The necessity for multiphoton processes in the 193-nm photochemistry of sulphuric acid aerosols

The observation, that absorption of light by concentrated sulphuric acid at wavelengths near 193 nm apparently tends to zero as the acid is progressively purified, is supported by ab initio calculations of the energies of the three lowest excited states of monomeric H 2SO 4. The electronic-structure...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 1999-12, Vol.129 (3), p.101-104
Main Authors: Wrenn, S.J, Butler, L.J, Rowland, G.A, Knox, C.J.H, Phillips, L.F
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Molecular properties and interactions with photons
Multiphoton effects in aerosols
Other multiphoton processes
Photon interactions with molecules
Physics
Sulphuric acid absorption spectrum
Sulphuric acid aerosols
Sulphuric acid excited states
Sulphuric acid photochemistry
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Summary:The observation, that absorption of light by concentrated sulphuric acid at wavelengths near 193 nm apparently tends to zero as the acid is progressively purified, is supported by ab initio calculations of the energies of the three lowest excited states of monomeric H 2SO 4. The electronic-structure calculations indicate that the lowest excited state is not accessible by single-photon absorption for light of wavelengths >150 nm. This limit includes a generous allowance for error; the calculated energy of the transition corresponds to a wavelength
ISSN:1010-6030
1873-2666
DOI:10.1016/S1010-6030(99)00170-7