A resonance enhanced multiphoton ionization study of the gerade excited states of Xe2 with a Xe 1S+Xe* 6s[3/2]1 dissociation limit

Abstract

A resonance enhanced multiphoton ionization study of the gerade excited states of XeC2 with a Xe E1SC0 + XeE* 6s[3/2]C1 dissociation limit Koeckhoven, S.M.; Buma, W.J.; de Lange, C.A. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Low-lying gerade electronically excited states of the Xe dimer, viz., 1 g and 0 g ϩ , with a Xe 1 S 0 ϩXe* 6s[3/2] 1 dissociation limit have been investigated using two-photon resonance enhanced multiphoton ionization techniques. High resolution is achieved by using this method in combination with a supersonic expansion. Moreover, the mass-resolved ion detection used in the present experiments has led to the observation of both vibrationally well-resolved spectra and continuous features, allowing the bound and dissociative parts of the excited states to be investigated separately. All spectra have been measured under both linearly and circularly polarized excitation conditions, enabling an unambiguous assignment of the signals. On the basis of FranckCondon calculations information on the potential energy curves of the bound and dissociative parts of the excited states has been obtained.

A Theoretical Study of theDynamics of Vibrational WavePackets in the 1g State Of Xe2

“…The electronic potentials of Xe2 are represented by Morse functions with molecular constants fitted to the available spectroscopic data [10][11][12]. We assume that the molecule is in its ground electronic and vibrational state, e.g., following supersonic expansion.…”

Infrared luminescence of Xe<inf>2</inf> excimers produced by electron impact in dense gas

“…The kinetics of the processes leading to the formation and decay of excimers has been investigated at low pressures in several spectral-and time-resolved experiments in which lifetimes and rate constants have been determined [10][11][12][13], whereas the structure of the lowest lying excimer states has been investigated theoretically [14,15] and spectroscopically [16,17].…”

Infrared emission spectrum and potentials of 0+uand 0+gstates of Xe2excimers produced by electron impact

“…The excimer structure has been investigated theoretically with ab initio [14,15] or model [16] calculations of the molecular potentials and experimentally by analyzing spectroscopic data [7,10,17,18,19].…”

“…The difference between the best fit potential and the theoretical one for R = R e ′ is ≈ 880 cm −1 . No comparison can be made with the experimental determination of the dissociative potential of this state accomplished by REMPI techniques [19] because selective multiphoton excitation from the molecular ground state samples the potential for R much larger than in the present case.…”

“…The two continua are thus produced by two different VUV emission processes whose kinetics accounts for the observation that at low pressure (P < 2 · 10 4 Pa) lumiscence is due to the 1st continuum, whereas it consists of the 2nd one for P > 5 · 10 4 Pa [13]. The excimer structure has been investigated theoretically with ab initio [14,15] or model [16] calculations of the molecular potentials and experimentally by analyzing spectroscopic data [7,10,17,18,19].…”