Franz Wallimann

Publications (2)3.09 Total impact

• Article: Electronic spectroscopy of the Au(6p)-Kr complex.

  Richard J Plowright, Mark J Watkins, Adrian M Gardner, Timothy G Wright, W H Breckenridge, Franz Wallimann, Samuel Leutwyler
  [show abstract] [hide abstract]
  ABSTRACT: We report electronic absorption spectra, recorded using one- and two-color resonance-enhanced multiphoton ionization spectroscopy, of the Au-Kr complex. The transition is localized on the gold atom, and corresponds to a 6p<--6s atomic excitation; we observe transitions to the D (2)Pi(1/2) and D (2)Pi(3/2) spin-orbit states. In addition, we report the results of ab initio calculations, which consider electronic states arising from the 6 (2)S, 5 (2)D, and 6 (2)P atomic energy levels of Au. Further, we also report an accurate value for the dissociation energy of the ground state of Au-Kr, based on basis set extrapolated RCCSD(T) calculations. The experimental results are discussed in the light of the theoretical ones.
  The Journal of chemical physics 11/2008; 129(15):154315. · 3.09 Impact Factor
• Article: Isotopically resolved $\tilde{B} \leftarrow \tilde{X}$ electronic spectrum of Ag$_3$ and calculation of its Jahn-Teller effects

  Franz Wallimann, Hans-Martin Frey, Samuel Leutwyler, Mark Riley
  [show abstract] [hide abstract]
  ABSTRACT: Ag3_3 was produced by pulsed-nozzle laser vaporisation and jet-cooled in a Ne supersonic expansion. One-color resonant two-photon ionisation (R2PI) spectra of the [(B)\tilde] 2E" ¬ [(X)\tilde]2 E¢\tilde B ^2E'' \leftarrow \tilde X^2 E' transition of Ag3_3 were separately measured for all four isotopic combinations. Long vibrational progressions are observed, involving clearly resolved bands at low energy, merging into a dense but resolvable spectrum up to 1000 cm-1^{-^1} above the origin. Both the ground [(X)\tilde]2E¢\tilde X^2E' and excited [(B)\tilde]2E"\tilde B^2E'' states of Ag3_3 are susceptible to Jahn-Teller distortion along the degenerate e¢e' bending coordinate. The Jahn-Teller analysis includes both linear and quadratic terms, simultaneously with the spin-orbit coupling. Following extensive parameter fitting, the absorption spectrum is calculated, and bands assigned. The spin-orbit splitting is quenched below the localization energy, but becomes observable » 300\approx 300 cm-1^{-1} above the origin.
  Zeitschrift für Physik D 04/1997; 40(1):30-35.