The uptake of HNO3 on meteoric smoke analogues

Frankland, Victoria L.; James, Alexander D.; Feng, Wuhu; Plane, J. M. C.

doi:10.1016/j.jastp.2015.01.010

Cited by 23 publications

(26 citation statements)

References 34 publications

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“…Samples of the Allende (CV3) (Clarke, et al, 1971), Murchison (CM2) (Fuchs, et al, 1973) Fe(SO4)2(NH4)2 (Sigma-Aldrich) and Na4SiO4 (Alfa Aesar) (Frankland, et al, 2015). Solutions 207 immediately turn blue when Fe is present but otherwise are colourless.…”

Section: Meteoritic Materials 178mentioning

confidence: 99%

“…given system, however this large upper limit allows measurement of processes which are 492 relatively slow (Frankland, et al, 2015). The question of available surface area is also 493 pertinent in the environment, since fractal or dendritic particles are often represented as 494 spheres for reasons of computation efficiency (Saunders, et al, 2007).…”

Section: Surface Area and Morphology 473mentioning

confidence: 99%

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Prognostic Value of Cardiovascular Magnetic Resonance and Single-Photon Emission Computed Tomography in Suspected Coronary Heart Disease: Long-Term Follow-up of a Prospective, Diagnostic Accuracy Cohort Study

et al. 2016

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11Analogues have been developed and characterised for both interplanetary dust and 12 meteoric smoke particles. These include amorphous materials with elemental compositions 13 similar to the olivine mineral solid solution series, a variety of iron oxides, undifferentiated 14 meteorites (chondrites) and minerals which can be considered good terrestrial proxies to 15 some phases present in meteorites. The products have been subjected to a suite of 16 analytical techniques to demonstrate their suitability as analogues for the target materials. 17

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Section: Meteoritic Materials 178mentioning

confidence: 99%

Section: Surface Area and Morphology 473mentioning

confidence: 99%

Prognostic Value of Cardiovascular Magnetic Resonance and Single-Photon Emission Computed Tomography in Suspected Coronary Heart Disease: Long-Term Follow-up of a Prospective, Diagnostic Accuracy Cohort Study

et al. 2016

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“…Note that the laboratory measurement was made at 181 K, and the temperature dependence of could not be measured at lower temperatures using the flow tube system. Since uptake coefficients typically have negative temperature dependences (see discussion in Frankland et al (2015)), is probably higher in T below 300 km (Flasar et al, 2005), and so the rate of uptake should be a lower limit. The uptake of C2H2 was restricted to sub-monolayer coverage (i.e.…”

Section: Heterogeneous Chemical Kineticsmentioning

confidence: 99%

Uptake of acetylene on cosmic dust and production of benzene in Titan's atmosphere

Frankland

James

Carrillo‐Sánchez

et al. 2016

Icarus

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A low-temperature flow tube and ultra-high vacuum apparatus were used to explore the uptake and heterogeneous chemistry of acetylene (C2H2) on cosmic dust analogues over the temperature range encountered T below 600 km. The uptake coefficient, , was measured at 181 K to be (1.6 ± 0.4) × 10 -4 , (1.9 ± 0.4) × 10 -4 and (1.5 ± 0.4) × 10 -4 for the uptake of C2H2 on Mg2SiO4, MgFeSiO4 and Fe2SiO4, respectively, indicating that  is independent of Mg or Fe active sites. The uptake of C2H2 was also measured on SiO2 and SiC as analogues for meteoric smoke particles T but was found to be below the detection limit ( < 6 × 10 -8 and < 4 × 10 -7 , respectively). The rate of cyclo-trimerization of C2H2 to C6H6 was found to be 2.6 × 10 -5 exp(-741/T) s -1 , with an uncertainty ranging from ± 27 % at 115 K to ± 49 % at 181 K. A chemical ablation model was used to show that the bulk of cosmic dust particles (radius 0.02 -10  T mass loss through sputtering), thereby providing a significant surface for heterogeneous 2 chemistry. A 1D model of dust sedimentation shows that the production of C6H6 via uptake of C2H2 on cosmic dust, followed by cyclo-trimerization and desorption, is probably competitive with gas-phase production of C6H6 between 80 and 120 km.

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“…Balloon-borne mass spectrometry measurements show unexpectedly low H 2 SO 4 concentrations above 40 km (Arijs et al 1985), which can be explained if the uptake coefficient for H 2 SO 4 on MSPs is greater than 0.01 (Saunders et al 2012). Frankland et al (2015) used a laboratory measurement of the uptake coefficient of HNO 3 on MSP analogue particles to show that heterogeneous removal on MSPs in the winter polar vortex between 30 and 60 km should provide an important sink for HNO 3 . Similarly, heterogeneous uptake of the HO 2 radical on MSPs, which is sensitive to the fraction of Fe in the particles, should significantly alter the general radical chemistry of the nighttime polar vortex (James et al 2017b).…”

Section: Earthmentioning

confidence: 99%

Impacts of Cosmic Dust on Planetary Atmospheres and Surfaces

et al. 2017

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Recent advances in interplanetary dust modelling provide much improved estimates of the fluxes of cosmic dust particles into planetary (and lunar) atmospheres throughout the solar system. Combining the dust particle size and velocity distributions with new chemical ablation models enables the injection rates of individual elements to be predicted as a function of location and time. This information is essential for understanding a variety of atmospheric impacts, including: the formation of layers of metal atoms and ions; meteoric smoke particles and ice cloud nucleation; perturbations to atmospheric gas-phase chemistry; and the effects of the surface deposition of micrometeorites and cosmic spherules. There is discussion of impacts on all the planets, as well as on Pluto, Triton and Titan.

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The uptake of HNO3 on meteoric smoke analogues

Cited by 23 publications

References 34 publications

Prognostic Value of Cardiovascular Magnetic Resonance and Single-Photon Emission Computed Tomography in Suspected Coronary Heart Disease: Long-Term Follow-up of a Prospective, Diagnostic Accuracy Cohort Study

Prognostic Value of Cardiovascular Magnetic Resonance and Single-Photon Emission Computed Tomography in Suspected Coronary Heart Disease: Long-Term Follow-up of a Prospective, Diagnostic Accuracy Cohort Study

Uptake of acetylene on cosmic dust and production of benzene in Titan's atmosphere

Impacts of Cosmic Dust on Planetary Atmospheres and Surfaces

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