Inexpensive and high-precision digital power supply and counting interface for UPS, XPS, and Auger spectrometers

Lichtenberger, Dennis L.; Kellogg, Glen E.; Kristofzski, J.G.; Page, Dennis G.; Turner, S. E.; Klinger, Gerry; Lorenzen, J.

doi:10.1063/1.1139199

Cited by 57 publications

(58 citation statements)

References 2 publications

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“…28 The electron detection and instrument operation are interfaced to a National Instruments PCIe-6259 multi-function data acquisition card and custom software. During data collection the instrument resolution (measured using fwhm of the argon 2 P 3/2 peak) was 0.020-0.030 eV.…”

Section: Photoelectron Spectroscopymentioning

confidence: 99%

Photoelectron Spectroscopy and Electronic Structure Calculations of d¹ Vanadocene Compounds with Chelated Dithiolate Ligands: Implications for Pyranopterin Mo/W Enzymes

et al. 2007

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Section: Photoelectron Spectroscopymentioning

confidence: 99%

Photoelectron Spectroscopy and Electronic Structure Calculations of d¹ Vanadocene Compounds with Chelated Dithiolate Ligands: Implications for Pyranopterin Mo/W Enzymes

et al. 2007

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“…The He I gas-phase photoelectron spectra were recorded using an instrument that features a 36 cm radius, 8 cm gap hemispherical analyzer (McPherson) and custom-designed excitation source, sample cells, and detection and control electronics; these have been described in more detail previously (Lichtenberger et al 1986). The samples sublimed cleanly at the following temperatures (10 K4 torr, temperatures monitored using a 'K'-type thermocouple passed via a vacuum feed-through and attached directly to the sample cell) with no evidence of decomposition products in the gas phase or as a solid residue for any of the samples: T 3 , 78-908C; T 4 , 158-1758C; T 6 , 250-2758C; and T 8 , 365-4258C.…”

Section: Methodsmentioning

confidence: 99%

Hole-vibronic coupling in oligothiophenes: impact of backbone torsional flexibility on relaxation energies

Filho

Coropceanu

Fichou

et al. 2007

Phil. Trans. R. Soc. A.

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Density functional theory calculations together with highly resolved gas-phase ultraviolet photoelectron spectroscopy have been applied to oligothiophene chains with up to eight thiophene rings. One of the important parameters governing the charge transport properties in the condensed phase is the amount of energy relaxation upon ionization. Here, we investigate the impact on this parameter of the backbone flexibility present in oligothiophenes as a result of inter-ring torsional motions. With respect to oligoacenes that are characterized by a coplanar and rigid backbone, the torsional flexibility in oligothiophenes adds to the relaxation energy and leads to the broadening of the first ionization peak, making its analysis more complex.

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“…Development of mini and microcomputers enables much more precise control of the analyzer focusing voltages and electron counting electronics. (13) The most important developments, however, have been in the areas of ultra-high vacuum (UHV) and clean sample handling/preparation in the UHV environment. These developments have made possible many experiments for investigating surfaces that were impossible a decade ago.…”

Section: The Experimentsmentioning

confidence: 99%

Photoelectron Spectroscopy

Lichtenberger

Kellogg

Pang

1987

ACS Symposium Series

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The basic approach, instrumentation, sample require ments, and principles of interpretation for the photoelectron spectroscopy of organometallic molecules are briefly described. The ionization information is directly related to the formal oxidation states and d electron counts of the metals, the actual effective metal charges and charge potentials, the electronic symmetry around the metal centers, and the individual σ, π, etc. bonding capabilities of ligands and metal fragments. This technique contributes to a level of experimental characterization of organometallic mole cules, beyond the usual three-dimensional structure description, that is essential for interpretation of many physical and chemical properties. Application of the technique is illustrated with examples in which the individual bonding capabilities of several different ligands with a common metal fragment are compared, and in which the bonding of different metal fragments with a common ligand are compared.The present level of understanding of organometallic chemistry and catalysis is rooted in the detail and breadth of characterization that is possible for organometallic molecules. An important key to this knowledge is provided by characterization of the structural arrangement of atoms in the molecule by crystal structure determina tions or other techniques. However, the understanding of the proper ties and behavior of a molecule, and the ability to extend this understanding to new systems, requires knowledge of more than just the particular three-dimensional arrangement of atoms. A further, taore detailed step in characterization of a molecule is to obtain information on the electronic structure in terms of electron dis tributions, bonding, and stability. The characters of the bonds, lone pairs, regions of charge build-up and depletion, local dipoles, electronic perturbation effects, etc. define the physical and dynamic properties of the molecule and its reactions with its environment. Full characterization of a molecule must include its electronic structural features in addition to the molecular structure. The principles and models of organometallic bonding are some of the most 1 Current address:

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Inexpensive and high-precision digital power supply and counting interface for UPS, XPS, and Auger spectrometers

Abstract: A digital data-acquisition system has been built to interface two photoelectron spectrometers to a DEC LSI-11/23 processor.

Cited by 57 publications

References 2 publications

Photoelectron Spectroscopy and Electronic Structure Calculations of d¹ Vanadocene Compounds with Chelated Dithiolate Ligands: Implications for Pyranopterin Mo/W Enzymes

Photoelectron Spectroscopy and Electronic Structure Calculations of d¹ Vanadocene Compounds with Chelated Dithiolate Ligands: Implications for Pyranopterin Mo/W Enzymes

Hole-vibronic coupling in oligothiophenes: impact of backbone torsional flexibility on relaxation energies

Photoelectron Spectroscopy

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Inexpensive and high-precision digital power supply and counting interface for UPS, XPS, and Auger spectrometers

Abstract: A digital data-acquisition system has been built to interface two photoelectron spectrometers to a DEC LSI-11/23 processor.

Cited by 57 publications

References 2 publications

Photoelectron Spectroscopy and Electronic Structure Calculations of d1 Vanadocene Compounds with Chelated Dithiolate Ligands: Implications for Pyranopterin Mo/W Enzymes

Photoelectron Spectroscopy and Electronic Structure Calculations of d1 Vanadocene Compounds with Chelated Dithiolate Ligands: Implications for Pyranopterin Mo/W Enzymes

Hole-vibronic coupling in oligothiophenes: impact of backbone torsional flexibility on relaxation energies

Photoelectron Spectroscopy

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Product

Resources

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Photoelectron Spectroscopy and Electronic Structure Calculations of d¹ Vanadocene Compounds with Chelated Dithiolate Ligands: Implications for Pyranopterin Mo/W Enzymes

Photoelectron Spectroscopy and Electronic Structure Calculations of d¹ Vanadocene Compounds with Chelated Dithiolate Ligands: Implications for Pyranopterin Mo/W Enzymes