Computed fragmentation patterns of CH3CF3 in the experiment of Habenicht et al. (preceding paper) are reported. Fully statistical computations, subject only to conservation of energy, matter, and charge, fail to reproduce the experimental results. Introducing a site-specific constraint that distinguishes the two carbon atoms leads to a better but not complete agreement with experiment. Results are also presented for a site-selective resonant excitation to a Rydberg level. The parent ion is then singly charged, and the observed fragmentation pattern is more nonstatistical than for the doubly charged ("Coulomb explosion") parent ion. The highest excess energy (approximately 45 eV) of the parent ion (and the best agreement with experiment) is for the site-selective ionization from the 1s orbital localized at the fluorine-carrying carbon atom.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInternal energy effects on mass spectrometric fragmentationA. Danon, A. Amirav, J. Silberstein, I. Salman, and R. D. LevineCite this: J. Phys. Chem. 1989, 93, 1, 49–55Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 January 1989https://pubs.acs.org/doi/10.1021/j100338a015https://doi.org/10.1021/j100338a015research-articleACS PublicationsRequest reuse permissionsArticle Views196Altmetric-Citations29LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDependence of the branching ratio of C4H3+/C4H4+ on the parent ion energy in 2,4-hexadiyne ionic dissociation. Statistical theory and experimentE. L. Chronister, D. M. Szaflarski, M. A. El-Sayed, J. Silberstein, I. Salman, and R. D. LevineCite this: J. Phys. Chem. 1988, 92, 10, 2824–2827Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988https://pubs.acs.org/doi/10.1021/j100321a026https://doi.org/10.1021/j100321a026research-articleACS PublicationsRequest reuse permissionsArticle Views52Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts

Chemischer InformationsdienstVolume 17, Issue 18 Physical Organic Chemistry ChemInform Abstract: The Dominant Fragmentation Pathways in Multiphoton Ionization of Alkyl Iodides J. SILBERSTEIN, J. SILBERSTEINSearch for more papers by this authorN. OHMICHI, N. OHMICHISearch for more papers by this authorR. D. LEVINE, R. D. LEVINESearch for more papers by this author J. SILBERSTEIN, J. SILBERSTEINSearch for more papers by this authorN. OHMICHI, N. OHMICHISearch for more papers by this authorR. D. LEVINE, R. D. LEVINESearch for more papers by this author First published: May 6, 1986 https://doi.org/10.1002/chin.198618060AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume17, Issue18May 6, 1986 RelatedInformation

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe dominant fragmentation pathways in multiphoton ionization of alkyl iodidesJ. Silberstein, N. Ohmichi, and R. D. LevineCite this: J. Phys. Chem. 1985, 89, 26, 5606–5613Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissue 1 December 1985https://pubs.acs.org/doi/10.1021/j100272a009https://doi.org/10.1021/j100272a009research-articleACS PublicationsRequest reuse permissionsArticle Views27Altmetric-Citations14LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA quantitative theory of mass spectral fragmentation patternsJ. Silberstein and R. D. LevineCite this: J. Am. Chem. Soc. 1985, 107, 26, 8283–8284Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissue 1 December 1985https://pubs.acs.org/doi/10.1021/ja00312a090https://doi.org/10.1021/ja00312a090research-articleACS PublicationsRequest reuse permissionsArticle Views63Altmetric-Citations5LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

The ionic fragmentation pattern of SO2 was measured as a function of laser power at the 223–220 nm wavelength range. The time of flight (TOF) mass spectrum shows essentially no parent ions. The principal ions observed were SO+ and mass 32. The fraction of S+ ions increases monotonically with increasing laser power while the fraction of SO+ which dominates at low powers reaches a maximum and falls below that of S+. The fraction of both ions changes nonlinearly with the laser intensity and tends to level off at the higher powers. The results are found consistent with a statistical (maximum entropy) computation of the fragmentation pattern. By comparing the observed (S+ + )/SO+ branching ratio vs. laser power with the computed branching ratio vs. energy uptake per parent molecule one obtains an energy uptake vs. laser power curve. The results are discussed in terms of the possible dissociation/ionization pathways.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBranching ratio for the unimolecular dissociation of energy-selected benzene ions via a statistical approachJ. Silberstein, I. Salman, and R. D. LevineCite this: J. Phys. Chem. 1985, 89, 26, 5573–5575Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissue 1 December 1985https://pubs.acs.org/doi/10.1021/j100272a003https://doi.org/10.1021/j100272a003research-articleACS PublicationsRequest reuse permissionsArticle Views35Altmetric-Citations1LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe nonstatistical multiphoton ionization-dissociation of the van der Waals toluene dimerJ. Silberstein, N. Ohmichi, and R. D. LevineCite this: J. Phys. Chem. 1984, 88, 21, 4952–4955Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 October 1984https://pubs.acs.org/doi/10.1021/j150665a031https://doi.org/10.1021/j150665a031research-articleACS PublicationsRequest reuse permissionsArticle Views29Altmetric-Citations7LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts

AbstractObserved ionic fragmentation patterns are compared against the extreme statistical limit. A quantitative measure of closeness of fit is employed to assess the need for refinements in the theory and in the noise level of the experiment. It is concluded that for such molecules as benzene or toluene there is no compelling reason to go beyond the extreme statistical limit in order to account for the observed fragmentation patterns. There is some indication for meaningful deviances in MPI‐D of aliphatic compounds.

The relative importance of the different possible fragmentation pathways in multiphoton ionization—fragmentation is determined by a maximum entropy formalism. Absorption by fragment ions is allowed for, and leads to significantly lower temperatures. Differences between electron impact and laser-induced mass spectra are possibly due to the absence of secondary absorption in the former.

Chemischer InformationsdienstVolume 13, Issue 15 Preparative Organic Chemistry ChemInform Abstract: STATISTICAL FRAGMENTATION PATTERNS IN MULTIPHOTON IONIZATION: A COMPARISON WITH EXPERIMENT J. SILBERSTEIN, J. SILBERSTEINSearch for more papers by this authorR. D. LEVINE, R. D. LEVINESearch for more papers by this author J. SILBERSTEIN, J. SILBERSTEINSearch for more papers by this authorR. D. LEVINE, R. D. LEVINESearch for more papers by this author First published: April 13, 1982 https://doi.org/10.1002/chin.198215149Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume13, Issue15April 13, 1982 RelatedInformation

Branching fractions for the MPD into electronically excited species, both neutral and ionic, are computed in the statistical limit. Extensive population of excited states is found, particularly so for the smaller fragments. Examples include the formation of excited states of C2 and CH from ethylene or benzene and of Fe(I) and Fe(II) from Fe(CO)5.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIon-pair formation in multiphoton fragmentationN. Ohmichi, J. Silberstein, and R. D. LevineCite this: J. Phys. Chem. 1981, 85, 23, 3369–3371Publication Date (Print):November 1, 1981Publication History Published online1 May 2002Published inissue 1 November 1981https://pubs.acs.org/doi/10.1021/j150623a004https://doi.org/10.1021/j150623a004research-articleACS PublicationsRequest reuse permissionsArticle Views25Altmetric-Citations6LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts

Breakdown curves computed in the statistical limit are presented for benzene, toluene, t-butylbenzene, triethylenediamine, and iodomethane. The statistical limit is that of the fragmentation pattern of maximal entrophy (subject only to conserved quantities). In this limit the fragmentation pattern is governed by the mean energy 〈E〉 absorbed per molecule. By varying 〈E〉 it is found possible to span the range from low to extensive fragmentation. For the five molecules tested, the statistical limit reproduces the experimental multiphoton ionization-fragmentation patterns reported by Lichtin, Bernstein, and Newton as is expected on the basis of their experimental, ’’alternative doorway’’ appraisal. Another prediction, not yet tested by experiment, is that in the statistical limit it should prove possible to obtain similar fragmentation patterns for different isomers (e.g., naphthalene and azulene). Internal state distributions offer a third way in which the statistical limit can be compared with experiment.

The simplest statistical theory wherein the mass spectral fragmentation pattern is governed by the mean energy is derived and compared with the observed results for resonance-enhanced multiphoton ionization of benzene. By varying the mean energy absorbed it is possible to span the range of different patterns up to the dominance of C+1ions above 37 eV/molecule.

Research Articles| October 03 2008 Chronic Bronchitis and Emphysema (CBE): A Survey of Patients Referred to a Centre for Prevention of Lung Diseases (Jerusalem, 1966/1967) Subject Area: Further Areas , Oncology , Pathology and Cell Biology J. Cohen; J. Cohen Division of Epidemiology and Division of Chronic Diseases, Ministry of Health; Pulmonary Laboratory, Hebrew University, Hadassah Medical School, and Rokah Center for Prevention of Chest Diseases, Jerusalem Search for other works by this author on: This Site PubMed Google Scholar I. Bruderman; I. Bruderman Division of Epidemiology and Division of Chronic Diseases, Ministry of Health; Pulmonary Laboratory, Hebrew University, Hadassah Medical School, and Rokah Center for Prevention of Chest Diseases, Jerusalem Search for other works by this author on: This Site PubMed Google Scholar M. Rosenberg; M. Rosenberg Division of Epidemiology and Division of Chronic Diseases, Ministry of Health; Pulmonary Laboratory, Hebrew University, Hadassah Medical School, and Rokah Center for Prevention of Chest Diseases, Jerusalem Search for other works by this author on: This Site PubMed Google Scholar J. Silberstein; J. Silberstein Division of Epidemiology and Division of Chronic Diseases, Ministry of Health; Pulmonary Laboratory, Hebrew University, Hadassah Medical School, and Rokah Center for Prevention of Chest Diseases, Jerusalem Search for other works by this author on: This Site PubMed Google Scholar Ever Hadani; Ever Hadani Division of Epidemiology and Division of Chronic Diseases, Ministry of Health; Pulmonary Laboratory, Hebrew University, Hadassah Medical School, and Rokah Center for Prevention of Chest Diseases, Jerusalem Search for other works by this author on: This Site PubMed Google Scholar M. Haber M. Haber Division of Epidemiology and Division of Chronic Diseases, Ministry of Health; Pulmonary Laboratory, Hebrew University, Hadassah Medical School, and Rokah Center for Prevention of Chest Diseases, Jerusalem Search for other works by this author on: This Site PubMed Google Scholar Pathologia et Microbiologia (1970) 35 (1-3): 171–175. https://doi.org/10.1159/000162220 Article history Published Online: October 03 2008 Content Tools Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation J. Cohen, I. Bruderman, M. Rosenberg, J. Silberstein, Ever Hadani, M. Haber; Chronic Bronchitis and Emphysema (CBE): A Survey of Patients Referred to a Centre for Prevention of Lung Diseases (Jerusalem, 1966/1967). Pathologia et Microbiologia 31 December 1970; 35 (1-3): 171–175. https://doi.org/10.1159/000162220 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsPathobiology Search Advanced Search This content is only available via PDF. 1970Copyright / Drug Dosage / DisclaimerCopyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements. Article PDF first page preview Close Modal You do not currently have access to this content.