Article
Heterogeneous photochemistry of imidazole-2-carboxaldehyde: HO2 radical formation and aerosol growth Public 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
- Last Modified
- 2019-12-05
- Resource Type
- Rights Statement
- DOI
- ISSN
- 1680-7324
- Language
Relationships
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heterogeneousPhotochemistryOfImidazole2CarboxaldehydeHo2R.pdf | 2019-12-05 | Public | Download |