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

Substance: i-pentanal					Other Names: 3-methylbutanal

Formula: C5H10O; (CH3)2CHCH2CHO				CAS-No.: 590-86-3

Study: photolysis, uv absorption cross sections


Authors: L. Zhu, T. Cronin, A. Narang

Title: Wavelength-dependent photolysis of i-pentanal and t-pentanal from 280-330 nm region

Journal/Source: J. Phys. Chem. A, 103, 7248-7253, (1999); DOI: 10.1021/jp991540p


Data: diagram, table

Energy/Wavelength range: 280 - 330 nm

Resolution: 5 nm

Temperature: 298 K

Temperature dependence: no

Pressure/Concentration:

Phase:

pH:


Comments: Photodissociation of i-pentanal ((CH3)2CHCH2CHO; 3-methylbutanal) and t-pentanal ((CH3)3CCHO; 2,2-dimethylpropanal) 
in the 280-330 nm region was investigated at 5 nm intervals by using dye laser photolysis in combination with cavity ring-down spectroscopy. 
Absorption cross-sections of i-pentanal and t-pentanal were obtained. Both aldehydes exhibited a broad absorption band peaking at 295 nm, 
with maximum absorption cross-sections of (5.90 ± 0.22) × 10-20 and (4.26 ± 0.07) × 10-20 cm2, respectively, for i-pentanal and t-pentanal.
The peak HCO yields from t-pentanal and i-pentanal photolysis were 0.92 ± 0.11 and 0.40 ± 0.08 at 315 nm, respectively.

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