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Imaging Photoelectron Circular Dichroism in the Detachment of Mass-Selected Chiral Anions.
Angew Chem Int Ed Engl
January 2023
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany.
Photoelectron Circular Dichroism (PECD) is a forward-backward asymmetry in the photoemission from a non-racemic sample induced by circularly polarized light. PECD spectroscopy has potential analytical advantages for chiral discrimination over other chiroptical methods due to its increased sensitivity to the chiral potential of the molecule. The use of anions for PECD spectroscopy allows for mass-selectivity and provides a path to simple experimental schemes that employ table-top light sources.
View Article and Find Full Text PDFAtomic Undercoordination in Ag Islands on Ru(0001) Grown via Size-Selected Cluster Deposition: An Experimental and Theoretical High-Resolution Core-Level Photoemission Study.
J Phys Chem C Nanomater Interfaces
May 2021
Department of Physics, University of Trieste, Via Valerio 2, 34127 Trieste, Italy.
The possibility of depositing precisely mass-selected Ag clusters (Ag, Ag, and Ag) on Ru(0001) was instrumental in determining the importance of the in-plane coordination number (CN) and allowed us to establish a linear dependence of the Ag 3d core-level shift on CN. The fast cluster surface diffusion at room temperature, caused by the low interaction between silver and ruthenium, leads to the formation of islands with a low degree of ordering, as evidenced by the high density of low-coordinated atomic configurations, in particular CN = 4 and 5. On the contrary, islands formed upon Ag deposition show a higher density of atoms with CN = 6, thus indicating the formation of islands with a close-packed atomic arrangement.
View Article and Find Full Text PDFIntrinsic electrophilic properties of nucleosides: photoelectron spectroscopy of their parent anions.
J Chem Phys
August 2007
Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA.
The nucleoside parent anions 2(')-deoxythymidine(-), 2(')-deoxycytidine(-), 2(')-deoxyadenosine(-), uridine(-), cytidine(-), adenosine(-), and guanosine(-) were generated in a novel source, employing a combination of infrared desorption, electron photoemission, and a gas jet expansion. Once mass selected, the anion photoelectron spectrum of each of these was recorded. In the three cases in which comparisons were possible, the vertical detachment energies and likely adiabatic electron affinities extracted from these spectra agreed well with the values calculated both by Richardson et al.
View Article and Find Full Text PDFPhotoemission studies of polythiophene and polyphenyl films produced via surface polymerization by ion-assisted deposition.
J Phys Chem B
April 2005
Department of Chemistry (m/c 111), University of Illinois at Chicago, Chicago, Illinois 60607-7061, USA.
Conducting polymer films are grown by mass-selected, hyperthermal thiophene ions coincident on a surface with a thermal beam of organic monomers of either alpha-terthiophene (3T) or p-terphenyl (3P) neutrals. Mass spectrometry and X-ray photoelectron spectroscopy previously verified polymerization of both 3T and 3P by 200 eV C(4)H(4)S(+) during surface polymerization by ion-assisted deposition (SPIAD). The electronic structure of these films are probed here by ultraviolet photoelectron spectroscopy (UPS) and polarized near-edge X-ray absorption fine structure spectroscopy (NEXAFS) and compared with similar spectra of evaporated films.
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