An investigation of the angular distributions of fragment ions arising from the linear CS(2) and CO(2) molecules
Φόρτωση...
Ημερομηνία
Συγγραφείς
Graham, P.
Ledingham, K. W. D.
Singhal, R. P.
McCanny, T.
Hankin, S. M.
Fang, X.
Smith, D. J.
Kosmidis, C.
Tzallas, P.
Langley, A. J.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Physics B-Atomic Molecular and Optical Physics
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
The nonlinear interaction of the triatomic molecules CS(2) and CO(2) with the intense field of a linearly polarized laser beam of femtosecond (fs) pulse duration, was used to study the ionization and dissociation of the parent molecule. The fragment ion angular distributions arising from the Coulomb explosion of the parent ions were also measured. For CS(2), the angular distributions of CS(2)(+), CS(2)(2+), CS(2)(3+), CS(+), CS(2+), S(n+) (n less than or equal to 6) and C(m+) (m less than or equal to 4) ions are presented for a laser intensity of 1 x 10(16) W cm(-2) at a wavelength of 790 nm and pulse duration of 50 fs. The angular distributions of the parent molecular ions are all isotropic. The S(n+) fragments are peaked along the time-of-flight (TOF) axis, whereas the C(m+) fragments explode perpendicularly to this. Similar results for CO(2) are also presented for comparison. The S ion distributions do nor narrow as their ionic charge increases, and it is argued that the angular distributions for CS(2) are due mainly to the angular dependence of the ionization probability On the other hand, the distributions from the lighter CO(2) molecule are thought to be at least partly due to alignment via dipole moments induced by the laser, as in this case the O(n+) angular distributions are seen to narrow as their charge increases. The conclusion of these results is that the laser pulse may be too short for the CS(2) molecule to align in the pulse. Angular distributions are also presented for varying laser pulse durations, in the range of 50 fs to 300 ps. The dynamics of the ionization/dissociation mechanism are discussed in the context of the TOF mass spectra and angular distributions recorded for CS(2).
Περιγραφή
Λέξεις-κλειδιά
intense laser fields, ti-sapphire laser, coulomb explosion, dissociative ionization, multiphoton ionization, enhanced ionization, diatomic-molecules, spatial alignment, pendular states, brute force
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000084310500013
http://iopscience.iop.org/0953-4075/32/23/310/pdf/0953-4075_32_23_310.pdf
http://iopscience.iop.org/0953-4075/32/23/310/pdf/0953-4075_32_23_310.pdf
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