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Please use this identifier to cite or link to this item: https://olympias.lib.uoi.gr/jspui/handle/123456789/17462
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dc.contributor.authorGraham, P.en
dc.contributor.authorLedingham, K. W. D.en
dc.contributor.authorSinghai, R. P.en
dc.contributor.authorHankin, S. M.en
dc.contributor.authorMcCanny, T.en
dc.contributor.authorFang, X.en
dc.contributor.authorKosmidis, C.en
dc.contributor.authorTzallas, P.en
dc.contributor.authorTaday, P. F.en
dc.contributor.authorLangley, A. J.en
dc.date.accessioned2015-11-24T18:39:36Z-
dc.date.available2015-11-24T18:39:36Z-
dc.identifier.issn0953-4075-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/17462-
dc.rightsDefault Licence-
dc.subjectfemtosecond laser interactionsen
dc.subjectmethyl-iodide clustersen
dc.subjectcoulomb explosionen
dc.subjectspatial alignmenten
dc.subjectintenseen
dc.subjectfieldsen
dc.subjectorientationen
dc.subjectionizationen
dc.subjectnmen
dc.titleOn the fragment ion angular distributions arising from the tetrahedral molecule CH3Ien
heal.typejournalArticle-
heal.type.enJournal articleen
heal.type.elΆρθρο Περιοδικούel
heal.identifier.secondary<Go to ISI>://000172118400015-
heal.identifier.secondaryhttp://iopscience.iop.org/0953-4075/34/20/312/pdf/0953-4075_34_20_312.pdf-
heal.languageen-
heal.accesscampus-
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιώνel
heal.publicationDate2001-
heal.abstractThe mass spectra for both horizontal and vertical polarizations and the angular distributions of fragment ions arising from Coulomb explosion of tetrahedral methyl iodide (CH3I) ions, obtained at a laser intensity of 10(16) W cm(-2) are presented. All fragment ion distributions are peaked along the direction corresponding to collinearity of the,laser electric field with the time-of-flight mass spectrometer axis. The In+ ion (n less than or equal to 7) angular distributions from the dissociation of the parent ions are all of similar widths, which would imply a geometric, as opposed to dynamic, alignment. Additionally, the lower-charged I ions have an isotropic component that decreases as the charge state increases. Measurements of the CHm+ (m less than or equal to 3), Cp+ (p less than or equal to 4) and H+ ion distributions show that these are also maximal along the polarization direction. Furthermore, there is also a CH22+ ion peak present in the CH, group, which has a distribution similar to those measured for the other ions., This mass peak is the prominent multi-charged ion in this group. As the CH3I molecule is initially tetrahedral, these results suggest that the molecular structure undergoes a change such that the H-C and C-I bonds tend to lie along the field. Several authors have described work which first aligned CH3I molecules. with a nanosecond laser and then photodissociated with a femtosecond laser,, to produce fragment ion distributions. This is the first time that the angular distributions from a tetrahedral molecule have been presented using femtosecond laser pulses only and in the case of CH3I, for fragments other than CH3+ and I+. The fragment energetics from the single CH3I molecule have been compared with those from recent work dealing with the Coulomb explosion of CH3I clusters.en
heal.journalNameJournal of Physics B-Atomic Molecular and Optical Physicsen
heal.journalTypepeer reviewed-
heal.fullTextAvailabilityTRUE-
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