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252Cf-PDMS of chlorophyll photoreaction center models 叶绿素光反应中心模型的252Cf-PDMS
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85125-0
J.E. Hunt, T.J. Michalski, J.J Katz
{"title":"252Cf-PDMS of chlorophyll photoreaction center models","authors":"J.E. Hunt,&nbsp;T.J. Michalski,&nbsp;J.J Katz","doi":"10.1016/0020-7381(83)85125-0","DOIUrl":"10.1016/0020-7381(83)85125-0","url":null,"abstract":"<div><p>Chemically modified chlorophylls and porphyrins have been studied by <sup>252</sup>Cf-plasma desorption mass spectrometry (PDMS). The <sup>252</sup>Cf-PDMS spectra of thin films show intense molecular ions and fragmentation from whicn we make reasonable assignments for compound identification. The <sup>252</sup>Cf-PDMS of two compounds, bis(10-hydroxybutoxy-methyl pheophorbide <span><math><mtext>a</mtext></math></span>)-1,4-dichlorophtalate and linear bis(tetraphenylporphyrin) are discussed.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85125-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86037569","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
252Cf-plasma desorption mass spectrometry multistop time digitizer 252cf -等离子解吸质谱多站时间数字化仪
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85130-4
B.T. Turko , R.D. Macfarlane , C.J. McNeal
{"title":"252Cf-plasma desorption mass spectrometry multistop time digitizer","authors":"B.T. Turko ,&nbsp;R.D. Macfarlane ,&nbsp;C.J. McNeal","doi":"10.1016/0020-7381(83)85130-4","DOIUrl":"10.1016/0020-7381(83)85130-4","url":null,"abstract":"<div><p>A multistop time digitizer is described which was designed specifically for <sup>252</sup>Cf-plasma desorption time-of-flight mass spectrometry. The digitizer is a high resolution time intervalometer capable of measuring the times of a number of stop events following a common start. A resolution of 78.125 ps is achieved. The time range can be varied from 5 ms to 320 ms in 16 steps. Stop event processing time takes less than one microsecond, enabling high resolution measurements of closely spaced bursts of events.</p><p>The digitizer consists of the following three modules. A clock module provides the accurate time reference including a precision time calibrator. An analog module contains a special tandem stretcher by which the high resolution and low differential nonlinearity are achieved. A digital module comprises the counting, logic and interface circuits. Up to four complete digitizers can be housed in and powered by a standard CAMAC crate.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85130-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83183782","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: 16
Desorption kinetics 解吸动力学
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85117-1
H.J. Kreuzer
{"title":"Desorption kinetics","authors":"H.J. Kreuzer","doi":"10.1016/0020-7381(83)85117-1","DOIUrl":"https://doi.org/10.1016/0020-7381(83)85117-1","url":null,"abstract":"<div><p>After a short survey of the problems in desorption kinetics we review the theory of phonon mediated physisorption kinetics at low coverage within the master equation approach (cascade model). A simplified Kramers-Fokker-Planck description is extracted. For finite coverage we review the mean field theory of multilayer physisorption and discuss the predicted compensation effect in the desorption rates around monolayer coverage. Lastly we look at photodesorption of molecules by resonant laser-molecular vibrational coupling.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85117-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137051165","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
Electronic excitation and desorption processes in solids under charged particle bombardment 带电粒子轰击下固体中的电子激发和解吸过程
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85119-5
R.H. Ritchie
{"title":"Electronic excitation and desorption processes in solids under charged particle bombardment","authors":"R.H. Ritchie","doi":"10.1016/0020-7381(83)85119-5","DOIUrl":"10.1016/0020-7381(83)85119-5","url":null,"abstract":"<div><p>A review is given of several aspects of charged particle energy losses in condensed matter. Emphasis is placed on the spatial distribution of energy deposition near the surface. The influence of collective bulk and surface modes on absorption processes is sketched. Comparison of coherent energy deposition in the infratrack and delta-ray energy deposition in the ultratrack is made. Theories of surface desorption of atoms and small molecules by ionizing radiation and the use of multi-hit and multi-target theory in the analysis of large biomolecule desorption are discussed.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85119-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84432578","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
Secondary ion emission of phenylalanine as function of primary ion charge 苯丙氨酸的二次离子发射随一次离子电荷的变化
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85111-0
W. Guthier , O. Becker , S.Della Negra , W. Knippelberg , Y. Le Beyec , U. Weikert , K. Wien , P. Wieser , R. Wurster
{"title":"Secondary ion emission of phenylalanine as function of primary ion charge","authors":"W. Guthier ,&nbsp;O. Becker ,&nbsp;S.Della Negra ,&nbsp;W. Knippelberg ,&nbsp;Y. Le Beyec ,&nbsp;U. Weikert ,&nbsp;K. Wien ,&nbsp;P. Wieser ,&nbsp;R. Wurster","doi":"10.1016/0020-7381(83)85111-0","DOIUrl":"10.1016/0020-7381(83)85111-0","url":null,"abstract":"<div><p>At the heavy ion accelerator UNILAC/GSI-Darmstadt Phenylalanine films of 2000 Å thickness evaporated onto Al-foils were irradiated by <sup>16</sup>N and <sup>238</sup>U ions having a fixed energy of 1.4 MeV/N. The yields of secondary ions ejected from the target surface were investigated as function of the primary ion charge q. Changing the charge state q/e from 2<sup>+</sup> to 49<sup>+</sup> an increase of ion yields is observed, which does not follow a straight q<sup>n</sup>-dependence. The same targets were also irradiated by <sup>4</sup>He<sup>2+</sup>ions of 1.37 MeV/N. The corresponding ion yields were 430 times lower than yields measured with <sup>14</sup>Ne<sup>2</sup>. Additionally the mass spectra obtained with heavy ions were compared with laser induced ion desorption. It turned out that the relative yields of laser ejected ions are very sensitive to the amount of energy absorbed in the target. - The results are discussed in the frame work of the modified lattice potential model of Watson and Tombrello (ref.1).</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85111-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80329264","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: 35
Multiparameter coincidence experiments to investigate desorptionmechanisms with heavy ions of Kr, Ag, U in the energy range of 0.1 MeV/u TO 5 MeV/u 在0.1 MeV/ U ~ 5 MeV/ U能量范围内研究重离子Kr、Ag、U解吸机理的多参数符合实验
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85113-4
S. Della Negra, D. Jacquet, I. Lorthiois, Y. Le Beyec, O. Becker, K. Wien
{"title":"Multiparameter coincidence experiments to investigate desorptionmechanisms with heavy ions of Kr, Ag, U in the energy range of 0.1 MeV/u TO 5 MeV/u","authors":"S. Della Negra,&nbsp;D. Jacquet,&nbsp;I. Lorthiois,&nbsp;Y. Le Beyec,&nbsp;O. Becker,&nbsp;K. Wien","doi":"10.1016/0020-7381(83)85113-4","DOIUrl":"10.1016/0020-7381(83)85113-4","url":null,"abstract":"<div><p>Experiments with heavy ion beams from accelerators have been performed to study the desorption of atomic and secondary ions. The shapes of the yield curves have been measured for energies of projectiles ranging from O.1 to about 5 MeV/u. Secondary electron yields have been measured in coïncidence with projectiles and secondary ions. A Different primary ion velocity dependence is found for electron and secondary ion yields.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85113-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83424719","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: 44
The evolution of 252Cf - plasma desorption mass spectroscopy 252Cf等离子解吸质谱的演变
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85099-2
D.F. Torgerson
{"title":"The evolution of 252Cf - plasma desorption mass spectroscopy","authors":"D.F. Torgerson","doi":"10.1016/0020-7381(83)85099-2","DOIUrl":"10.1016/0020-7381(83)85099-2","url":null,"abstract":"<div><p>The <sup>252</sup>Cf Time-of-Flight/Plasma Desorption Mass Spectroscopy method (<sup>252</sup>Cf TOF/PDMS) is an example of how technology transfer from one discipline to another can stimulate new approaches to the solutions of important problems. The <sup>252</sup>Cf TOF/PDMS technique evolved from three technologies originally developed by Macfarlane and his co-workers to study nuclear processes: the electrostatic particle guide, the helium-jet recoil transport method, and the on-line β-recoil mass spectrometer. In this paper, these techniques are reviewed, and their contributions to the ultimate development of <sup>252</sup>Cf TOF/PDMS are discussed.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85099-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87324784","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
Ion-containing polymers: A new matrix for 252Cf-plasma desorption mass spectrometry 含离子聚合物:252cf等离子解吸质谱的新基质
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85128-6
E.A. Jordan, R.D. Macfarlane, C.R. Martin, C.J. McNeal
{"title":"Ion-containing polymers: A new matrix for 252Cf-plasma desorption mass spectrometry","authors":"E.A. Jordan,&nbsp;R.D. Macfarlane,&nbsp;C.R. Martin,&nbsp;C.J. McNeal","doi":"10.1016/0020-7381(83)85128-6","DOIUrl":"10.1016/0020-7381(83)85128-6","url":null,"abstract":"<div><p>One problem encountered in the mass spectrometry of solid materials is the complex interactions that take place on the surface during the ion-induced desorption process (PDMS)<sup>1</sup>. One possible way to reduce the complexity of this system is to develop a matrix that can control the adsorption site of the molecule of interest. It is possible that ion-containing polymers such as Nafion<sup>2</sup> (used in this study) can aid in this process.</p></div>","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85128-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91417896","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: 43
Some reminiscences of the early days of californium 加利福尼亚早期的一些回忆
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85098-0
Albert Ghiorso
{"title":"Some reminiscences of the early days of californium","authors":"Albert Ghiorso","doi":"10.1016/0020-7381(83)85098-0","DOIUrl":"https://doi.org/10.1016/0020-7381(83)85098-0","url":null,"abstract":"","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7381(83)85098-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91644064","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
252Cf-plasma desorption mass spectrometry of covalently bound nucleic acid adducts: Psoralen-nucleosides photoadducts 共价结合核酸加合物的等离子解吸质谱分析:补骨脂素核苷光加合物
International Journal of Mass Spectrometry and Ion Physics Pub Date : 1983-09-20 DOI: 10.1016/0020-7381(83)85103-1
P. Vigny, M. Spiro, F. Gaboriau, Y. Beyec, S. Negra, J. Cadet, L. Voituriez
{"title":"252Cf-plasma desorption mass spectrometry of covalently bound nucleic acid adducts: Psoralen-nucleosides photoadducts","authors":"P. Vigny, M. Spiro, F. Gaboriau, Y. Beyec, S. Negra, J. Cadet, L. Voituriez","doi":"10.1016/0020-7381(83)85103-1","DOIUrl":"https://doi.org/10.1016/0020-7381(83)85103-1","url":null,"abstract":"","PeriodicalId":13998,"journal":{"name":"International Journal of Mass Spectrometry and Ion Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87053919","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
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