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Experimental Study of the Removal of Ground and Excited State Phosphorus Atoms by Atmospherically Relevant Species.

08:00 EDT 11th October 2019 | BioPortfolio

Summary of "Experimental Study of the Removal of Ground and Excited State Phosphorus Atoms by Atmospherically Relevant Species."

The reaction kinetics of the ground and first two excited states of atomic phosphorus, P, with atmospherically relevant species, were studied at temperatures ranging from ~ 200 - 750 K, using a pulsed laser photolysis-laser induced fluorescence technique. The temperature dependence of the rate coefficients are parameterized as (units: cm3 molecule-1 s-1, 1  errors): k(P(2P) + O2) (189 ≤ T/K ≤ 701) = (7.10 ± 1.03) × 10-12 × (T/298)^1.42 ± 0.13 × exp((374 ± 41) / T) k(P(2D) + O2) (188 ≤ T/K ≤ 714) = (1.20 ± 0.29) × 10-11 × (T/298)^0.821 ± 0.207 × exp((177 ± 70) / T) k(P(2D) + CO2) (296 ≤ T/K ≤ 748) = (5.68 ± 0.36) × 10-13 × (T/298)^0.800 ± 0.103 k(P(2D) + N2) (188 ≤ T/K ≤ 748) = (1.42 ± 0.03) × 10-12 × (T/298)^1.36 ± 0.04 k(P(4S) + O2) (187 ≤ T/K ≤ 732) = (3.08 ± 0.31) × 10-13 × (T/298)^2.24 ± 0.29 Electronic structure theory combined with RRKM calculations have been used to explain the unusual temperature dependence of P(4S) + O2. The small pre-exponential factor for the reaction results from a tight steric constraint, together with the requirement that the reaction occurs on doublet rather than sextet electronic surfaces.

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Name: The journal of physical chemistry. A
ISSN: 1520-5215
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Medical and Biotech [MESH] Definitions

Emission of LIGHT when ELECTRONS return to the electronic ground state from an excited state and lose the energy as PHOTONS. It is sometimes called cool light in contrast to INCANDESCENCE. LUMINESCENT MEASUREMENTS take advantage of this type of light emitted from LUMINESCENT AGENTS.

Stable phosphorus atoms that have the same atomic number as the element phosphorus, but differ in atomic weight. P-31 is a stable phosphorus isotope.

Unstable isotopes of phosphorus that decay or disintegrate emitting radiation. P atoms with atomic weights 28-34 except 31 are radioactive phosphorus isotopes.

Compounds containing carbon-phosphorus bonds in which the phosphorus component is also bonded to one or more sulfur atoms. Many of these compounds function as CHOLINERGIC AGENTS and as INSECTICIDES.

Carbon-containing phosphoric acid derivatives. Included under this heading are compounds that have CARBON atoms bound to one or more OXYGEN atoms of the P(=O)(O)3 structure. Note that several specific classes of endogenous phosphorus-containing compounds such as NUCLEOTIDES; PHOSPHOLIPIDS; and PHOSPHOPROTEINS are listed elsewhere.

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