Superconducting-Magnet-Based Faraday Rotation Spectrometer for Real Time in Situ Measurement of OH Radicals at 10 6 Molecule/cm 3 Level in an Atmospheric Simulation Chamber

Atmospheric simulation chambers play vital roles in the validation of chemical mechanisms and act as a bridge between field measurements and modeling. Chambers operating at atmospheric levels of OH radicals (10 -10 molecule/cm ) can significantly enhance the possibility for investigating the discrep...

Full description

Saved in:

Bibliographic Details
Published in:	Analytical chemistry (Washington) 2018-03, Vol.90 (6), p.3958-3964
Main Authors:	Zhao, Weixiong, Fang, Bo, Lin, Xiaoxiao, Gai, Yanbo, Zhang, Weijun, Chen, Wenge, Chen, Zhiyou, Zhang, Haifeng, Chen, Weidong
Format:	Article
Language:	eng
Subjects:	Physics
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Atmospheric simulation chambers play vital roles in the validation of chemical mechanisms and act as a bridge between field measurements and modeling. Chambers operating at atmospheric levels of OH radicals (10 -10 molecule/cm ) can significantly enhance the possibility for investigating the discrepancies between the observation and model predications. However, few chambers can directly detect chamber OH radicals at ambient levels. In this paper, we report on the first combination of a superconducting magnet with midinfrared Faraday rotation spectroscopy (FRS) for real time in situ measurement of the OH concentration in an atmospheric simulation chamber. With the use of a multipass enhanced FRS, a detection limit of 3.2 × 10 OH/cm (2σ, 4 s) was achieved with an absorption path length of 108 m. The developed FRS system provided a unique, self-calibrated analytical instrument for in situ direct measurement of chamber OH concentration.
ISSN:	0003-2700 1520-6882