Ultraviolet absorption cross sections and atmospheric photodissociation rate constants of formaldehyde

Journal Article · Thu May 17 00:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100373a025· OSTI ID:6374137

Rogers, J D ^[1]

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1. General Motors Research Labs., Warren, MI (USA)

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.

• OSTI ID: 6374137
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 94:10; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ATMOSPHERIC CHEMISTRY
FORMALDEHYDE
CROSS SECTIONS
DATA ANALYSIS
EXPERIMENTAL DATA
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
ULTRAVIOLET RADIATION
ALDEHYDES
CHEMISTRY
DATA
ELECTROMAGNETIC RADIATION
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
RADIATIONS
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
400500 - Photochemistry