Journal of Photochemistry最新文献_第4页

Study of the photoreduction of uranyl ions by triphenylphosphine, triphenylarsine, tri-p-tolylphosphine and tri-p-tolylarsine in acetone 三苯基膦、三苯基larsin、三对甲基膦和三对甲基larsin在丙酮中光还原铀酰离子的研究

Journal of Photochemistry Pub Date : 1987-08-01 DOI: 10.1016/0047-2670(87)80034-5

S.S. Sandhu, M.S. Sidhu, R.J. Singh

引用次数: 12

Measurements of the UV absorption cross-sections for HO2 and CH3O2 in the gas phase 气相中HO2和CH3O2的紫外吸收截面测量

Journal of Photochemistry Pub Date : 1987-08-01 DOI: 10.1016/0047-2670(87)80032-1

Michael J. Kurylo, Timothy J. Wallington, Philip A. Ouellette

{"title":"Measurements of the UV absorption cross-sections for HO2 and CH3O2 in the gas phase","authors":"Michael J. Kurylo, Timothy J. Wallington, Philip A. Ouellette","doi":"10.1016/0047-2670(87)80032-1","DOIUrl":"10.1016/0047-2670(87)80032-1","url":null,"abstract":"<div>Relative values of the gas phase absorption cross-sections σ for hydroperoxy (HO2) and methylperoxy (CH3 O2) radicals were determined at 298 K over the wavelength λ ranges 210 – 250 nm and 210 – 280 nm respectively. These determinations were based on measurements of the initial optical density (OD)0 of each radical vs. wavelength immediately following its flash photolytic generation. Chlorine atoms produced by the photolysis (λ ⩾ 300 nm) of Cl2 were stoichiometrically converted into the desired peroxy radical via the reaction sequences <figure><img></figure> or <figure><img></figure> Cross-section ratios for the two radicals, determined in separate experiments at several wavelengths, agreed well with those calculated using data from the complete (OD)0 vs. λ sets and were used to establish the relative intensities of the absorption spectral curves for the two radicals. These spectral data were converted to absolute cross-sections using measurements of the fractional photodissociation of Cl2 per flash in conjunction with measurements of the initial methylperoxy radical OD as a function of Cl2 concentration. The results are compared with existing data in the literature for both relative and absolute absorption cross-sections and the effect of these new values on the existing kinetics data base for both radicals in discussed.</div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"39 2","pages":"Pages 201-215"},"PeriodicalIF":0.0,"publicationDate":"1987-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)80032-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73512860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Aging of micellar solutions of ethylene oxide surfactants 环氧乙烷表面活性剂胶束溶液的老化

Journal of Photochemistry Pub Date : 1987-08-01 DOI: 10.1016/0047-2670(87)80044-8

Hermann Rau

引用次数: 15

Primary processes in the 121.6 nm photolysis of gas phase ethyl bromide 气相溴乙基121.6 nm光解的主要工艺

Journal of Photochemistry Pub Date : 1987-08-01 DOI: 10.1016/0047-2670(87)80033-3

Kyung-Hoon Jung, Dae Kon Oh, Kosuke Shobatake

引用次数: 0

Adiabatic photochemical isomerization of cis-1-(9-anthryl)-2-phenylethylenes 顺式-1-(9-蒽基)-2-苯乙烯的绝热光化学异构化

Journal of Photochemistry Pub Date : 1987-08-01 DOI: 10.1016/0047-2670(87)80040-0

Kjell Sandros, Hans-Dieter Becker

引用次数: 45

The photophysics and photochemistry of 2-styryl-anthracene and related compounds: extreme variations in triplet—triplet absorption spectra with the temperature, decay anomalies and transcis photoisomerization 2-苯乙烯-蒽及其相关化合物的光物理和光化学:三重-三重态吸收光谱随温度、衰变异常和经光异构化的极端变化

Journal of Photochemistry Pub Date : 1987-08-01 DOI: 10.1016/0047-2670(87)80039-4

Valeri Krongauz, Nelly Castel, Ernst Fischer

{"title":"The photophysics and photochemistry of 2-styryl-anthracene and related compounds: extreme variations in triplet—triplet absorption spectra with the temperature, decay anomalies and transcis photoisomerization","authors":"Valeri Krongauz, Nelly Castel, Ernst Fischer","doi":"10.1016/0047-2670(87)80039-4","DOIUrl":"10.1016/0047-2670(87)80039-4","url":null,"abstract":"<div>Transient triplet—triplet absorption spectra and decay curves of 2-styrylanthracene and four related compounds were determined with conventional microsecond flash spectroscopy over a wide range of temperatures between room temperature and −170 °C, in decalin and methyltetrahydrofuran as solvents. The main anomalies observed were as follows: pronounced variation in the triplet absorption spectra with the temperature and, to some extent, with the wavelength of the exciting light; “growing-in”; initial fast decay stages; non-monoexponential decay; variation in the decay rate with the wavelength of measurement. All these were observed at certain temperatures and wavelengths for each compound. Some of these anomalies may be due to the fact that 2-styrylanthracene and its derivatives exist in solution as an equilibrium mixture of two modifications, possibly rotational conformers, both in the ground and in the excited state. Some trans—cis photoisomerization, both direct and sensitized, takes place in all compounds, except possibly in 2-styrylanthracene, and is more pronounced in bromobenzene solutions.</div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"39 2","pages":"Pages 285-300"},"PeriodicalIF":0.0,"publicationDate":"1987-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)80039-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82068131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

Photolysis of methyl 2-chloro-3-oxobutanoate 2-氯-3-氧丁酸甲酯的光解反应

Journal of Photochemistry Pub Date : 1987-08-01 DOI: 10.1016/0047-2670(87)80042-4

V. Enev, I. Petkov, L. Markova, P. Markov

引用次数: 3

La photochimie des alcènes sous haute pression V: l'irradiation des cyclopentène et cyclohexène au voisinage de leur seuil d'absorption et en présence d'oxygène 高压V下烯烃的光化学:环戊烯和环己烯在氧气存在下照射到其吸收阈值附近

Journal of Photochemistry Pub Date : 1987-07-01 DOI: 10.1016/0047-2670(87)80001-1

Guy J. Collin, Hélène Deslauriers, Wlodzimierz Makulski

引用次数: 6

Benzylidene fluorene ozonolysis under chemiluminescence mimetic conditions in homegeneous and micellar media I: Kinetic law as a function of hammett's σ constants and quenching by the leaving moiety 均相和胶束介质中模拟化学发光条件下苄基芴臭氧分解I: hammett σ常数函数的动力学规律和残留部分猝灭

Journal of Photochemistry Pub Date : 1987-07-01 DOI: 10.1016/0047-2670(87)80007-2

L. Papalambros, J. Nikokavouras

引用次数: 1

Laser-induced photoionization and single-strand break formation for polynucleotides and single-stranded DNA in aqueous solution: model studies for the direct effect of high energy radiation on DNA 水溶液中多核苷酸和单链DNA的激光诱导光电离和单链断裂形成:高能辐射对DNA直接影响的模型研究

Journal of Photochemistry Pub Date : 1987-07-01 DOI: 10.1016/0047-2670(87)80013-8

J. Opitz, D. Schulte‐Frohlinde

引用次数: 48