science-softCon uv/vis+ photochemistry database;	www.photochemistry.org; (C) science-softCon 2019

Substance: n-pentanal					Other Names: n-valeraldehyde; valeral

Formula: C5H10O; CH3(CH2)3CHO				CAS-No.: 110-62-3

Study: photooxidation, uv absorption spectrum


Authors: J. Tadic, I. Juranic, G.K. Moortgat

Title: Pressure dependence of the photooxidation of selected carbonyl compounds in air: n-butanal and n-pentanal

Journal/Source: J. Photochem. Photobiol. A: Chem., 143, 169-179, (2001); http://dx.doi.org/10.1016/S1010-6030(01)00524-X


Data: table, diagram

Energy/Wavelength range: 230 - 350 nm

Resolution: 1 nm

Temperature: 298 K

Temperature dependence: no

Pressure/Concentration:

Phase: gas

pH:


Comments: Dilute mixtures of n-butanal and n-pentanal in synthetic air (up to 100 ppm) were photolyzed with fluorescent 
UV lamps (275-380 nm) in air at 298 K. At 100 Torr, in the photolysis of n-butanal and n-pentanal Phi(100)=0.48±0.02 and 0.40±0.04, whereas 
at 700 Torr, the total quantum yields were Phi(700)=0.38±0.02 and 0.32±0.01, respectively. The pressure dependence of the absolute 
quantum yields is investigated. UV absorption cross-sections were measured prior to photolysis.

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