WoS_Bibliometric_Data.txt

Single-molecule ultrafast spectroscopy has moved from proof-of-concept to a broad analytical platform. We map 2000–2025 developments by coupling bibliometrics (co-authorship, bibliographic coupling, co-citation, keyword co-occurrence, burst detection) with a technique-level appraisal. Web of Science records analyzed with VOSviewer and CiteSpace indicate geographic consolidation in the United States, Germany, and China; a shift toward plasmon-enhanced and hybrid-nanostructure approaches; and expanding applications in complex biological and energy-relevant systems. Transient-absorption pump–probe, ultrafast SERS/TERS, time-resolved STM/PEEM, and high-rate single-molecule fluorescence constitute the methodological core, but reproducibility, shot-to-shot noise control, and reporting standards remain uneven. Advances since 2023 include ML-assisted signal deconvolution, adoption of absolute quantification (detector efficiency, IRF, enhancement factors), and nanoscale instrumentation achieving atomic-scale spatial and femtosecond temporal access. Ultrafast single-molecule fluorescence in live cells now operates at tens-of-microseconds frame times, enabling tracking of dynamics previously inaccessible. We provide (i) a practical checklist for instrumentation, calibration, and data/metadata sharing and (ii) technique benchmarks to guide standardized, higher-throughput studies across chemistry, biology, and materials. These steps address sensitivity and reproducibility bottlenecks and establish a roadmap toward robust, comparable single-molecule ultrafast spectroscopies.