Littérature scientifique sur le sujet « Photolyse – Atmosphère »
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Articles de revues sur le sujet "Photolyse – Atmosphère":
Röckmann, T., S. Walter, B. Bohn, R. Wegener, H. Spahn, T. Brauers, R. Tillmann, E. Schlosser, R. Koppmann et F. Rohrer. « Isotope effect in the formation of H<sub>2</sub> ; from H<sub>2</sub>CO studied at the atmospheric simulation chamber SAPHIR ». Atmospheric Chemistry and Physics 10, no 12 (16 juin 2010) : 5343–57. http://dx.doi.org/10.5194/acp-10-5343-2010.
Epstein, S. A., et S. A. Nizkorodov. « A comparison of the chemical sinks of atmospheric organics in the gas and aqueous phase ». Atmospheric Chemistry and Physics Discussions 12, no 4 (19 avril 2012) : 10015–58. http://dx.doi.org/10.5194/acpd-12-10015-2012.
Cataldo, Franco, Giovanni Strazzulla et Susana Iglesias-Groth. « UV photolysis of polyynes at λ=254 nm and at λ>222 nm ». International Journal of Astrobiology 7, no 2 (avril 2008) : 107–16. http://dx.doi.org/10.1017/s147355040800414x.
Epstein, S. A., et S. A. Nizkorodov. « A comparison of the chemical sinks of atmospheric organics in the gas and aqueous phase ». Atmospheric Chemistry and Physics 12, no 17 (12 septembre 2012) : 8205–22. http://dx.doi.org/10.5194/acp-12-8205-2012.
Gálvez, Óscar, M. Teresa Baeza-Romero, Mikel Sanz et Alfonso Saiz-Lopez. « Photolysis of frozen iodate salts as a source of active iodine in the polar environment ». Atmospheric Chemistry and Physics 16, no 19 (12 octobre 2016) : 12703–13. http://dx.doi.org/10.5194/acp-16-12703-2016.
Watanabe, Yasuto, et Kazumi Ozaki. « Relative Abundances of CO2, CO, and CH4 in Atmospheres of Earth-like Lifeless Planets ». Astrophysical Journal 961, no 1 (1 janvier 2024) : 1. http://dx.doi.org/10.3847/1538-4357/ad10a2.
Gálvez, O., M. T. Baeza-Romero, M. Sanz et A. Saiz-Lopez. « Photolysis of frozen iodate salts as a source of active iodine in the polar environment ». Atmospheric Chemistry and Physics Discussions 15, no 19 (15 octobre 2015) : 27917–42. http://dx.doi.org/10.5194/acpd-15-27917-2015.
Peacock, Sarah, Travis S. Barman, Adam C. Schneider, Michaela Leung, Edward W. Schwieterman, Evgenya L. Shkolnik et R. O. Parke Loyd. « Accurate Modeling of Lyα Profiles and Their Impact on Photolysis of Terrestrial Planet Atmospheres ». Astrophysical Journal 933, no 2 (1 juillet 2022) : 235. http://dx.doi.org/10.3847/1538-4357/ac77f2.
Osajima, Josy Anteveli, Carla Cristina Schmitt Cavalheiro et Miguel Guillermo Neumann. « Changes in Molecular Weight of Poly(Styrenesulfonate) Initiated by Thioxanthone : Photolysis and Photo-Oxidation ». Materials Science Forum 869 (août 2016) : 346–49. http://dx.doi.org/10.4028/www.scientific.net/msf.869.346.
Moortgat, Geert K. « Important photochemical processes in the atmosphere ». Pure and Applied Chemistry 73, no 3 (1 janvier 2001) : 487–90. http://dx.doi.org/10.1351/pac200173030487.
Thèses sur le sujet "Photolyse – Atmosphère":
Romanzin, Claire. « Étude des processus de photolyse du méthane dans le cadre du programme SET UP (Simulations Expérimentales et Théoriques Utiles à la Planétologie) : application à l’atmosphère de Titan ». Paris 12, 2007. http://www.theses.fr/2007PA120083.
Saturn’s biggest satellite, Titan, is the only one to exhibit a dense and chemically rich atmosphere. Its complex atmospheric chemistry is mainly initiated by the dissociation of atmospheric nitrogen and methane. In order to study the photochemical processes occuring on Titan, a photochemical reactor is being developed by the LISA laboratory. In this project, called SET UP (Experimental and Theoretical Simulations Useful for Planetology), methane is planned to be photodissociated by means of multiphotonic photolysis at 248 nm (5 eV). This photolytic process is different from the one responsible for CH4 photolysis on Titan i. E. The absorption of one photon at 121,6 nm (10,2 eV). Thus, the aim of my thesis work is to perform a comparative study of CH4 photolysis at 121,6 nm and 248 nm. The nature and abundance of the primary fragments arising from CH4 photolysis – especially the CH fragment – and of the stable molecules resulting from the subsequent chemistry have been studied both experimentally and theoretically. FTIR (Fourier Transform Infra-Red) spectroscopy and laser spectroscopy techniques such as LIF (Laser Induced Fluorescence) and CRDS (Cavity Ring Down Spectroscopy) have been employed as experimental techniques. The CRDS experiments have been performed in the LPPM laboratory as a collaboration. The different results obtained lead us to the conclusion that the fragments issued from CH4 photolysis at 121,6 and 248 nm are presumably different
Bartolomei, Vincent. « Etude de la chimie de l'acide nitreux (HONO) pour les atmosphères intérieures ». Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4707.
People in Western societies spend about 90% of their time indoors, predominantly within indoor places. The residence time of the airborne indoor pollutants is much longer due to the smaller volumes compared to the outdoor atmosphere and low air exchange rates. Therefore, a comprehensive understanding of indoor air quality is essential.Nitrous acid (HONO) is an emerging indoor pollutant because 1) it can lead to human respiratory tract irritation and formation of carcinogenic nitrosamines, and 2) it can be effectively photolyzed leading to a pulse of hydroxyl radicals (OH).The PhD work here presented is focused on understanding of the formation processes of oxidizing species such as HONO and, hence, OH radicals in the built environment
Socorro, Joanna. « Etude de la réactivité hétérogène de pesticides adsorbés sur des particules modèles atmosphériques : cinétiques et produits de dégradation ». Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4769/document.
Pesticides represent a topic which raise an important number of questions. During their application, one fraction of the pesticides is emitted in the atmosphere, an important dissemination vector. In the atmosphere, pesticides are partitioned between different phases. However, due to increased use of semi-volatile pesticides, they are mostly enriched in the atmospheric particulate phase. They are adsorbed on the surface of atmospheric particles and undergo photochemical processes which govern the fate of pesticides in the atmosphere. Currently, the atmospheric fate of pesticides is based only on gas-phase reactivity. In order to properly understand the fate of pesticides and their impact on human health and on the environment, heterogeneous reactivity of 8 pesticides (cyprodinil, deltamethrin, difenoconazole, fipronil, oxadiazon, pendimethalin, permethrin and tetraconazole) adsorbed on the surface of silica particles, is evaluated. This work deals with the determination of lifetimes of these 8 pesticides under solar light irradiation, ozone (O3) and hydroxyl radicals (OH), in presence of humidity. With a daily average sunshine, the lifetimes of the pesticides in the particle phase are between ca. 1 day and 68 days. For an average mixing ratio of 40 ppb of O3 and 10^6 cm^-3 of OH radicals, the lifetimes span between 8 and more than 35 days and 24 and more than 54 days, respectively. This study shows that the reactivity in the particle phase is slower than in the gas phase and confirm the necessity to be taken into account. Degradation products are identified and reaction mechanism is proposed bringing to light the formation of compounds more toxic than their precursors
Spittler, Markus. « Untersuchungen zur troposphärischen Oxidation von Limonen Produktanalysen, Aerosolbildung und Photolyse von Produkten / ». [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96450927X.
Hussain, Altaf. « Photolysis of 2-pentyl nitrite : quantum yield and relevance to atmospheric chemistry ». Thesis, University of Aberdeen, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312620.
Laine, Patrick L. « Laser flash photolysis studies of halogen atom reactions of atmospheric interest ». Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42817.
Gladstone, Robert Vernon. « Methods for the monitoring of peroxy radicals and measurement of NOâ†2 photolysis in the atmosphere ». Thesis, University of York, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261101.
Cui, Xiaojuan. « Research of trace gases detection methods based on mid-infrared modern photonic instruments ». Electronic Thesis or Diss., Littoral, 2011. http://www.theses.fr/2011DUNK0519.
This thesis includes two parts: Development and application of a continuous-wave quantum cascade laser (CW-QCL) based instrument for measurements and study of nitrous acid (HONO) and a broadly tunable mid-infrared laser system based on difference frequency generation (DFG) in periodically poled lithium niobate (PPLN) for trace gas ( HCl, CH2O, HONO) monitoring. The OH radical is one of the key species in photochemical cycles responsible for ozone formation, which can lead to the so-called "photochemical smog" pollution. The hydroxyl radical also drives the oxidation of hydrocarbons in the atmosphere. Gaseous nitrous acid (HONO) is a major source of the OH radical in the early morning and daytime. So HONO directly affects the oxidative capacity of the atmosphere and indirectly contributes to secondary pollutants which are products of that oxidation. High accurate and precise concentration measurement of the atmospheric HONO requires high sensitivity and stability, good temporal and spatial resolution. One part of this thesis has been firstly devoted to the design of an optical instrument based on a continuous-wave (CW) quantum cascade laser (QCL) operating at 8 μm (~1255 cm ֿ ¹) for HONO detection. The sensitivity and specificity of the instrument were evaluated and described using HONO sample generated by chemical reaction of H₂SO₄ and NaNO₂. The generated HONO concentration was quantified by means of a denuder system associated with a conventional NOX analyzer. Moreover, within the limits of the QCL frequency, only 5 absorption line intensities of HONO can be found from the reference, so we measured the relative frequencies and line intensities of the remaining absorption lines especially the one which was used to do trace gas measurement. Line strengths of 19 stronger absorption lines observed are found to be around (3-90)×10-21 cm. Direct absorption spectroscopy technique combined with a 125 m multi-pass cell was applied to develop trace gas detection of HONO. In order to improve the sensitivity, wavelength modulation technique was applied, the minimum detectable HONO concentration resulting in a noise-equivalent signal was found to be about 400 ppt in 1 second integration time and fit for field measurements. HONO losses resulted from the optical cell wall was experimentally investigated. The rate constant of HONO determined in the present work might be helpful for field measurements of HONO, especially the measurements using absorption cell. Finally,the QCL-based instrument developed in the present work has been evaluated with in-door simultaneous measurements of HONO and i i CH4. The concentration of the two species obtained in the laboratory were 116 ppb and 1.5 ppm, and the corresponding 1 σ minimum detectable concentrations (MDC) in 1-second integration time are 396 ppt and 6 ppb for HONO and CH4, respectively. The other part of this thesis is focused on highly sensitive trace gas detection employing a room-temperature, broadly tunable and narrow linewidth mid-infrared difference frequency generation laser source. The mid-infrared laser system is based on quasi-phase-matched (QPM) and DFG with a multi-grating temperature-controlled periodically poled LiNbO3 (PPLN) crystal employing two near-infrared diode lasers as pump sources. The mid-infrared coherent radiation is tunable from 3.2 μm to 3.7 μm. Detection of HCl, CH2O has been carried out. According to the absorption band (3590 cm-1) of HONO from references, another DFG laser sources employing a Ti: Sapphire laser and an Yb fiber laser as pump sources was developed, and the output frequency calibration was carried out using pure CO2 gas. HONO measurement in this wavelength range will be performed in the next work
本论文主要包括两个部分:一是基于室温连续波量子级联激光器光源,设 计并搭建了一套测量HONO 气体的系统,然后用该系统进行了HONO 气体的 探测和研究。二是利用室温操作的宽调谐差频产生中红外激光器系统进行痕量 气体(HCl, CH2O,HONO)的探测。OH 自由基是光化学循环的主要物种之一,并对臭氧的形成有重要影响,从而导致所谓的“光化学烟雾”污染。OH 自由基同时也影响着大气中烃类的氧化 能力。气态亚硝酸是清晨和白天OH 自由基的一个主要来源。因此,亚硝酸直 接影响大气的氧化能力,同时也间接推动了由于氧化过程而产生的二次污染物 的形成。大气中亚硝酸浓度的精确测量需要仪器具备高的灵敏度和稳定性,以 及好的时间和空间分辨率。本论文的主要工作之一就是设计一套以8 μm (~1255 cm-1)连续波量子级联激光器为基础对HONO 气体进行探测的装置。并利用由 H2SO4 和 NaNO2 发生化学反应而产生的HONO 气体估算和描述该装置的灵敏度和特性。产生的HONO 浓度由一个溶蚀器系统和一个NOX 分析仪来量化。在该量子级联激光器频率范围内(1254.6-1256.4 cm-1) ,只能从文献中查阅到 HONO 的5 条吸收线线强,因此测量了HONO 用于进行痕量探测的吸收线以及 其他吸收线的相对频率和线强,得到的十九条较强吸收线的线强范围大约在 (3-90)×10-21 cm。用直接吸收光谱技术结合125 m 的多次反射池对HONO 进行 了痕量探测。为了提高灵敏度,开展了波长调制技术的实验研究,得到HONO 的最低探测浓度(SNR=1) 在1 s 的积分时间内为400 ppt,适合进行外场测量。研究了由光学池壁表面而导致的HONO 的衰减效应并得到一个反应率常数,这个常数可能有助于以后HONO 的场测量,特别是用吸收池的测量。测量了实验 室空气中的HONO 和CH4,得到它们的室内浓度分别为116 ppb 和1.5 ppm, 相应的1 s 积分时间内1 σ 最小可以探测的浓度分别为396 ppt 和6 ppb。论文的另一部分工作是利用一个室温操作的,宽调谐窄线宽中红外差频产 生光源进行痕量气体的探测。该中红外差频产生系统是以准相位匹配为基础,利用两台近红外半导体激光器作为泵浦源,在PPLN 晶体中进行差频,得到的 相关中红外差频输出范围为3.2 μm 到 3.7 μm。用该系统进行了HCl 和 CH2O 气体探测,说明了该装置在工业和环境监测领域有一定的应用潜力。根据文献 得到的HONO 的另一个吸收带3590 cm-1,设计了另一套以钛宝石激光器和掺 Yb 光纤激光器作为泵浦源的差频光源系统,用CO2 气体进行了差频输出光频率 校准, 下一步的工作是进行HONO 气体测量实验。
Kameel, Fathima R. « Optical Properties and Chemical Composition of Secondary Organic Aerosol ». Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1240332384.
Mazumder, Shrila. « Laser flash photolysis studies of chlorine atom reactions with fluorinated propenes and methyl amines ». Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52308.
Chapitres de livres sur le sujet "Photolyse – Atmosphère":
Barnes, I., K. H. Becker et N. Mihalopoulos. « FTIR Product Study of the Photolysis of CH3SSCH3 : Reactions of the CH3S Radical ». Dans Dimethylsulphide : Oceans, Atmosphere and Climate, 197–210. Dordrecht : Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-017-1261-3_21.
Reuder, Joachim, Tullio Gori, Ansgar Ruggaber, Lucia Kins et Ralph Dlugi. « Photolysis Frequencies of Nitrogen Dioxide and Ozone : Measurements and Model Calculations ». Dans Biosphere-Atmosphere Exchange of Pollutants and Trace Substances, 450–56. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-03394-4_40.
Calvert, Jack G., Roger Atkinson, Karl H. Becker, Richard M. Kamens, John H. Seinfeld, Timothy J. Wallington et Greg Yarwood. « Reactions Of Non-Aromatic Products Of Aromatic Compound Oxidation ». Dans The Mechanisms Of Atmospheric Oxidation Of Aromatic Hydrocarbons, 200–229. Oxford University PressNew York, NY, 2002. http://dx.doi.org/10.1093/oso/9780195146288.003.0006.
Calvert, Jack G., John J. Orlando, William R. Stockwell et Timothy J. Wallington. « The Hydroxyl Radical and Its Role in Ozone Formation ». Dans The Mechanisms of Reactions Influencing Atmospheric Ozone. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780190233020.003.0007.
Calvert, Jack, Abdelwahid Mellouki, John Orlando, Michael Pilling et Timothy Wallington. « Rate Coefficients and Mechanisms for the Atmospheric Oxidation of the Alcohols ». Dans Mechanisms of Atmospheric Oxidation of the Oxygenates. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199767076.003.0005.
« Indirect Photolysis : Reactions with Photooxidants in Natural Waters and in the Atmosphere ». Dans Environmental Organic Chemistry, 655–86. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/0471649643.ch16.
Ramteke, Dr Shobhana, et Dr Bharat Lal Sahu. « A CRITICAL REVIEW ON THE ROLE OF HYDROGEN AS A CLEAN FUEL SOURCE ». Dans Futuristic Trends in Chemical Material Sciences & ; Nano Technology Volume 3 Book 6, 101–14. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bjcs6p2ch1.
Calvert, Jack G., Richard G. Derwent, John J. Orlando, Geoffrey S. Tyndall et Timothy J. Wallington. « Kinetics and Mechanisms of Reactions of Cl, O(3P), NO3, and O3 with Alkanes ». Dans Mechanisms of Atmospheric Oxidation of the Alkanes, 104–73. Oxford University PressNew York, NY, 2008. http://dx.doi.org/10.1093/oso/9780195365818.003.0003.
Calvert, Jack, Abdelwahid Mellouki, John Orlando, Michael Pilling et Timothy Wallington. « Rate Coefficients and Mechanisms for the Atmospheric Oxidation of the Ketones ». Dans Mechanisms of Atmospheric Oxidation of the Oxygenates. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199767076.003.0008.
Calvert, Jack, Abdelwahid Mellouki, John Orlando, Michael Pilling et Timothy Wallington. « Rate Coefficients and Mechanisms for the Atmospheric Oxidation of the N-Atom-Containing Oxygenates ». Dans Mechanisms of Atmospheric Oxidation of the Oxygenates. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199767076.003.0011.
Actes de conférences sur le sujet "Photolyse – Atmosphère":
Manners, James. « A fast and flexible scheme for photolysis and radiative heating of the whole atmosphere ». Dans RADIATION PROCESSES IN THE ATMOSPHERE AND OCEAN. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0185476.
Liu, Xu, et F. J. Murcray. « N2O Vertical Profiles Retrieved from Ground-based Solar Absorption Spectra Taken at McMurdo Station During Austral Spring of 1989 ». Dans Optical Remote Sensing of the Atmosphere. Washington, D.C. : Optica Publishing Group, 1995. http://dx.doi.org/10.1364/orsa.1995.tuc5.
Webb, Ann R., Richard Kift et Abdulaziz Seroji. « Deriving actinic flux and photolysis rates from spectral and multiband measurements of UV irradiance ». Dans Third International Asia-Pacific Environmental Remote Sensing Remote Sensing of the Atmosphere, Ocean, Environment, and Space, sous la direction de Wei Gao, Jay R. Herman, Guangyu Shi, Kazuo Shibasaki et James R. Slusser. SPIE, 2003. http://dx.doi.org/10.1117/12.466123.
Mack, J. A., J. M. Price et Alec M. Wodtke. « Stimulated Emission Pumping (SEP)1 Studies of Energy Transfer in Highly Vibratonally Excited Oxygen ». Dans High Resolution Spectroscopy. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/hrs.1993.mb5.