Journal of research of the National Bureau of Standards. Section A, Physics and chemistry最新文献_第4页

Analysis of the Spectrum of Neutral Atomic Bromine (Br I). 中性原子溴 (Br I) 的光谱分析。

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-11-01 Epub Date: 1963-12-01 DOI: 10.6028/jres.067A.051

Jack L Tech

{"title":"Analysis of the Spectrum of Neutral Atomic Bromine (Br I).","authors":"Jack L Tech","doi":"10.6028/jres.067A.051","DOIUrl":"10.6028/jres.067A.051","url":null,"abstract":"The spectrum of the neutral bromine atom, Br I, has been newly investigated by using electrodeless discharge tubes as light sources. The observations have led to a list of wavelengths and estimated intensities for 1253 spectral lines in the range 1067 to 24100 Å. The number of known energy levels has been increased to 123 even and 128 odd levels, as compared with the 27 even and 33 odd levels previously known. All predicted energy levels of the 4s 24p 4 ns, up, nd, nf electron configurations from 0 to ~93250 K have been discovered. The observations in the vacuum ultraviolet establish that the positions of all the levels lying above those of the ground configuration as given in the compilation Atomic Energy Levels, Vol. II (1952) should be increased by 6.7 K. All but 26 faint lines of Br I have been classified. A total of 67 levels has been ascribed to the 4s 2 4p* nf configurations. It is demonstrated that the nf configurations exhibit almost pure pair coupling. The very regular (3P2)nf[5]°11/2 series yields for the principal ionization energy of Br I the value 95284.8 K.","PeriodicalId":94340,"journal":{"name":"Journal of research of the National Bureau of Standards. Section A, Physics and chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1963-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5322769/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74476016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reversibility of Polyester Adsorption on Glass. 玻璃上聚酯吸附的可逆性

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-11-01 Epub Date: 1963-12-01 DOI: 10.6028/jres.067A.059

Roben R Stromberg, Warren H Grant

{"title":"Reversibility of Polyester Adsorption on Glass.","authors":"Roben R Stromberg, Warren H Grant","doi":"10.6028/jres.067A.059","DOIUrl":"10.6028/jres.067A.059","url":null,"abstract":"The adsorption of poly(ethylene o-phthalate) from chloroform solution on glass powder and aluminum oxide was studied. The adsorption of a number of fractions, varying in number average molecular weight from 970 to 6250 showed a decrease in the moles of polymer adsorbed with increase in molecular weight. The results are interpreted to indicate that this polymer molecule lies in a relatively flattened conformation on the glass surface. More polymer was adsorbed on glass powder at 50 °C than at 0 °C. Adsorption on glass powder that had been outgassed to remove adsorbed water was less than on untreated glass. Initial adsorption at one temperature followed by exposure at the other temperature resulted in complete reversibility of sorption on the untreated glass. Decreasing the temperature from 50 to 0 °C resulted in desorption from the outgassed glass, but increasing the temperature did not result in additional adsorption. These differences are ascribed in part to adsorption across an adsorbed water layer on the untreated glass. An explanation for the \"one-direction reversibility\" observed for the outgassed glass is presented.","PeriodicalId":94340,"journal":{"name":"Journal of research of the National Bureau of Standards. Section A, Physics and chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1963-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5322777/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83000013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal Behavior of Muscovite Sheet Mica. 片状云母的热行为

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-11-01 Epub Date: 1963-12-01 DOI: 10.6028/jres.067A.057

Stanley Ruthberg

引用次数: 0

Chemical Purity by Dielectric Cryometry. 通过介电测温法测定化学纯度

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-11-01 Epub Date: 1963-12-01 DOI: 10.6028/jres.067A.060

Gaylon S Ross, Lois J Frolen

引用次数: 0

High-Temperature Thermodynamic Functions for Zirconium and Unsaturated Zirconium Hydrides 锆和不饱和氢化物锆的高温热力学函数

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-09-01 DOI: 10.6028/jres.067A.043

T. Douglas

引用次数: 16

Precise Coulometric Titrations of Potassium Dichromate. 重铬酸钾的精确库仑滴定。

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-09-01 Epub Date: 1963-10-01 DOI: 10.6028/jres.067A.047

George Marinenko, John K Taylor

引用次数: 0

Reactions of Polyfluorobenzenes With Nucleophilic Reagents. 多氟苯与亲核试剂的反应。

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-09-01 Epub Date: 1963-10-01 DOI: 10.6028/jres.067A.050

Leo A Wall, Walter J Pummer, James E Fearn, Joseph M Antonucci

{"title":"Reactions of Polyfluorobenzenes With Nucleophilic Reagents.","authors":"Leo A Wall, Walter J Pummer, James E Fearn, Joseph M Antonucci","doi":"10.6028/jres.067A.050","DOIUrl":"10.6028/jres.067A.050","url":null,"abstract":"Nucleophilic reactions of hexafluorobenzene and related polyfluorobenzenes were studied in detail. Reaction of hexafluorobenzene with hydroxides, alcoholates, aqueous amines, and organolithium compounds led to the substitution of one or more fluorine atoms. The structures of the products were determined, using near infrared and nuclear magnetic resonance spectra. Fluorine is replaced more readily than chlorine, bromine, iodine, or other groups. In the majority of the products in which two of the fluorines in hexafluorobenzene were replaced, the substituting groups were para to each other. However, depending on the reagents other orientation effects were noted. The reaction mechanisms were a function of reagents and conditions. The most prevalent mechanism is presumably the displacement of a fluoride anion by another anion, probably via the formation of transition complexes of different lifetimes. However, simple ionization or attack by neutral species may occur under some conditions. The diazotization and oxidation of pentafluoroaniline were also investigated.","PeriodicalId":94340,"journal":{"name":"Journal of research of the National Bureau of Standards. Section A, Physics and chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1963-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5319811/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73788213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heat of Oxidation of Aqueous Sulfur Dioxide With Gaseous Chlorine. 二氧化硫水溶液与气态氯的氧化热。

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-09-01 Epub Date: 1963-10-01 DOI: 10.6028/jres.067A.044

Walter H Johnson, John R Ambrose

{"title":"Heat of Oxidation of Aqueous Sulfur Dioxide With Gaseous Chlorine.","authors":"Walter H Johnson, John R Ambrose","doi":"10.6028/jres.067A.044","DOIUrl":"10.6028/jres.067A.044","url":null,"abstract":"The heat of oxidation of aqueous sulfur dioxide with gaseous chlorine has been determined by calorimetric methods. The results correspond to the reaction: <dispformula> <math> <mtable> <mtr> <mtd><msub><mtext>Cl</mtext> <mn>2</mn></msub> <mrow><mo>(</mo> <mi>g</mi> <mo>)</mo></mrow> <mo>+</mo> <msub><mtext>SO</mtext> <mn>2</mn></msub> <mo>⋅</mo> <mn>2500</mn> <mspace></mspace> <msub><mi>H</mi> <mn>2</mn></msub> <mi>O</mi> <mo>+</mo> <mn>2502</mn> <mspace></mspace> <msub><mi>H</mi> <mn>2</mn></msub> <mi>O</mi> <mo>=</mo> <msub><mi>H</mi> <mn>2</mn></msub> <msub><mtext>SO</mtext> <mn>4</mn></msub> <mo>⋅</mo> <mn>2500</mn> <mspace></mspace> <msub><mi>H</mi> <mn>2</mn></msub> <mi>O</mi> <mo>+</mo> <mn>2</mn> <mrow><mo>(</mo> <mrow><mtext>HCl</mtext> <mo>⋅</mo> <mn>1250</mn> <mspace></mspace> <msub><mi>H</mi> <mn>2</mn></msub> <mi>O</mi></mrow> <mo>)</mo></mrow> <mo>,</mo></mtd> </mtr> <mtr><mtd><mi>Δ</mi> <mi>H</mi> <mrow><mo>(</mo> <mrow><mn>25</mn> <mo>°</mo> <mi>C</mi></mrow> <mo>)</mo></mrow> <mo>=</mo> <mo>-</mo> <mn>77.28</mn> <mo>±</mo> <mn>0.14</mn> <mspace></mspace> <mtext>kcal</mtext> <mo>/</mo> <mtext>mole</mtext> <mo>.</mo></mtd> </mtr> </mtable> </math> </dispformula> The heat of formation of aqueous sulfuric acid (in 2500 moles of water) has been calculated to be -213.92 kcal/mole.","PeriodicalId":94340,"journal":{"name":"Journal of research of the National Bureau of Standards. Section A, Physics and chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1963-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5319805/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77697111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis, Purification, and Physical Properties of Seven Twelve-Carbon Hydrocarbons 七种十二碳碳氢化合物的合成、纯化和物理性质

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-09-01 DOI: 10.6028/jres.067A.049

T. Mears, C. L. Stanley, E. L. Compere, F. Howard

引用次数: 5

Thickness of Adsorbed Polystyrene Layers by Ellipsometry. 通过椭偏仪测量吸附的聚苯乙烯层厚度。

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-09-01 Epub Date: 1963-10-01 DOI: 10.6028/jres.067A.045

Robert R Stromberg, Elio Passaglia, Daniel J Tutas

{"title":"Thickness of Adsorbed Polystyrene Layers by Ellipsometry.","authors":"Robert R Stromberg, Elio Passaglia, Daniel J Tutas","doi":"10.6028/jres.067A.045","DOIUrl":"10.6028/jres.067A.045","url":null,"abstract":"The adsorption of polystyrene from cyclohexane below the theta temperature onto chrome ferrotype plate was studied by means of ellipsometry (polarization spectrometry). In this technique changes in the state of polarization of polarized light are measured upon reflection from a film-covered surface. The measurements were carried out in situ and permitted determination of the thickness and refractive index of the swollen polymer film at the solidsolution interface. A concentration range of 0.18 to 9.7 mg/ml was studied for polymer with a molecular weight of 76,000. The thickness of the adsorbed film increased with increasing solution concentration, reaching a plateau for most of the concentration range studied. The average thickness at this plateau was approximately 210 Å. The adsorbed film was highly swollen, consisting of about 12 g/100 ml of polymer for most of the concentration range. The amount adsorbed was determined to be approximately 2.25×10-4 mg/cm2 at the plateau. Comparison of the radius of gyration of polystyrene in solvent is made to the results obtained.","PeriodicalId":94340,"journal":{"name":"Journal of research of the National Bureau of Standards. Section A, Physics and chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1963-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5319806/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81353780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0