Unusual fragmentation patterns from the dissociation of some small molecules
Φόρτωση...
Ημερομηνία
Συγγραφείς
Graham, P.
Fang, X.
Ledingham, K. W. D.
Singhal, R. P.
McCanny, T.
Smith, D. J.
Kosmidis, C.
Tzallas, P.
Langley, A. J.
Taday, P. F.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Laser and Particle Beams
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
The nonlinear interaction of molecular matter with the intense field of a linearly-polarized laser beam, allows the study of not only the ionization dynamics of the parent molecule, but also the angular distribution of the exploding fragments. This is carried out by rotating the polarization vector of the laser with respect to the laboratory reference frame. The angular distributions for the CS2, CO2, N2O, H2S, and CH3I molecular ions, at intensities of about 10(16) W cm(-2), are presented. The distributions seem to be dependent on the molecule under consideration, but common features are that the peripheral atoms of the molecule are ejected along the ToF-axis, and the central atom perpendicularly to it, whenever the polarization vector and ToF-axis are collinear. It would seem that the distributions for the lighter of the molecules are partly due to alignment via dipole moments induced by the laser, as the distributions narrow as their charge-state increases. This is indicative of a larger torque acting on the higher-charged precursor molecular ion, via the interaction of the field with the laser-induced dipole moment. On the other hand, the angular dependence of the heavier molecules studied, are thought to originate from a dependence of the ionization/dissociation probability of the molecular ion on the initial angle made between the molecular axis and the polarization vector, that is, a preferential ionization/dissociation process. Spatial alignment in the laser pulse, in this case, is not thought to occur since the peaks do not narrow as the ionic charge increases. Finally, the results for H2S and also N2O are particularly interesting, since distributions for up to S7+ are presented, while the N-distributions show both a parallel and perpendicular component of the distribution. Neither of these results has, to the author's knowledge, been previously observed.
Περιγραφή
Λέξεις-κλειδιά
intense laser fields, ti-sapphire laser, coulomb explosion, pendular states, multiphoton ionization, polyatomic-molecules, enhanced ionization, spatial alignment, brute force, pulses
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000169121400011
http://journals.cambridge.org/download.php?file=%2FLPB%2FLPB18_03%2FS0263034600183107a.pdf&code=c27a6c9887b1e5417ed3eff3d6c22b2f
http://journals.cambridge.org/download.php?file=%2FLPB%2FLPB18_03%2FS0263034600183107a.pdf&code=c27a6c9887b1e5417ed3eff3d6c22b2f
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών