Ultraviolet absorption cross sections and atmospheric photodissociation rate constants of formaldehyde

Autor:	Jerry D. Rogers
Rok vydání:	1990
Předmět:	Degree (graph theory) Chemistry Photodissociation General Engineering Analytical chemistry Formaldehyde Photochemistry Electromagnetic radiation Cross section (physics) Wavelength chemistry.chemical_compound Reaction rate constant Physical and Theoretical Chemistry Zenith
Zdroj:	The Journal of Physical Chemistry. 94:4011-4015
ISSN:	1541-5740 0022-3654
DOI:	10.1021/j100373a025
Popis:	Ultraviolet absorption cross sections of gas-phase formaldehyde were measured over the wavelength range of 235-365 nm using a Bomem Fourier transform spectrometer. The uncertainties in the measured cross sections were 1-2%, including the estimated effect of systematic errors. The sum of the cross sections in the wavelength region between 300 and 365 nm was about 6% larger than the previous best estimate of this sum. These new UV cross sections were used to calculate photodissociation rate constants for formaldehyde for the {phi}{sub 1} photolysis channel (HCHO {yields} H + HCO) and the {phi}{sub 2} photolysis channel (HCHO {yields} H{sub 2} + CO) at solar zenith angles ranging from 0{degree} to 86{degree}. The new photodissociation rate constants were about 8% larger for the {phi}{sub 1} channel and about 10% smaller for the {phi}{sub 2} channel than the currently accepted values for these rate constants.
Databáze:	OpenAIRE
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