25 26 Hydroxycarbonyl compounds are important secondary reaction products in the 27 oxidation of Volatile Organic Compounds (VOCs) in the atmosphere. The 28 atmospheric fate of these oxygenated VOCs is however poorly understood, 29 especially the relevance of the photolytic pathway. In this work, a combined 30 investigation of the photolysis and temperature-dependent OH radical reaction of 331 ...

We study the interplay of neutrino oscillation and invisible decay in atmospheric and long-baseline neutrinos experiments. We perform a global analysis of the full atmospheric data from Super-Kamiokande together with long-baseline K2K and MINOS in these scenarios. We find that the admixture of νμ → ντ oscillations with parameters ∆m232 = 2.6×10 −3 eV and θ23 ∼ 34 ◦ plus decay of the heavy neutr...

The hydrogen abstraction reaction of OH radical with CH3CH2OCF2CHF2 (HFE-374pc2) is investigated theoretically by semi-classical transition state theory. The stationary points on the potential energy surface of the reaction are located by using KMLYP density functional method along with 6-311++G(d,p) basis set. Vibrational anharmonicity coefficients, ...

The Michelson Interferometer for Passive Atmospheric Sounding onboard ENVISAT (MIPAS-E) offers the opportunity to detect and spectrally resolve many atmospheric minor constituents affecting atmospheric chemistry. In this paper, we describe an algorithm produced to retrieve HCFC–22 profiles from MIPAS-E measurements made in 2003 and present results from this scheme between 300 and 50 mb. By comp...

The axino with mass in the GeV region can be cold dark matter(CDM) in the galactic halo. However, if R-parity is broken, for example by the bilinear terms, then axino(ã) can decay to ν + γ. In this case, the most stringent bound on the axino lifetime comes from the diffuse photon background and we obtain that the axino lifetime should be greater than 3.9 × 10Ωãh s which amounts to a very small ...

[1] Nitrogen trifluoride (NF3) is an atmospherically persistent greenhouse gas that is primarily removed by UV photolysis and reaction with O(D) atoms. In this work, the NF3 gas-phase UV absorption spectrum, s(l,T), was measured at 16 wavelengths between 184.95 and 250 nm at temperatures between 212 and 296K. A significant spectrum temperature dependence was observed in the wavelength region mo...

The principal optical observable emission resulting from ionospheric modification (IM) experiments is the atomic oxygen red line at 630 nm, originating from the O(1D–3P) transition. Because the O(1D) atom has a long radiative lifetime, it is sensitive to collisional relaxation and an observed decay faster than the radiative rate can be attributed to collisions with atmospheric species. In contr...

It is currently uncertain as to whether methane exists on Mars. Data from the Curiosity Rover suggests a background concentration of few tenths parts per billion whereas data Trace Gas Orbiter suggest an upper limit twenty trillion. If Mars then we do not understand fully physical and chemical processes affecting its lifetime. Atmospheric models over-estimate in lifetime by factor around six hu...

Polyols and organic sulfates have recently been identified in the secondary organic aerosol (SOA) formed in the photooxidation of isoprene in both the laboratory and under ambient atmospheric conditions. Nuclear magnetic resonance methods were used to monitor the bulk reaction kinetics of acid-catalyzed hydrolysis reactions for isoprene- and 1,3-butadiene-derived epoxides in order to determine ...