The MPI-Mainz UV/VIS Spectral Atlas

of Gaseous Molecules of Atmospheric Interest

www.uv-vis-spectral-atlas-mainz.org

Hannelore Keller-Rudek1, Geert K. Moortgat2, Rolf Sander2, Rüdiger Sörensen1

1Satellite Group

2Atmospheric Chemistry Division

Max-Planck Institute for Chemistry
Mainz, Germany

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When referring to the Spectral Atlas, please cite our publication:

Keller-Rudek, H., Moortgat, G. K., Sander, R., and Sörensen, R.: The MPI-Mainz UV/VIS spectral atlas of gaseous molecules of atmospheric interest, Earth Syst. Sci. Data, 5, 365–373, (2013), DOI: 10.5194/essd-5-365-2013

Cross Sections / Aromatic compounds / Aromatic radicals / p-CH3C6H4CH2 / Lee(2008)_300K_245-275nm

DATAFILE: p-CH3C6H4CH2_Lee(2008)_300K_245-275nm.txt
NAME: p-methylbenzyl radical
FORMULA: p-CH3C6H4CH2
AUTHOR(YEAR): Lee(2008)
T: 300K
λ: 245-275nm
BIBLIOGRAPHY: C. Lee, "Pressure and temperature dependence of recombination reactions of benzyl-type radicals", PhD Thesis Univ. Göttingen, Germany, 2008
COMMENTS: A transient absorption was measured at 260 nm and 300 K for the p-methylbenzyl radical generated by laser photolysis of Cl2 at 308 nm and the subsequent fast hydrogene abstraction of p-CH3C6H4CH3 (p-xylene) by the Cl atom

Benzyl radicals have been employed as a calibration source at the probe wavelength of 260 nm leading to σ(260 nm) = 5.0 × 10-17 cm2 molecule-1 for the p-methylbenzyl radical

Absorption measurements at different detection wavelengths between 245 and 275 nm and scaling to the 260 nm value lead to the listed absoption cross sections which habe been digitized from Fig. 3.2.6

A weak temperature dependence for T = 300-515 K was observed which could be expressed as

σ(T, 260 nm) = (5.0 ± 0.98) × 10-17 (T/300 K)-0.234 cm2 molecule-1

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