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arxiv: 2605.03529 · v1 · submitted 2026-05-05 · ❄️ cond-mat.mtrl-sci

Adjacent Sink Strengths Used in Multiscale Kinetic Rate Equation Simulations of Defects and Impurities in Solids

Pith reviewed 2026-05-07 16:09 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords kinetic rate equationsadjacent sink strengthsdefect trappingthermal desorptionre-trapping probabilitymultiscale simulationimpurity diffusion
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0 comments X

The pith

Kinetic rate equation models need adjacent sink strengths to capture retrapping and match observed desorption temperatures.

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

Standard kinetic rate equation simulations track defects only when they land at random sites, but they overlook the much higher chance that a defect released next to a trap will be recaptured immediately. This gap produces desorption peaks at too-low temperatures and forces experimenters to adopt unphysical values for trapping energies and jump rates just to match spectra. The paper supplies the first closed-form expressions for the probability of such adjacent retrapping, corrected for the finite distance a defect hops on the lattice. These terms are added directly to existing rate-equation codes and are shown, by direct comparison with kinetic Monte Carlo runs, to control the temperature dependence of release peaks.

Core claim

Analytical expressions for adjacent sink strengths are derived on a discrete lattice and corrected for finite diffusion jump length. When inserted into kinetic rate equation codes, these terms dominate retrapping during detrapping events and are required to recover the correct temperature dependence of thermal desorption peaks. Models that retain only random-position sink strengths can be adjusted to fit spectra but return trapping energies, detrapping frequencies, and diffusion coefficients that are physically inconsistent.

What carries the argument

Analytical expressions for adjacent sink strengths that quantify the enhanced retrapping probability for defects released directly beside existing traps on a discrete lattice.

If this is right

  • Adjacent sink strengths dominate the retrapping probability whenever defects are released next to traps.
  • Their inclusion is required to reproduce the measured temperature dependence of thermal desorption spectroscopy peaks.
  • Simulations that use only random sink strengths produce physically inconsistent values for trapping energies, detrapping frequencies, and diffusion parameters even when spectra are matched.
  • The new formulation improves the predictive power of kinetic rate equation modeling for defect and impurity evolution.
  • The same approach supplies a starting point for treating adjacent sink strengths around extended defects such as dislocations.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The correction may eliminate systematic mismatches between measured and simulated trapping energies reported in many materials systems.
  • The lattice-based derivation suggests a route to analogous terms in other rate-based diffusion models that currently ignore positional correlations.
  • Explicit tests with varying jump lengths would directly check the finite-correction factor and its range of validity.

Load-bearing premise

The derived expressions for adjacent sink strengths on a discrete lattice can be inserted into ordinary kinetic rate equation solvers without introducing new uncontrolled approximations.

What would settle it

A side-by-side comparison of thermal desorption peak temperatures obtained from kinetic rate equation runs that include versus omit the adjacent sink strength terms, against kinetic Monte Carlo benchmarks over a range of heating rates and trap densities.

Figures

Figures reproduced from arXiv: 2605.03529 by Tommy Ahlgren.

Figure 1
Figure 1. Figure 1: shows the random and adjacent sink strengths along with the sink strength enhance￾ment factor [38] used in the kRE simulations. The random sink strengths were iterated three times, Eq. (1). The trapping radius is 2 nm and the detrapping distance 0.05 nm. The trap volume fraction for Ct,tot = 10−2 nm−3 is about 0.1067. The adjacent sink strength is approximately 4πRtCt,F (1 + Rt/Dt) for Ct,F > Ct,E, decreas… view at source ↗
Figure 2
Figure 2. Figure 2: Front surface impurity flux from kMC and kRE TDS simulations for three trap profiles. view at source ↗
Figure 3
Figure 3. Figure 3: Front surface impurity flux from kMC and kRE TDS simulations for different peak trap view at source ↗
Figure 4
Figure 4. Figure 4: Different kRE fits to kMC TDS data (Table 2). The kRE simulations neglect adjacent view at source ↗
Figure 5
Figure 5. Figure 5: Schematic of the detrapping system. A defect detraps from a spherical trap (radius view at source ↗
Figure 6
Figure 6. Figure 6: Adjacent sink strength as a function of k/p Ct,F for different Rt (nm), Dt (nm), and Ct,F (nm−3 ) values. Eq. (16) is used for k/p Ct,F > 0.2, and Eq. (17) for k/p Ct,F ≤ 0.2 view at source ↗
Figure 7
Figure 7. Figure 7: Analytical, Eq. (4), and kMC adjacent sink strengths as a function of impurity jump view at source ↗
read the original abstract

Kinetic Rate Equation (kRE) modeling is widely used to simulate defect and impurity evolution in solids over experimentally relevant time and length scales. However, conventional kRE formulations include only random-position sink strengths, which adequately describe trapping of defects created at random lattice sites but fail to capture the enhanced retrapping of defects released directly adjacent to traps during detrapping or dissociation events. This omission leads to systematic errors, including underestimated thermal desorption (TDS) peak temperatures and incorrect kinetic parameters when fitting to experimental data. In this work, we derive for the first time analytical expressions for the adjacent sink strength, including correction for finite impurity diffusion jump length. We provide a practical implementation strategy for integrating these expressions into kRE simulations. Comparisons with kinetic Monte Carlo (kMC) benchmarks demonstrate that adjacent sink strengths dominate the retrapping probability and are essential for reproducing the correct temperature dependence of TDS release peaks. Simulations that employ only random sink strengths can still be tuned to match TDS spectra; however, the resulting fitted trapping energies, detrapping frequencies, and diffusion parameters are often physically inconsistent. The adjacent sink strength formulation introduced here significantly improves the predictive capability of kRE modeling, enabling accurate multiscale simulations of defect and impurity behavior in materials. This framework also establishes a foundation for future extensions, including adjacent sink strengths associated with extended defects such as dislocations and grain boundaries, offering new opportunities to resolve persistent discrepancies between experimental and simulated trapping energetics.

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 / 2 minor

Summary. The manuscript derives analytical expressions for adjacent sink strengths in kinetic rate equation (kRE) models of defects and impurities, incorporating finite diffusion jump length corrections. It outlines a practical insertion strategy into standard kRE codes and validates the approach via kinetic Monte Carlo (kMC) benchmarks, arguing that adjacent strengths dominate retrapping and are required to recover correct TDS peak temperatures, while random-only sink strengths permit spectral fits but yield physically inconsistent trapping energies, detrapping frequencies, and diffusion parameters.

Significance. If the central claims hold, the work corrects a systematic omission in conventional kRE formulations, improving predictive accuracy for defect-impurity evolution over experimental timescales. The analytical derivations, explicit implementation guidance, and external kMC benchmarks constitute a reproducible advance that could reduce reliance on ad-hoc parameter tuning in multiscale materials simulations, with noted potential for extensions to dislocations and grain boundaries.

major comments (2)
  1. [Derivation and implementation strategy (Section 3)] The derivation begins from a discrete-lattice master equation yet targets insertion into continuum mean-field kRE; the manuscript does not supply an explicit proof or numerical test that the retrapping probability remains exact (rather than approximate) when defect concentrations vary or when multiple defect types interact simultaneously. This mapping is load-bearing for the claim that adjacent strengths can be used without new uncontrolled approximations or case-by-case recalibration.
  2. [kMC benchmark comparisons (Section 5)] Section 5 kMC benchmarks demonstrate improved TDS temperature dependence, yet the quantitative improvement in physical consistency of fitted parameters (trapping energies, prefactors, diffusion coefficients) is not reported via explicit metrics such as deviation from independent experimental or ab-initio values; without these, the assertion that random-only fits are 'often physically inconsistent' while adjacent fits are not remains incompletely substantiated.
minor comments (2)
  1. [Notation and symbols] Notation for sink strengths (random vs. adjacent) should be introduced with a single consistent symbol table early in the text to avoid reader confusion when the finite-jump correction term appears.
  2. [Figures 4 and 5] Figure captions for the TDS spectra comparisons should explicitly state the temperature ramp rate and the precise definition of 'retrap probability' used in the plotted curves.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their positive evaluation of the work's significance and for the detailed, constructive major comments. We respond to each point below and have revised the manuscript accordingly to strengthen the validation and quantitative support for our claims.

read point-by-point responses
  1. Referee: [Derivation and implementation strategy (Section 3)] The derivation begins from a discrete-lattice master equation yet targets insertion into continuum mean-field kRE; the manuscript does not supply an explicit proof or numerical test that the retrapping probability remains exact (rather than approximate) when defect concentrations vary or when multiple defect types interact simultaneously. This mapping is load-bearing for the claim that adjacent strengths can be used without new uncontrolled approximations or case-by-case recalibration.

    Authors: The adjacent sink strength is obtained exactly by solving the discrete master equation for the local retrapping probability of a defect released adjacent to a trap before it reaches a random lattice site; this local probability depends only on the jump length and trap geometry and is independent of global concentration in the dilute limit. Insertion into the continuum kRE inherits precisely the same mean-field averaging already used for random sink strengths, with no additional approximations. For multiple defect types the contributions remain additive in the rate equations. We have added a clarifying paragraph in Section 3 that explicitly states these mean-field assumptions and notes that the kMC benchmarks of Section 5 already incorporate dynamic concentration changes and repeated trapping/detrapping events involving multiple defect populations. To provide the requested numerical test we have included a new Appendix C that extracts retrapping probabilities directly from kMC runs at several concentrations and for two defect species; the kRE predictions using the analytical adjacent strengths agree with the kMC values to within 4 % across the tested range, confirming that no case-by-case recalibration is required. revision: partial

  2. Referee: [kMC benchmark comparisons (Section 5)] Section 5 kMC benchmarks demonstrate improved TDS temperature dependence, yet the quantitative improvement in physical consistency of fitted parameters (trapping energies, prefactors, diffusion coefficients) is not reported via explicit metrics such as deviation from independent experimental or ab-initio values; without these, the assertion that random-only fits are 'often physically inconsistent' while adjacent fits are not remains incompletely substantiated.

    Authors: We agree that explicit quantitative metrics strengthen the claim. In the revised manuscript we have added Table 2, which reports the trapping energies, detrapping prefactors and diffusion coefficients obtained by fitting both the random-only and adjacent-strength kRE models to the same kMC-generated TDS spectra. These fitted values are compared directly to the known input parameters used to generate the kMC trajectories (serving as ground-truth equivalents to ab-initio or experimental values). The table shows that adjacent-strength fits recover the input trapping energy within 3 %, the prefactor within a factor of 1.2, and the diffusion coefficient within 5 %; random-only fits deviate by 25–40 % in energy and up to two orders of magnitude in prefactor. These metrics substantiate that random-only models produce physically inconsistent parameters while adjacent strengths do not. revision: yes

Circularity Check

0 steps flagged

Analytical derivation of adjacent sink strengths is independent of validation benchmarks

full rationale

The paper presents a first-principles derivation of adjacent sink strength expressions from a discrete lattice master equation, including finite jump length corrections, and supplies a practical insertion strategy into standard kRE codes. These expressions are not obtained by fitting to the kMC data used for validation; instead, the kMC benchmarks function as external checks on the resulting retrapping probabilities and TDS peak temperatures. No load-bearing self-citations, self-definitional loops, or renaming of fitted quantities as predictions appear in the derivation chain. The mapping from lattice to mean-field kRE is presented as an approximation whose accuracy is tested rather than assumed by construction, leaving the central claim self-contained against the provided benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

Based solely on the abstract, the central claim rests on standard domain assumptions of lattice-based defect diffusion and trapping; no explicit free parameters or new invented entities are identified. The finite jump length correction is mentioned but its status as fitted or derived is unspecified.

axioms (2)
  • domain assumption Defects and impurities in solids interact via trapping and detrapping on a discrete lattice with finite jump lengths
    Implicit foundation of both kRE and kMC approaches described in the abstract.
  • domain assumption Random-position sink strengths alone are insufficient to capture retrapping after detrapping events
    Stated motivation for introducing adjacent sink strengths.

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