Ultrasensitive detection of nitric oxide at 5.33 μm by using external cavity quantum cascade laser-based Faraday rotation spectroscopy

Rafał Lewickia, James H. Doty, Robert F. Curl, Frank K. Tittela, Gerard Wysocki

Research output: Contribution to journalArticle

123 Scopus citations

Abstract

A transportable prototype Faraday rotation spectroscopic system based on a tunable external cavity quantum cascade laser has been developed for ultrasensitive detection of nitric oxide (NO). A broadly tunable laser source allows targeting the optimum Q3/2(3/2) molecular transition at 1875.81 cm-1 of the NO fundamental band. For an active optical path of 44 cm and 1-s lock-in time constant minimum NO detection limits (1σ) of 4.3 parts per billion by volume (ppbv) and 0.38 ppbv are obtained by using a thermoelectrically cooled mercury-cadmium-telluride photodetector and liquid nitrogen-cooled indium-antimonide photodetector, respectively. Laboratory performance evaluation and results of continuous, unattended monitoring of atmospheric NO concentration levels are reported.

Original languageEnglish (US)
Pages (from-to)12587-12592
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume106
Issue number31
DOIs
StatePublished - Aug 4 2009

All Science Journal Classification (ASJC) codes

  • General

Keywords

  • External cavity laser
  • Magnetic circular birefringence
  • Midinfrared
  • Nitric oxide detection
  • Paramagnetic species

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