Topic
Photoemission spectroscopy
About: Photoemission spectroscopy is a research topic. Over the lifetime, 10821 publications have been published within this topic receiving 250888 citations. The topic is also known as: photoelectron spectroscopy & PES.
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TL;DR: Using circularly polarized light combined with spin- and angle-resolved photoemission spectroscopy, the value of the effective spin-orbit coupling is directly measured to be 130±30 meV, even larger than theoretically predicted and comparable to the energy splitting of the dxy and dxz,yz orbitals around the Fermi surface.
Abstract: Spin-orbit coupling has been conjectured to play a key role in the low-energy electronic structure of Sr2RuO4. By using circularly polarized light combined with spin- and angle-resolved photoemission spectroscopy, we directly measure the value of the effective spin-orbit coupling to be 130 � 30 meV. This is even larger than theoretically predicted and comparable to the energy splitting of the dxy and dxz;yz orbitals around the Fermi surface, resulting in a strongly momentum-dependent entanglement of spin and orbital character in the electronic wavefunction. As demonstrated by the spin expectation value h sk · s−ki calculated for a pair of electrons with zero total momentum, the classification of the Cooper pairs in terms of pure singlets or triplets fundamentally breaks down, necessitating a description of the unconventional superconducting state of Sr2RuO4 in terms of these newly found spin-orbital entangled eigenstates.
143 citations
23 May 2008
TL;DR: In this article, the core level electron excitation and ionization spectra of thymine and adenine have been investigated by photoabsorption and photoemission spectroscopy, and the results interpreted by means of ab initio calculations using the second-order algebraic-diagrammatic construction (ADC(2)) method for the polarization propagator and the fourth-order ADC method (adC(4)) for the one-particle Green's function.
Abstract: The core level electron excitation and ionization spectra of thymine and adenine have been investigated by photoabsorption and photoemission spectroscopy, and the results interpreted by means of ab initio calculations using the second-order algebraic–diagrammatic construction (ADC(2)) method for the polarization propagator and the fourth-order ADC method (ADC(4)) for the one-particle Green’s function. The photoabsorption spectra are dominated by transitions from core levels to unoccupied π states, but also show clear structures due to Rydberg transitions. The calculated spectra are in good agreement with the experimental results, and many of the observed structures are assigned.
143 citations
TL;DR: In this article, the growth of spinel ZnMd62O4 M=Co, Rh, and Ir, a ρ-type wide band gap semiconductor by pulsed laser deposition, was reported.
Abstract: The authors report on the growth of spinel ZnMd62O4 M=Co, Rh, and Ir, a ρ-type wide band gap semiconductor by pulsed laser deposition. The band gap of these compounds is determined by the ligand field splitting in the subbands of the metallic d6 cation. Photoemission spectroscopy revealed that the valence band maximum is composed of occupied t2g 6 states. The observed band gap is increasing for higher quantum numbers, being as large as 3 eV for ZnIr2O4, which is expected from theoretical predictions. Grown in polycrystalline phase, films of these materials display high conductivity, well above 2 S cm−1.
143 citations
TL;DR: In this article, the vibronic coupling between low-lying electronic states perturbs the observed vibronic levels, and Jahn-Teller transitions are assigned to e vibrational modes of X 2E CH3O.
Abstract: Ultraviolet photoelectron spectra of CH3O−, CH3CH2O−, (CH3)2CHO−, (CH3)3CO−, as well as CD3O− and CD3CD2O− are presented, providing improved electron affinities and new information on vibronic coupling in the corresponding neutral radicals. Jahn-Teller vibronic transitions are assigned to e vibrational modes of X 2E CH3O. The excitation energy of the A 2A′ state of CH3CH2O with respect to the X 2A″ state is observed directly at 355±10 cm−1. Vibronic coupling between these low-lying electronic states perturbs the observed vibronic levels. Features of the (CH3)2CHO− photoelectron spectrum are assigned. The splitting between the X 2A′ and A 2A″ states of (CH3)2CHO is determined to be 1225±65 cm−1. Significant vibronic coupling is not observed in (CH3)2CHO. Vibrational assignments are made for the spectral features of (CH3)3CO and no Jahn-Teller effects are observed directly. Electron affinities (EAs) for the neutrals (RO) are (in eV); EA(CH3O)=1.572±0.004; EA(CD3O)=1.559±0.004; EA(CH3CH2O)=1.712±0.004; EA...
142 citations
TL;DR: In this article, the adsorption of NO, CO and to some extent of O2 on Pt (100) and Ru (1010) surfaces was investigated by Auger electron and UV photoemission spectroscopy (UPS) at substrate temperatures below 100°C.
142 citations