Ultrasensitive detection of nitric oxide at 5.33 km by using external cavity quantum cascade laser- based Faraday rotation spectroscopy
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 Q sub(3/2)(3/2) molecular transition at 1875.81 c...
Saved in:
| Published in: | Proceedings of the National Academy of Sciences - PNAS Vol. 106; no. 31; pp. 12587 - 12592 |
|---|---|
| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
01-01-2009
|
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 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 Q sub(3/2)(3/2) molecular transition at 1875.81 cm super(-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 (1Ie) 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. |
|---|---|
| Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-2 |
| ISSN: | 0027-8424 1091-6490 |
| DOI: | 10.1073/pnas.0906291106 |