recommend:
EA(Ar) < 0
EA(Kr) < 0
🟢 Notes metastable excited negative-ion states without assigning stable ground-state electron affinities.
Importance
Confirms that even later comprehensive reviews did not support the commonly reported positive values.
Zollweg (1969)
Status: Planned
Purpose
Frequently cited as the basis for recommending negative electron affinities for argon, krypton, and xenon.
Research Goal
Determine whether this paper provides additional insight into the historical development of recommended electron-affinity values.
Scattering Theory
These papers establish the theoretical framework for low-energy electron scattering from atoms with long-range polarization potentials.
O'Malley, Spruch & Rosenberg (1961)
Status: Reviewed
Contribution
Develops the mathematical foundation for polarization scattering using modified Mathieu functions.
Importance
Serves as the principal theoretical reference against which the independent derivation is compared.
O'Malley, Rosenberg & Spruch (1962)
Status: Reviewed
Contribution
Applies the theoretical framework specifically to low-energy electron scattering.
Importance
Provides the threshold expansion used throughout later work.
O'Malley (1963)
Status: Reviewed
Contribution
Applies the theory to experimental electron scattering from rare-gas atoms.
Importance
Connects the mathematical framework with observable scattering behavior, including the Ramsauer–Townsend minimum.
Gao (1998)
Status: Reviewed
Contribution
Introduces a modern quantum-defect treatment for long-range interactions.
Gao (2013)
Status: Reviewed
Contribution
Extends Quantum Defect Theory for the -1/r⁴ interaction.
Idziaszek & Julienne (2011)
Status: Reviewed
Contribution
Develops MQDT methods for ultracold atom–ion collisions.
Fedus et al. (2013)
Status: Reviewed
Contribution
Modern analytic treatment of Modified Effective Range Theory.
Secondary Sources
The following materials are being investigated to trace the historical propagation of the reported electron gain enthalpy values.
Planned
- NCERT (multiple editions)
- J. D. Lee
- Greenwood & Earnshaw
- CRC Handbook
- Lange's Handbook
- Older chemistry data compilations
- Educational reference tables
These sources are expected to help reconstruct the citation genealogy of the commonly quoted +96 kJ/mol value.
Literature Strategy
Every source is evaluated using the same questions:
- Does it discuss argon?
- Does it discuss krypton?
- Are numerical electron affinities reported?
- Are the values experimental, theoretical, or estimated?
- What earlier references are cited?
- How does the source influence later literature?
Applying a consistent review process makes it easier to compare papers published decades apart while maintaining an objective record of the investigation.