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

Substance: i-butyraldehyde				Other Names:

Formula: C4H8O; (CH3)2CHCHO				CAS-No.: 78-84-2

Study: photolysis, uv absorption cross sections


Authors: Y. Chen, L. Zhu, J.S. Francisco

Title: Wavelength-dependent photolysis of n-butyraldehyde and i-butyraldehyde in the 280-330 nm region

Journal/Source: J. Phys. Chem. A, 106, 7755-7763, (2002); DOI: 10.1021/jp014544e


Data: diagram, table

Energy/Wavelength range: 280 - 330 nm

Resolution: 5 nm

Temperature: 298 K

Temperature dependence: no

Pressure/Concentration:

Phase: gas

pH:


Comments: The authors have investigated the gas-phase photolysis of n-butyraldehyde (CH3(CH2)2CHO) and i-butyraldehyde 
((CH3)2CHCHO) at 5 nm intervals in the 280-330 nm region using dye laser photolysis in combination with cavity ring-down 
spectroscopy. Absorption cross sections of both aldehydes have been measured. The quantum yields of radical/molecular 
photolysis products have been determined as functions of photodissociation wavelength, aldehyde pressure, and nitrogen 
buffer-gas pressure. The HCO quantum yields from i-butyraldehyde photolysis are 0.92 ± 0.08, 1.06 ± 0.07, 1.06 ± 0.13, and 1.10 ± 0.10.

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