Measurements of tropospheric HO2 and RO2 by oxygen dilution modulation and chemical ionization mass spectrometry.

The article presents a study on the method developed for the measurement of hydroperoxy radicals and and organic peroxy radicals which combines chemical ionization mass spectrometry (CIMS) peroxy radical measurement techniques. The study states that two modes of operation are established for ambient measurements, such as that hydroperoxy radicals are measured close at 100% efficieny. The study notes that peroxy radical indicates good agreement under tropospheric conditions.