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- Kjeldgaard, Lisbeth, et al.
(author)
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Intramolecular vibronic dynamics in molecular solids: C60
- 2005
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In: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 72:20
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Journal article (peer-reviewed)abstract
- Vibronic coupling in solid C60 has been investigated with a combination of resonant photoemission spectroscopy (RPES) and resonant inelastic x-ray scattering (RIXS). Excitation as a function of energy within the lowest unoccupied molecular orbital resonance yielded strong oscillations in intensity and dispersion in RPES, and a strong inelastic component in RIXS. Reconciling these two observations establishes that vibronic coupling in this core hole excitation leads to predominantly inelastic scattering and localization of the excited vibrations on the molecule on a femtosecond time scale. The coupling extends throughout the widths of the frontier valence bands.
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- Kristan, Matej, et al.
(author)
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The first visual object tracking segmentation VOTS2023 challenge results
- 2023
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In: 2023 IEEE/CVF International conference on computer vision workshops (ICCVW). - : Institute of Electrical and Electronics Engineers Inc.. - 9798350307443 - 9798350307450 ; , s. 1788-1810
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Conference paper (peer-reviewed)abstract
- The Visual Object Tracking Segmentation VOTS2023 challenge is the eleventh annual tracker benchmarking activity of the VOT initiative. This challenge is the first to merge short-term and long-term as well as single-target and multiple-target tracking with segmentation masks as the only target location specification. A new dataset was created; the ground truth has been withheld to prevent overfitting. New performance measures and evaluation protocols have been created along with a new toolkit and an evaluation server. Results of the presented 47 trackers indicate that modern tracking frameworks are well-suited to deal with convergence of short-term and long-term tracking and that multiple and single target tracking can be considered a single problem. A leaderboard, with participating trackers details, the source code, the datasets, and the evaluation kit are publicly available at the challenge website1
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| 4. |
- Käämbre, Tanel, et al.
(author)
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Bulk electronic structure of K3C60 as revealed by soft x-rays
- 2007
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In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 75:19, s. 195432-
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Journal article (peer-reviewed)abstract
- We present C 1s x- ray absorption, x- ray emission, and resonant inelastic x- ray scattering (RIXS ) spectra of single- phase crystalline K3C60. The comparison to valence- band photoelectron spectra from the same sample facilitates identification of the contribution from surface and bulk electronic states in the latter. Bulk- sensitive techniques show that the valence bands of K3C60 and pure C-60 are characterized by spectral features of similar width, in agreement with the predictions of band- structure calculations. Symmetry selectivity in the RIXS process allows us to assign peaks in the C 1s absorption spectrum, demonstrating a close correspondence with pure C-60 also in the conduction band. The symmetry selectivity is as pronounced in K3C60 as in pure C-60, indicating that the local C-60 symmetry is not appreciably affected by the K doping, either in the ground state or intermediate state, on the time scale of 6 fs.
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- Qian, Limin
(author)
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Soft X-Ray Spectroscopic Study of Fullerene Based Transition-Metal Compounds and Related Systems
- 2001
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Doctoral thesis (other academic/artistic)abstract
- This thesis addresses the electronic and geometric structures of fullerene based transition-metal compounds and other related systems. The formation of TixC60, VxC60 and NbxC60 compounds has been examined by X-ray photoelectron, soft X-ray absorption and emission and spectroscopy techniques, including resonant inelastic X-ray scattering (RIXS). The symmetry and character of the chemical bond of transition metal-fulleride has been determined. A related study of single-walled carbon nanotubes is also presented. The experimental results are compared to predictions based on calculation within a C60Tix(x=1, 2) cluster model using gradient corrected density functional theory. Good agreement between theory and experiment is found with the Ti metal atom coordinated to the six-ring site. The formation of transition metal fullerides is due to hybridization between the orbitals of the transition metal atoms and the C60 orbitals, and the RIXS spectra at the C K edge reveals the symmetry of the chemical bond. X-ray emission spectra of VxC60 and NbxC60 are similar to that of TixC60, suggesting that the chemical bond has the same symmetry in these compounds. These results indicate that the RIXS method provides an excellent basis for the probing of the bonding between metals and organic molecules. Non-resonantly excited X-ray emission spectra of carbon nanotubes are similar to those of graphite. At resonant excitation, however, there are pronounced differences, suggesting that the σ-π hybridization is reflected in the spectra.
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