| 1. |
- Patthey, L, et al.
(författare)
-
Adsorption of bi-isonicotinic acid on rutile TiO2(110)
- 1999
-
Ingår i: JOURNAL OF CHEMICAL PHYSICS. - 0021-9606. ; 110:12, s. 5913-5918
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Bi-isonicotinic acid (2,2'-bipyridine- 4,4'-dicarboxylic acid) is the ligand of several organometallic dyes, used in photoelectrochemical applications. Therefore the atomic scale understanding of the bonding of this molecule to rutile TiO2(110) should giv
|
|
| 2. |
- Rensmo, Håkan, et al.
(författare)
-
The electronic structure of the cis-bis(4,4'-dicarboxy-2,2'-bipyridine)-bis(isothiocyanato) ruthenium(II) complex and its ligand 2,2'-bipyridyl-4,4'-dicarboxylic acid studied with electron spectroscopy
- 1997
-
Ingår i: CHEMICAL PHYSICS LETTERS. - : ELSEVIER SCIENCE BV. - 0009-2614. ; 274:1-3, s. 51-57
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The electronic structure of the dye complex cis-bis(4,4'-dicarboxy-2,2'-bipyridine)-bis(isothiocyanato)ruthenium(II) as well as that of its ligand 2,2'-bipyridine-4,4'-dicarboxylic acid has been investigated with electron spectroscopy. Valence level spect
|
|
| 3. |
|
|
| 4. |
- Schnadt, J, et al.
(författare)
-
Excited-state charge transfer dynamics in systems of aromatic adsorbates on TiO2 studied with resonant core techniques
- 2003
-
Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 119:23, s. 12462-12472
-
Tidskriftsartikel (refereegranskat)abstract
- Resonant core spectroscopies are applied to a study of the excited electron transfer dynamics on a low-femtosecond time scale in systems of aromatic molecules (isonicotinic acid and bi-isonicotinic acid) adsorbed on a rutile TiO2(110) semiconductor surface. Depending on which adsorbate state is excited, the electron is either localized on the adsorbate in an excitonic effect, or delocalizes rapidly into the substrate in less than 5 fs (3 fs) for isonicotinic acid (bi-isonicotinic acid). The results are obtained by the application of a variant of resonant photoemission spectroscopy. (C) 2003 American Institute of Physics.
|
|
| 5. |
|
|
| 6. |
- Seidel, M., et al.
(författare)
-
Multi-pass Cell Based Nonlinear Pulse Compression of Yb : YAG Pump-Probe Lasers at FLASH
- 2023
-
Ingår i: X-Ray Free-Electron Lasers : Advances in Source Development and Instrumentation VI - Advances in Source Development and Instrumentation VI. - 1996-756X .- 0277-786X. - 9781510662827 ; 12581
-
Konferensbidrag (refereegranskat)abstract
- The majority of user experiments at the high repetition-rate free electron laser (FEL) facility FLASH are of pump-probe type, combining the extreme ultraviolet (XUV) or soft x-ray radiation from the FEL with ultrashort pulses generated by optical lasers. In this contribution, we demonstrate the advantages of using high-power Yb:YAG lasers with subsequent nonlinear pulse compression stages based on multi-pass cells (MPC). The approach enables the combination of hundreds of kHz to MHz repetition-rates, hundreds of watts of average powers and excellent intensity stabilities. We present the characteristics of the MPC-based pump-probe laser at the FLASH plane-grating beamlines. Furthermore, we report pulse compression to 8.2 fs pulse duration and the seeding of an optical parametric amplifier generating mid-IR radiation tunable from 1.4 µm to 16 µm.
|
|
| 7. |
- Abukawa, T, et al.
(författare)
-
Anomalous diffraction effect on the surface core-level photoemission from Si(001)2x1-Cs surface
- 1998
-
Ingår i: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA. - : ELSEVIER SCIENCE BV. - 0368-2048. ; 88, s. 539-543
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The angular dependence of the Si 2p photoelectron intensity has been measured for a Cs-saturated Si(001)2 x 1 surface. A surface Si 2p component, which is attributed to the Si-dimer underneath the Cs overlayer, shows a large intensity variation as a funct
|
|
| 8. |
- Chang, J., et al.
(författare)
-
Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2-xSrxCuO4
- 2013
-
Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 4, s. 2559-
-
Tidskriftsartikel (refereegranskat)abstract
- High-temperature superconductivity emerges from an un-conventional metallic state. This has stimulated strong efforts to understand exactly how Fermi liquids breakdown and evolve into an un-conventional metal. A fundamental question is how Fermi liquid quasiparticle excitations break down in momentum space. Here we show, using angle-resolved photoemission spectroscopy, that the Fermi liquid quasiparticle excitations of the overdoped superconducting cuprate La1.77Sr0.23CuO4 is highly anisotropic in momentum space. The quasiparticle scattering and residue behave differently along the Fermi surface and hence the Kadowaki-Wood's relation is not obeyed. This kind of Fermi liquid breakdown may apply to a wide range of strongly correlated metal systems where spin fluctuations are present.
|
|
| 9. |
- Chang, J., et al.
(författare)
-
Electronic structure near the 1/8-anomaly in La-based cuprates
- 2008
-
Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 10
-
Tidskriftsartikel (refereegranskat)abstract
- We report an angle-resolved photoemission study of the electronic structure of the pseudogap state in La1.48Nd0.4Sr0.12CuO4 (T-c < 7 K). Two opposite dispersing Fermi arcs are the main result of this study. Several scenarios that can explain this observation are discussed.
|
|
| 10. |
- Fatuzzo, C. G., et al.
(författare)
-
Nodal Landau Fermi-liquid quasiparticles in overdoped La1.77Sr0.23CuO4
- 2014
-
Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 89:20, s. 205104-
-
Tidskriftsartikel (refereegranskat)abstract
- Nodal angle-resolved photoemission spectra taken on overdoped La1.77Sr0.23CuO4 are presented and analyzed. It is proven that the low-energy excitations are true Landau Fermi-liquid quasiparticles. We show that momentum and energy distribution curves can be analyzed self-consistently without quantitative knowledge of the bare band dispersion. Finally, by imposing Kramers-Kronig consistency on the self-energy Sigma, insight into the quasiparticle residue is gained. We conclude by comparing our results to quasiparticle properties extracted from thermodynamic, magnetoresistance, and high-field quantum oscillation experiments on overdoped Tl2Ba2CuO6+delta.
|
|
