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arxiv: 2606.09011 · v1 · pith:MXACVERZnew · submitted 2026-06-08 · ⚛️ physics.chem-ph

Static Electric Fields as a Model for Hydrogen-Bond-Induced Dissociation of HF and HCl

Megan Grace , Avdhoot Datar This is my paper

Pith reviewed 2026-06-27 14:55 UTC · model grok-4.3

classification ⚛️ physics.chem-ph
keywords electric fieldsHFHCldissociationpotential energy surfacespolarizabilityacid strengthhydrogen bonding
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The pith

Static electric fields dissociate HCl at 450 MV/cm but require 700 MV/cm for HF, modeling hydrogen-bond effects on acidity.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper computes ground- and excited-state potential energy surfaces for HF and HCl as functions of bond length and applied static electric field strength using quantum chemical methods. It finds that HCl's ground-state surface turns fully dissociative near 450 MV/cm while HF needs nearly 700 MV/cm, a difference traced to HCl's higher polarizability and less localized bonding. The calculations treat the uniform external field as a stand-in for the local fields produced by hydrogen-bond networks, thereby linking molecular response to macroscopic acid strength differences between the two halides.

Core claim

The calculations reveal that the ground-state PES of HCl becomes entirely dissociative at field strengths of approximately 450 MV/cm, whereas HF requires a substantially stronger field of nearly 700 MV/cm to induce dissociation. This difference reflects the greater polarizability and weaker bond localization in HCl relative to HF, providing a molecular-scale perspective on the contrasting macroscale acid strengths of the two species. Field-dependent dipole moments further demonstrate the stronger electronic response of HCl to external perturbations.

What carries the argument

Ground- and excited-state potential energy surfaces computed as a function of internuclear distance and external electric field strength via quantum chemical calculations.

Load-bearing premise

A uniform static external electric field accurately represents the local, inhomogeneous, and time-varying fields created by hydrogen-bond networks in condensed phases.

What would settle it

Experimental observation of whether a uniform field near 450 MV/cm fully dissociates gas-phase or matrix-isolated HCl while the same field leaves HF bound.

Figures

Figures reproduced from arXiv: 2606.09011 by Avdhoot Datar, Megan Grace.

Figure 1
Figure 1. Figure 1: Schematic representation of the molecular orientation and direction of the applied [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Potential energy scans for the ground and lowest excited electronic states of HF [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Potential energy scans for the ground and lowest excited electronic states of HCl [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Dipole moments of HF and HCl molecules evaluated for variable electric field [PITH_FULL_IMAGE:figures/full_fig_p010_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: HOMO–LUMO energy gaps for HF and HCl molecules calculated at variable [PITH_FULL_IMAGE:figures/full_fig_p012_5.png] view at source ↗
read the original abstract

The influence of static electric fields on the electronic structure and dissociation behavior of the polar diatomics \ce{HF} and \ce{HCl} is investigated using quantum chemical calculations. Ground- and excited-state potential energy surfaces (PESs) are computed as a function of bond distance and external electric field strength to examine field-induced modifications of chemical bonding. The calculations reveal pronounced bond softening and progressive destabilization of both molecules with increasing field intensity. Notably, the ground-state PES of \ce{HCl} becomes entirely dissociative at field strengths of approximately 450 MV/cm, whereas \ce{HF} requires a substantially stronger field of nearly 700 MV/cm to induce dissociation. This difference reflects the greater polarizability and weaker bond localization in \ce{HCl} relative to \ce{HF}, providing a molecular-scale perspective on the contrasting macroscale acid strengths of the two species. Field-dependent dipole moments further demonstrate the stronger electronic response of \ce{HCl} to external perturbations, highlighting how molecular polarizability drives electric-field-induced bond activation. Ultimately, these results map out a detailed picture of field-controlled dissociation in hydrogen halides, supporting the view that local electric fields generated by surrounding hydrogen-bonding networks play a key role in modulating bond activation and condensed-phase acidity.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript reports quantum chemical calculations of the ground- and excited-state potential energy surfaces of HF and HCl as functions of internuclear distance and applied uniform static electric field. It finds that the HCl ground-state PES becomes entirely dissociative near 450 MV/cm while the HF surface requires nearly 700 MV/cm, attributes the difference to greater polarizability and weaker bond localization in HCl, and interprets the uniform-field thresholds as a molecular-scale model for hydrogen-bond-induced dissociation that explains the contrasting condensed-phase acid strengths of the two molecules.

Significance. If the uniform-field results are shown to be transferable to inhomogeneous, fluctuating hydrogen-bond fields and if the computational details are supplied, the work would supply a concrete, falsifiable link between molecular polarizability and macroscopic acidity. No machine-checked proofs, open code, or parameter-free derivations are described, so the primary strength would lie in the numerical mapping of field-dependent PESs rather than in methodological novelty.

major comments (2)
  1. [Abstract] Abstract: the dissociation thresholds of approximately 450 MV/cm (HCl) and 700 MV/cm (HF) are presented as central quantitative results, yet the abstract supplies no level of theory, basis-set specification, convergence criteria, or validation against known zero-field bond lengths or dissociation energies. These omissions are load-bearing because the claimed difference in field strength is the sole quantitative support for the polarizability-based explanation of acid-strength ordering.
  2. [Abstract] Abstract: the claim that uniform static fields serve as a model for hydrogen-bond-induced dissociation rests on the untested assumption that a spatially constant, time-independent field reproduces the bond-softening physics of the position-dependent and fluctuating fields inside real H-bond networks. No embedded-cluster, QM/MM, or explicit-solvent calculations are referenced to test transferability, rendering the interpretive link to macroscale acidity an extrapolation rather than a demonstrated result.
minor comments (1)
  1. [Abstract] Abstract: the statement that field-dependent dipole moments "demonstrate the stronger electronic response of HCl" is asserted without any numerical values, plots, or comparison to the HF dipole response, leaving the supporting evidence for the polarizability argument unquantified.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive and detailed comments. We address each major point below and have revised the manuscript to improve clarity and transparency while preserving the scope of the original study.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the dissociation thresholds of approximately 450 MV/cm (HCl) and 700 MV/cm (HF) are presented as central quantitative results, yet the abstract supplies no level of theory, basis-set specification, convergence criteria, or validation against known zero-field bond lengths or dissociation energies. These omissions are load-bearing because the claimed difference in field strength is the sole quantitative support for the polarizability-based explanation of acid-strength ordering.

    Authors: We agree that the abstract must specify the computational details to support the reported thresholds. In the revised manuscript we have updated the abstract to state the level of theory, basis set, and convergence criteria used, together with a brief statement confirming that the zero-field bond lengths and dissociation energies match established experimental and benchmark values. These specifications were already present in the Methods section and are now also included in the abstract. revision: yes

  2. Referee: [Abstract] Abstract: the claim that uniform static fields serve as a model for hydrogen-bond-induced dissociation rests on the untested assumption that a spatially constant, time-independent field reproduces the bond-softening physics of the position-dependent and fluctuating fields inside real H-bond networks. No embedded-cluster, QM/MM, or explicit-solvent calculations are referenced to test transferability, rendering the interpretive link to macroscale acidity an extrapolation rather than a demonstrated result.

    Authors: We accept that the uniform-field model is a simplification and that explicit tests of transferability to inhomogeneous, fluctuating hydrogen-bond fields are not performed in this work. The manuscript presents the uniform field as a controlled, interpretable proxy for isolating the effect of electric fields on bond dissociation rather than as a direct simulation of condensed-phase environments. In the revision we have added an explicit paragraph in the Discussion section that states the modeling assumptions, notes the absence of QM/MM validation, and cites literature on local electric fields in hydrogen-bonded systems to support the qualitative analogy. We view this as a partial revision because new explicit-solvent calculations lie outside the present scope. revision: partial

Circularity Check

0 steps flagged

No circularity; direct quantum-chemical outputs with interpretive perspective

full rationale

The paper computes ground- and excited-state PES(r, E) for HF and HCl via standard quantum-chemical methods under uniform external fields. Dissociation thresholds (~450 MV/cm for HCl, ~700 MV/cm for HF) are direct numerical results of these calculations, not quantities obtained by fitting a parameter to a subset of the same data and then re-predicting it. No self-citations are invoked to justify uniqueness theorems or ansatzes that close the central claim. The connection to condensed-phase acid strengths is explicitly labeled a 'perspective' rather than a derived equality. The modeling choice of a uniform static field is an assumption whose validity is external to the computation itself and does not reduce any reported number to its own input by construction. The derivation chain is therefore self-contained against external benchmarks of electronic-structure theory.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The work rests on standard assumptions of quantum chemistry without introducing new free parameters, axioms beyond domain norms, or invented entities.

axioms (1)
  • domain assumption Quantum chemical methods can reliably compute potential energy surfaces under applied static electric fields.
    Invoked implicitly by performing the PES calculations as a function of field strength.

pith-pipeline@v0.9.1-grok · 5754 in / 1214 out tokens · 43028 ms · 2026-06-27T14:55:47.864103+00:00 · methodology

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