Data Sources and Ranking Methodology
The 5th edition of the Research.com Best Chemistry Scientists in Iraq Ranking is primarily derived from comprehensive bibliometric data sourced from OpenAlex and CrossRef, supplemented by multiple other reputable data repositories. The citation-based metrics used to determine the ranking positions were meticulously collected on January 12, 2026. A scientist’s position is established based on their D-index (Discipline H-index), a refined bibliometric measure that exclusively considers papers and citation metrics within the examined discipline, thereby ensuring the relevance and precision of the ranking within the field of Chemistry.
Scope of Research and Qualification Criteria
The ranking assessment encompassed an analysis of 279,971 scientist profiles identified from a broad array of bibliometric databases across all scientific disciplines, including 4,000 profiles specifically in Chemistry. To qualify for inclusion in this ranking, a scientist must possess a D-index of at least 40, with a majority of their tier publications situated within the domain of Chemistry. Additionally, considerations were given to the scientist’s awards and notable achievements in the field. The D-index threshold for each discipline is adjusted in increments of 10 according to the total number of scholars estimated within that field, while rigorously ensuring that the top 1% of leading scholars are incorporated. Furthermore, the inclusion criteria require that the proximity between a researcher’s general H-index and their Discipline H-index remains at 30% or less, preserving consistency between their overall and discipline-specific impact.
Verification and Validation Practices
Recognizing that raw bibliometric data alone cannot serve as an absolute measure to evaluate scholarly output, the research team executed a thorough manual verification process. Each scientist’s profile was cross-correlated against an extensive range of trustworthy sources and verified for accuracy and relevance. While not contributing directly to the ranking position, the number of papers published in prominent journals and conference proceedings was also examined as a valuable secondary indicator of a scientist’s contribution to their specific scientific area.
The ranking positions reflect the calculated D-index derived from data acquired through OpenAlex and CrossRef, which are the foremost and widely respected bibliometric databases accessible to the global research community. We encourage readers to learn more about the detailed methodology employed by visiting our methodology page.
Research.com’s Mission and Vision
Research.com is dedicated to motivating researchers, industry leaders, and policymakers worldwide to monitor the trajectories of leading experts. Our mission is to provide the scientific community with transparent, rigorous, and accessible tools to identify leading experts in specific areas of study, across various countries, and within research institutions. By fostering such visibility and benchmarking, we aim to enhance collaboration, recognition, and informed decision-making throughout the global research ecosystem.
