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      "statement": "# Hentschel and colleagues: attosecond metrology\n\nMeasured a 650 ± 150 attosecond soft-X-ray pulse and its synchronization with the driving light field, demonstrating access to sub-femtosecond electronic dynamics.\n\n## Scientific scope\n\nThe record is the exact 2001 Nature article and its reported measurement. Other attosecond-pulse generation schemes, later isolated-pulse records and subsequent attosecond spectroscopy remain separate.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nM. Hentschel; R. Kienberger; Ch. Spielmann; G. A. Reider; N. Milosevic; T. Brabec; P. Corkum; U. Heinzmann; M. Drescher; F. Krausz\n\nThe named authors contributed to this scoped work; individual effort shares and later applications are not assigned by the byline.\n\n\n\n## Original sources\n\n- [Nature record for attosecond metrology](https://www.nature.com/articles/35107000)\n- [Crossref record for attosecond metrology](https://api.crossref.org/works/10.1038%2F35107000)\n",
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