Article

 

Heterogeneous photochemistry of imidazole-2-carboxaldehyde: HO2 radical formation and aerosol growth 公开 Deposited

https://scholar.colorado.edu/concern/articles/1831ck615
Abstract
  • The multiphase chemistry of glyoxal is a source of secondary organic aerosol (SOA), including its light-absorbing product imidazole-2-carboxaldehyde (IC). IC is a photosensitizer that can contribute to additional aerosol ageing and growth when its excited triplet state oxidizes hydrocarbons (reactive uptake) via H-transfer chemistry. We have conducted a series of photochemical coated-wall flow tube (CWFT) experiments using films of IC and citric acid (CA), an organic proxy and H donor in the condensed phase. The formation rate of gas-phase HO2 radicals (PHO2) was measured indirectly by converting gas-phase NO into NO2. We report on experiments that relied on measurements of NO2 formation, NO loss and HONO formation. PHO2 was found to be a linear function of (1) the [IC]×[CA] concentration product and (2) the photon actinic flux. Additionally, (3) a more complex function of relative humidity (25%
Creator
Date Issued
  • 2016-09-01
Academic Affiliation
Journal Title
Journal Issue/Number
  • 18
Journal Volume
  • 16
最新修改
  • 2019-12-05
Resource Type
权利声明
DOI
ISSN
  • 1680-7324
Language

关联

单件