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MO: Fachverband Molekülphysik

MO 20: Control (joint session MO/Q)

MO 20.3: Vortrag

Freitag, 13. März 2020, 14:30–14:45, f102

Electron-vibrational coupling dynamics in SF₆ — •Patrick Rupprecht¹, Lennart Aufleger¹, Alexander Magunia¹, Simon Heinze², Thomas Ding¹, Marc Rebholz¹, Stefano Amberg¹, Nikola Mollov¹, Felix Henrich¹, Maurits Haverkort², Christian Ott¹, and Thomas Pfeifer¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg — ²Universität Heidelberg, Institut für Theoretische Physik

Visible and infrared vibrational spectroscopy, probing non-localized electronic molecular states, is commonly used in chemistry and biology. In combination with core-level spectroscopy, studies of coherently coupled electronic and vibrational dynamics with site and element specificity are possible. We report on the investigation of sulfur hexafluoride (SF₆) using attosecond transient absorption spectroscopy driven by mJ-level, few-cycle 15 fs FWHM pulses centered at 1550 nm in the short-wave infrared (SWIR) spectral region. The excited 6a_1g, 2t_2g and 4e_g molecular states related to the sulfur L_2,3 absorption edge were probed. First, altering the absorption spectrum in the 160 eV to 200 eV soft X-ray (SXR) region under the presence of a strong SWIR field was demonstrated. Furthermore, varying the delay between the SXR and SWIR pulses resulted in an oscillatory behavior of the resonance lines’ intensities, with a leading SWIR pulse. The extracted oscillation period of (773 ± 16) cm⁻¹ matches the Raman-active symmetric breathing mode ν₁ = 775 cm⁻¹. This result implies sensitivity to nonresonant impulsive stimulated Raman scattering via probing electronic transitions to states localized near the sulfur atom.