The citation-based metrics utilized to devise the ranking were collected on January 12, 2026. A scientist’s position within the ranking is determined by their D-index (Discipline H-index), a metric that isolates publications and citations strictly within the examined discipline—in this case, Chemistry. This ensures that the ranking reflects a researcher’s impact and productivity specifically in their scientific domain, rather than aggregated across broader or unrelated fields.
Scope of Research and Eligibility Criteria
The ranking was built upon an analysis of 279,971 scientist profiles drawn from a variety of bibliometric databases covering all disciplines. From this extensive dataset, 8 scientists specializing in Chemistry within Tunisia were examined in detail.
To qualify for inclusion in this ranking, a scientist’s D-index had to be at least 40. Additionally, a majority of their tier publications were required to be centered in the field of Chemistry, ensuring relevant disciplinary focus. Furthermore, scientists’ awards and achievements within Chemistry were taken into account as supplementary factors to further validate their expertise and contributions to the field.
The D-index threshold is dynamically adjusted based on the estimated total number of scholars in each discipline, set in increments of 10 to maintain consistency and relevance. This approach guarantees that the ranking captures the top 1% of leading scholars for each discipline. Another important criterion is that the proximity between a researcher’s general H-index and their Chemistry-specific D-index should not exceed 30%—this ensures that the D-index reliably represents the scientist’s focused disciplinary impact.
Verification and Validation Practices
We recognize that raw bibliometric data, while foundational, can never serve as an absolute measure of a researcher’s scholarly output or impact. Accordingly, all scientist profiles included in the ranking underwent meticulous manual verification. This process involved cross-correlating publication records against a wide range of trustworthy and authoritative sources to confirm accuracy and completeness.
While the number of papers published in prominent journals and conference proceedings is not a determining factor for a researcher’s ranking position, it remains a valuable secondary indicator of a scientist’s active contribution to their area of study. The primary determinant continues to be the D-index, which quantifies citation impact strictly within Chemistry as sourced from OpenAlex and CrossRef.
We encourage those interested in a more detailed understanding of the methodology to visit our methodology page, where the comprehensive procedural framework and data handling practices are transparently described.
Research.com’s Mission and Vision
Research.com is committed to advancing the global scientific enterprise by providing transparent, credible, and thoughtfully curated rankings of leading experts in various disciplines. Our mission is to motivate researchers, companies, policymakers, and academic institutions worldwide to recognize emerging trends and forefront leaders in science. By highlighting who the leading authorities are in specific research areas, countries, or institutions, we aim to facilitate collaboration, inform strategic decision-making, and foster an inclusive and well-informed scientific community.
