Zero electron kinetic energy spectroscopy of the ArCl− anion

Abstract

Zero electron kinetic energy ͑ZEKE͒ spectroscopy has been utilized to study the 40 Ar 35 Cl Ϫ anion and the X1/2, I3/2 and II1/2 electronic states of neutral ArCl. Well-resolved progressions in the low-frequency vibrations of the anion and the neutral complexes are observed in the ZEKE spectra. From our spectroscopic data we construct model potential functions for the anion and three neutral states. This yields refined values for the neutral state splittings and the first accurate experimental ArCl Ϫ anion potential. Absolute uncertainties for R m and ⑀ in all potentials are estimated to be Ϯ0.08 Å and Ϯ0.6 meV, respectively.

Amplification of Anharmonicities in Multiphoton Vibrational Action Spectra

“…The parameters B ij , C ij for the pairs Ar-Na + and Ar-Cl À , as well as the polarizability of argon, were taken from references [15,16] (for ArCl À ), and [17] (for ArNa + ). For the present potential, the dipole momentmðRÞ essentially depends on the charges' motion, but there is also a contribution from induced dipoles [Eq.…”

Studies of anions from sputtering III: The 41K background in measurement by AMS

“…KF À 3 is considered fragile in the sense that molecules like ArCl À are fragile. These may have an electron binding energy P3.66 eV, and so by definition are superhalogen anions, but are almost unbound to breakup into Ar + Cl À by only $50 meV [10]. We have yet to find measurements of the magnitude of the last F-bond strength in CaF À 3 and KF À 3 to show their significant difference.…”

Theoretical study of Cl−RG (rare gas) complexes and transport of Cl− through RG (RG = He–Rn)

“…A complete listing of the tabulated potential values is given as supplementary material 63 The spectroscopic constants derived from the LEVEL program 64 for Cl − -RG are given in Table II. Neumark's group have derived R e and D e values from potentials which had been fitted to ZEKE spectra. 16 They obtained R e and D e values of 3.71 ± 0.08 Å and 523 ± 5 cm −1 for Cl − -Ar. Distelrath and Boesl 18 have also studied Cl − -Ar using ZEKE spectroscopy, and they used two different methods to calculate D e .…”

“…In addition to those already mentioned, mobility measurements have been made by Dotan et al 44 and by Viggiano et al 45 Diffusion coefficients have been obtained by Eisele et al 11 Cross sections and transport properties for Cl − -RG (RG = He-Xe) have been presented by Petrović et al 46 using momentum transfer theory and Monte Carlo simulations. Experimental ZEKE spectra have been obtained for Cl − -RG (RG = ArXe) by Neumark's group 16,17,20 and for Cl − -Ar by Distelrath and Boesl. 18 To our knowledge, there has been no previous ab initio work on Cl − -RG complexes involving Xe or Rn, no transport measurements involving Rn, and no spectroscopy involving He, Ne, or Rn.…”

“…4 We now extend this to the corresponding complexes involving Cl − , for which a considerable amount of transport data is available [5][6][7][8][9][10][11][12][13] but only limited scattering 14,15 and spectroscopic data. [16][17][18][19][20] In 1981, mobility and diffusion data 9,10 for Cl − ions in Xe were used 21 to test the well depth of the potential that had been inferred from differential scattering cross sections. 14 The transport data suggested a lower bound of 0.11 eV, while the scattering data gave an upper limit of 0.14 eV; both were consistent with the value of 0.135 eV found 13 by direct inversion 23 of the mobility data, but were substantially smaller than the earlier estimate by Riveros et al 22 Also in 1981, Viehland et al 24 used existing mobility and diffusion data [7][8][9][10] for Cl − ions in Ar to check the accuracy of a Hartree-Fock potential 25 for the system and of a potential inferred from scattering measurements with ion beams.…”