Phase-shift cavity ring-down spectroscopy to determine absolute line intensities

J.H. Helden, van, D.C. Schram, R.A.H. Engeln

Research output: Contribution to journalArticleAcademicpeer-review

24 Citations (Scopus)


Cavity ring-down detection techniques can sensitively determine frequency-dependent absorption cross-sections of gasses. However, so-called line-width problems and amplified spontaneous emission of the laser light source lowers the technique’s quantitative accuracy. Using phase-shift cavity ring-down spectroscopy (PSCRD), we measured absolute line intensities of the spin-forbidden transitions in the band of molecular oxygen. Our results were within 4% of values obtained from the HITRAN database, demonstrating the accuracy of PSCRD, when corrected for amplified spontaneous emission. Its high sensitivity (2 × 10-8 cm-1), simplicity and high duty cycle make PSCRD a powerful diagnostic technique.
Original languageEnglish
Pages (from-to)320-325
JournalChemical Physics Letters
Issue number4-6
Publication statusPublished - 2004


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