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Control of Ion-Photoelectron Entanglement and Coherence Via Rabi Oscillations.
J Phys Chem A
December 2023
Tohoku University, Sendai 980-8577, Japan.
We report a theoretical investigation of photoionization by a pair of coherent, ultrashort, fundamental and second-harmonic extreme-ultraviolet pulses, where the photon energies are selected to yield the same photoelectron energy for ionization of two different subshells. This choice implies that the fundamental energy is equal to the difference in energy of the ionic states and that they are therefore coupled by the fundamental photon. By deriving analytical expressions using the essential-states approach, we show that this Rabi coupling creates coherence between the two photoelectron wave packets, which would otherwise be incoherent.
View Article and Find Full Text PDFEnergy-dependent timescales in the dissociation of diiodothiophene dication.
Phys Chem Chem Phys
February 2023
MAX IV Laboratory, Lund University, SE-22100 Lund, Sweden.
Photodissociation molecular dynamics of gas-phase 2,5-diiodothiophene molecules was studied in an electron-energy-resolved electron-multi-ion coincidence experiment performed at the FinEstBeAMS beamline of MAX IV synchrotron. Following the photoionization of the iodine 4d subshell and the Auger decay, the dissociation landscape of the molecular dication was investigated as a function of the Auger electron energy. Concentrating on an major dissociation pathway, CHIS → CHS + I + I, and accessing the timescales of the process ion momentum correlation analysis, it was revealed how this three-body process changes depending on the available internal energy.
View Article and Find Full Text PDFPhotoionization of C: Effects of Correlation on Cross Sections and Angular Distributions of Valence Subshells.
J Phys Chem A
January 2020
Dipartimento di Scienze Chimiche e Farmaceutiche , Universita' di Trieste, Via Giorgieri 1 , I-34127 Trieste , Italy.
Calculations of the photoionization cross section and asymmetry parameter, β, are performed at the density functional theory (DFT) and time-dependent density functional theory (TDDFT) levels for all 32 valence levels of C. Accurate numerical results are obtained for the isolated molecule in icosahedral symmetry. A detailed analysis based on the comparison between the DFT and TDDFT results allows the identification of four types of resonances: the well-known confinement resonances of mainly geometrical origin, shape resonances native to the ionization channel, induced shape resonances, and autoionization resonances brought about by interchannel coupling, as well as their different prominence in cross section or asymmetry parameter.
View Article and Find Full Text PDFAttosecond photoemission delays for all the valence (5p, 5p, 5s, 4d, 4d) subshells of xenon have been accessed using the interferometric RABBITT technique. The 4d subshell delays in Xe have been accessed for the first time, to the best of our knowledge, due to the high photon energy used. A novel technique of single-shot referencing in the collinear back-focusing geometry has been introduced.
View Article and Find Full Text PDFMeasurement of partial L fluorescence yields of bismuth using synchrotron radiation.
Appl Radiat Isot
March 2016
CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette Cedex, France.
Article Synopsis
- Researchers used tunable monochromatic photon radiation to analyze how much bismuth absorbs in the 7keV to 20keV energy range.
- They measured the fluorescence from bismuth by combining data from photoionization and X-rays from a radioactive source (210Pb).
- By varying photon energies, they could successively ionize different L subshells, helping them to analyze rearrangement spectra and determine the relative X-ray intensities of the L1, L2, and L3 series.
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