Peer-Reviewed Journal Details
Mandatory Fields
Chen, J;Wenger, JC;Venables, DS
2011
November
The Journal of Physical Chemistry A
Near-Ultraviolet Absorption Cross Sections of Nitrophenols and Their Potential Influence on Tropospheric Oxidation Capacity
Validated
WOS: 40 ()
Optional Fields
NITROUS-ACID AEROSOL EXTINCTION LIGHT-ABSORPTION NITRATED PHENOLS NO3 RADICALS CE-DOAS FT-IR SPECTROSCOPY OH 2-NITROPHENOL
115
12235
12242
Nitrophenols and methylnitrophenols have been identified as photolytic precursors of nitrous acid, HONO, but their gas-phase absorption has not previously been reported. In this study, the absorption cross sections of 2-nitrophenol, 3-methyl-2-nitrophenol, and 4-methyl-2-nitrophenol were measured from 320 to 450 nm using incoherent broad-band cavity-enhanced absorption spectroscopy (IBBCEAS). The benzaldehyde absorption spectrum was measured to validate the approach and was in good agreement with literature spectra. The nitrophenol absorption cross sections are large (ca. 10(-17) cm(2) molecule(-1)) and blue-shifted about 20 nm compared to previously measured solution spectra. Besides forming HONO, nitrophenol absorption influences other photochemistry by reducing the available actinic flux. The magnitudes of both effects are evaluated as a function of solar zenith angle, and nitrophenol absorption is shown to lower the photolysis rates of O(3) and NO(2).
WASHINGTON
1089-5639
10.1021/jp206929r
Grant Details