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International Journal of Mass Spectrometry and Ion Physics最新文献

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Secondary-ion mass spectrometry of organized organic model systems 有机模型体系的二次离子质谱分析
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-06-01 DOI: 10.1016/0020-7381(83)85031-1
L. Laxhuber, H. Möhwald, M. Hashmi
{"title":"Secondary-ion mass spectrometry of organized organic model systems","authors":"L. Laxhuber,&nbsp;H. Möhwald,&nbsp;M. Hashmi","doi":"10.1016/0020-7381(83)85031-1","DOIUrl":"10.1016/0020-7381(83)85031-1","url":null,"abstract":"<div><p>Given an accurate control of chemical composition, structure and thickness, monomolecular layers of fatty acids are used as model systems to study biological processes. Assembled as multimolecular layers on solid supports, these systems are used to prove the feasibility of secondary-ion mass spectrometry (SIMS) to investigate organic surfaces.</p><p>A simple model can be applied to explain the observed sputtering phenomena. The yield of this process is, for the organic systems, approximately as large as that for inorganic systems, but the damaged cross-section is considerably larger. The latter determines the dependence of the intensities of various signals on the primary-ion dose. Yet it could be shown that the chemical composition of the organic system can be determined with a depth resolution of better than 25 Å.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85031-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84496431","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: 18
Reevaluation of the temperature dependence of the reactions of Cl+ and HCl+· with H2 Cl+和HCl+·与H2反应温度依赖性的再评价
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-06-01 DOI: 10.1016/0020-7381(83)85023-2
Paul R. Kemper, Michael T. Bowers
{"title":"Reevaluation of the temperature dependence of the reactions of Cl+ and HCl+· with H2","authors":"Paul R. Kemper,&nbsp;Michael T. Bowers","doi":"10.1016/0020-7381(83)85023-2","DOIUrl":"10.1016/0020-7381(83)85023-2","url":null,"abstract":"<div><p>The temperature dependence of the reaction of Cl<sup>+</sup> with H<sub>2</sub> has been the subject of several recent studies. The interest in this reaction derives mainly from its importance in modeling chlorine chemistry in interstellar clouds. New data on this reaction are reported that suggest the reaction has a weak negative temperature dependence in agreement with recent flow tube studies. Data for the HD and D<sub>2</sub> isotopic species show the same trend. New data on the HCl<sup>+</sup> + H<sub>2</sub> reaction are also reported.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85023-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73268325","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: 3
Collisional moderation by foreign gases in the reaction of SiH3+ with C2H4 SiH3+与C2H4反应中外来气体的碰撞缓和
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-06-01 DOI: 10.1016/0020-7381(83)85022-0
R.N. Abernathy , F.W. Lampe
{"title":"Collisional moderation by foreign gases in the reaction of SiH3+ with C2H4","authors":"R.N. Abernathy ,&nbsp;F.W. Lampe","doi":"10.1016/0020-7381(83)85022-0","DOIUrl":"10.1016/0020-7381(83)85022-0","url":null,"abstract":"<div><p>Collisional enhancement of the SiC<sub>2</sub>H<sub>7</sub><sup>+</sup> intensity in the reaction of SiH<sub>3</sub><sup>+</sup> ions of 2.6 eV laboratory kinetic energy with C<sub>2</sub>H<sub>4</sub> is due to moderation of the reactant-ion energy rather than removal of excess energy from the (SiC<sub>2</sub>H<sub>7</sub><sup>+</sup>)* collision complex. The effectiveness of (CD<sub>3</sub>)<sub>4</sub>Si, CH<sub>4</sub>, CO<sub>2</sub>, N<sub>2</sub>, D<sub>2</sub> and Ar as kinetic energy moderators was studied at a constant C<sub>2</sub>H<sub>4</sub> pressure of 2.5 × 10<sup>−4</sup> torr and at moderator pressures up to 5 × 10<sup>−3</sup> torr. The most important property determining moderator efficiency is molecular complexity, i.e. number of vibrational degrees of freedom. The moderator (CD<sub>3</sub>)<sub>4</sub>Si is not efficient, despite its large number of vibrational degrees of freedom, because it undergoes a rapid reaction with SiH<sub>3</sub><sup>+</sup> to produce (CD<sub>3</sub>)<sub>3</sub>Si<sup>+</sup> ions.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85022-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83663078","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: 6
Determination of the 241Pu half-life by isotope mass spectrometry 同位素质谱法测定241Pu的半衰期
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-06-01 DOI: 10.1016/0020-7381(83)85032-3
P. De Bièvre, M. Gallet, R. Werz
{"title":"Determination of the 241Pu half-life by isotope mass spectrometry","authors":"P. De Bièvre,&nbsp;M. Gallet,&nbsp;R. Werz","doi":"10.1016/0020-7381(83)85032-3","DOIUrl":"10.1016/0020-7381(83)85032-3","url":null,"abstract":"<div><p>The decrease in the <sup>241</sup>Pu/<sup>240</sup>Pu isotope ratio and in the ratio of the isotope ratios (<sup>241</sup>Pu/<sup>240</sup>Pu)/(<sup>240</sup>Pu/<sup>239</sup>Pu) due to the β-decay of <sup>241</sup>Pu was measured by high-precision isotope mass spectrometry over a period of six years on a 93% isotopically enriched sample. The resulting value for the <sup>241</sup>Pu half-life is 14.33 ± 0.02 years.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85032-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79479843","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
The need for accurate minor isotope abundance values in reactor neutron activation analysis 反应堆中子活化分析中需要精确的微量同位素丰度值
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-06-01 DOI: 10.1016/0020-7381(83)85026-8
P. De Bièvre, F. De Corte , L. Moens, A. Simonits , J. Hoste
{"title":"The need for accurate minor isotope abundance values in reactor neutron activation analysis","authors":"P. De Bièvre,&nbsp;F. De Corte ,&nbsp;L. Moens,&nbsp;A. Simonits ,&nbsp;J. Hoste","doi":"10.1016/0020-7381(83)85026-8","DOIUrl":"10.1016/0020-7381(83)85026-8","url":null,"abstract":"<div><p>The need for accurate isotope abundance values (θ) in reactor neutron activation analysis is discussed. A comparison of literature θ-values for target isotopes of low abundance is made and this shows a considerable scattering of data. Although the <em>k</em><sub>0</sub> standardization method can offer some help in nuclear data evaluation, it must be concluded that, for some 14 analytically interesting minor isotopes, more reliable θ-values are required: <sup>36</sup>S, <sup>50</sup>Ti, <sup>58</sup>Fe, <sup>64</sup>Ni, <sup>74</sup>Se, <sup>84</sup>Sr, <sup>112</sup>Sn, <sup>122</sup>Sn, <sup>124</sup>Sn, <sup>130</sup>Ba, <sup>162</sup>Er, <sup>174</sup>Hf, <sup>198</sup>Pt, <sup>196</sup>Hg.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85026-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85842871","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: 7
Charge transfer reactions in hydrogen bromide, hydrogen chloride and water 溴化氢、氯化氢和水中的电荷转移反应
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-06-01 DOI: 10.1016/0020-7381(83)85024-4
A. Jówko, M. Foryś, B.Ö. Jonsson
{"title":"Charge transfer reactions in hydrogen bromide, hydrogen chloride and water","authors":"A. Jówko,&nbsp;M. Foryś,&nbsp;B.Ö. Jonsson","doi":"10.1016/0020-7381(83)85024-4","DOIUrl":"10.1016/0020-7381(83)85024-4","url":null,"abstract":"<div><p>The relative cross-sections for charge transfer to hydrogen chloride, hydrogen bromide and water vapour together with the mass spectrum of HBr were obtained with several reactant ions.</p><p>The <em>Q</em>(RE) functions resembled the corresponding photoelectron spectra, confirming earlier statements that the PE peaks can be treated as experimental FC factors.</p><p>The influence of electronic and/or vibrational excitation, as well as of the kinetic energy of the reactant ions, on the hydrogen bromide mass spectrum has been demonstrated.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85024-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84784203","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: 4
The general form of the quadrupole ion trap potential 四极离子阱电位的一般形式
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-06-01 DOI: 10.1016/0020-7381(83)85033-5
Randall D. Knight
{"title":"The general form of the quadrupole ion trap potential","authors":"Randall D. Knight","doi":"10.1016/0020-7381(83)85033-5","DOIUrl":"10.1016/0020-7381(83)85033-5","url":null,"abstract":"","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85033-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88858310","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: 80
A thermal ion source for quadrupole mass spectrometers 四极质谱仪的热离子源
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-06-01 DOI: 10.1016/0020-7381(83)85027-X
H.S. Mckown, D.H. Smith, R.L. Sherman
{"title":"A thermal ion source for quadrupole mass spectrometers","authors":"H.S. Mckown,&nbsp;D.H. Smith,&nbsp;R.L. Sherman","doi":"10.1016/0020-7381(83)85027-X","DOIUrl":"10.1016/0020-7381(83)85027-X","url":null,"abstract":"<div><p>A new ion source has been designed and tested for performing thermal ionization isotopic analyses with a quadrupole mass spectrometer. Significantly improved performance in comparison to the commercial source was obtained.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85027-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88923204","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: 4
Joe L. Franklin, Jr. 小乔·富兰克林
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-06-01 DOI: 10.1016/0020-7381(83)85021-9
Burnaby Munson
{"title":"Joe L. Franklin, Jr.","authors":"Burnaby Munson","doi":"10.1016/0020-7381(83)85021-9","DOIUrl":"10.1016/0020-7381(83)85021-9","url":null,"abstract":"","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85021-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"105599442","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: 0
Cluster-ion emission from an aluminium surface under Cd+ ion bombardment 镉离子轰击下铝表面的团簇离子发射
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-05-15 DOI: 10.1016/0020-7381(83)87010-7
P. Chakraborty, S.D. Dey
{"title":"Cluster-ion emission from an aluminium surface under Cd+ ion bombardment","authors":"P. Chakraborty,&nbsp;S.D. Dey","doi":"10.1016/0020-7381(83)87010-7","DOIUrl":"10.1016/0020-7381(83)87010-7","url":null,"abstract":"","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)87010-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89447144","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: 7
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