Soft-x-ray transient absorption spectroscopy of sulfur hexaflouride in strong SWIR fields

Published on Sep 14, 2020in Frontiers in Optics
· DOI :10.1364/FIO.2020.JTH4A.8
Patrick Rupprecht3
Estimated H-index: 3
(MPG: Max Planck Society),
Lennart Aufleger3
Estimated H-index: 3
(MPG: Max Planck Society)
+ 9 AuthorsThomas Pfeifer38
Estimated H-index: 38
(MPG: Max Planck Society)
Source
Abstract
We report on experimental soft-x-ray transient absorption spectroscopy in SF6. The influences of strong SWIR fields and of vibrational dynamics initiated by impulsive stimulated Raman scattering on the 6 a 1 g S 2 p 1 / 2 , 3 / 2 − 1 resonance are investigated.
References7
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Photoinduced quantum dynamics in molecules have hierarchical temporal structures with different energy scales that are associated with electron and nuclear motions. Femtosecond-to-attosecond transient absorption spectroscopy (TAS) using high-harmonic generation (HHG) with a photon energy below 300 eV has been a powerful tool to observe such electron and nuclear dynamics in a table-top manner. However, comprehensive measurements of the electronic, vibrational, and rotational molecular dynamics ha...
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Time-resolved x-ray absorption spectroscopy (TR-XAS) has so far practically been limited to large-scale facilities, to subpicosecond temporal resolution, and to the condensed phase. We report the realization of TR-XAS with a temporal resolution in the low femtosecond range by developing a tabletop high-harmonic source reaching up to 350 electron volts, thus partially covering the spectral region of 280 to 530 electron volts, where water is transmissive. We used this source to follow previously u...
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We report a previously undescribed spectroscopic probe that makes use of electrons rescattered during the process of high-order harmonic generation. We excite coherent vibrations in SF6 using impulsive stimulated Raman scattering with a short laser pulse. A second, more intense laser pulse generates high-order harmonics of the fundamental laser, at wavelengths of ≈20–50 nm. The high-order harmonic yield is observed to oscillate, at frequencies corresponding to all of the Raman-active modes of SF...
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The x-ray-absorption near-edge structure (XANES) of sulfur hexafluoride, SF[sub 6], in the gas phase has been measured with high energy resolution at the sulfur [ital L][sub 2,3] and fluorine [ital K] ionization thresholds using synchrotron radiation from the SX700/II monochromator at BESSY. Besides dominant transitions to core-excited inner-well states, several series of Rydberg states with vibrational fine structure were resolved below the sulfur [ital L][sub 2,3] thresholds. Using the Rydberg...
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We interpret the enhanced lines and frequent failure to detect Rydberg structure in the x‐ray absorption spectra of molecules in terms of ``inner‐well'' and ``outer‐well'' states which result from an effective potential barrier located near the electronegative atoms in the molecule. The K and LII, III spectra of sulfur in SF6 are discussed in detail and all prominent features are identified. X‐ray absorption spectra of molecules in which a B, S, or Si atom is combined with two or more electroneg...
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Exciton states in alkali halides are analyzed on the basis of the energy band picture. First the excitons at the point \(\varGamma\) are discussed. A simple treatment in which the spin-orbit and the electron-hole exchange interactions are taken into account indicates that the intensity ratio of the halogen doublet is fairly sensitive to the exchange energy, while the doublet splitting is not very sensitive. It is shown that a pure triplet exciton state exists below the first allowed exciton stat...
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