scholarly journals Determination of the structure and geometry of N-heterocyclic carbenes on Au(111) using high-resolution spectroscopy

2019 ◽  
Vol 10 (3) ◽  
pp. 930-935 ◽  
Author(s):  
Giacomo Lovat ◽  
Evan A. Doud ◽  
Deyu Lu ◽  
Gregor Kladnik ◽  
Michael S. Inkpen ◽  
...  
Keyword(s):  
High Resolution ◽  
Metal Surfaces ◽  
Heterocyclic Carbenes ◽  
High Resolution Spectroscopy

The geometry and bonding of N-heterocyclic carbenes to metal surfaces depends on the substituents on the N-atoms.

High-Resolution Spectroscopy Using an Acousto-Optic Tunable Filter and a Fiber-Optic Fabry-Perot Interferometer

1996 ◽  
Vol 50 (4) ◽  
pp. 498-503 ◽  
Author(s):  
David P. Baldwin ◽  
Daniel S. Zamzow ◽  
Arthur P. D'Silva
Keyword(s):  
High Resolution ◽  
Inductively Coupled Plasma ◽  
Fiber Optic ◽  
Focal Length ◽  
Atomic Emission ◽  
Tunable Filter ◽  
High Resolution Spectroscopy ◽  
Uranium Isotopes ◽  
Fabry Perot

A compact, solid-state, high-resolution spectrometer consisting of an acousto-optic tunable filter (AOTF) and a fiber-optic Fabry-Perot (FFP) interferometer has been developed. The system has been designed for high-resolution inductively coupled plasma atomic emission spectroscopy (ICP-AES) applications. A description of the AOTF-FFP and its performance is presented. The resolution of the AOTF-FFP was determined by measuring the physical widths of ICP emission lines using a 1.5-m-focal-length grating spectrometer and deconvoluting the physical line shapes from the acquired AOTF-FFP spectra. Over the optimum range of the FFP mirror coatings, the resolution is sufficient for the determination of isotopic and hyperfine emission features in ICP-AES experiments, and approaches that of the 1.5-m spectrometer. The application of the AOTF-FFP to the determination of uranium isotopes (U-235 and U-238) introduced into the ICP is presented.

Analysis of Compounds of Biological Interest by Electron Spectroscopy

1970 ◽  
Vol 16 (8) ◽  
pp. 677-680 ◽  
Author(s):  
L D Hulett ◽  
T A Carison
Keyword(s):  
Quantitative Analysis ◽  
High Resolution ◽  
Electron Spectroscopy ◽  
Binding Energies ◽  
High Resolution Spectroscopy ◽  
Biological Research ◽  
X Rays ◽  
Amine Group ◽  
Biological Interest

Abstract Electron spectroscopy involves measuring the energies of electrons ejected when matter is irradiated with photons. One of the more powerful applications of electron spectroscopy is the determination of the binding energies of the inner shells of atoms with soft X-rays. The binding energies of the inner shells are characteristic of the element; thus, a means of qualitative analysis is provided. Quantitative analysis can be done also. In addition, use of high-resolution spectroscopy enables one to determine the oxidation state of each atom, because the binding energies will shift with chemical environment. For example, the K shell binding energy in nitrogen is about 10 V lower for an amine group than for a nitro group. This analysis can be used for all elements with atomic numbers higher than lithium. The advantages of electron spectroscopy for biological research, both for fundamental and in chemical applications, are discussed in general. Recent studies on t-RNA and its bases are given as specific examples of the applicability of the method.

High Resolution Spectroscopy of the Hydrogen Atom: Determination of the1SLamb Shift

1996 ◽  
Vol 76 (3) ◽  
pp. 384-387 ◽  
Author(s):  
S. Bourzeix ◽  
B. de Beauvoir ◽  
F. Nez ◽  
M. D. Plimmer ◽  
F. de Tomasi ◽  
...  
Keyword(s):  
High Resolution ◽  
Hydrogen Atom ◽  
High Resolution Spectroscopy

scholarly journals Determination of intrinsic effective fields and microwave polarizations by high-resolution spectroscopy of single nitrogen-vacancy center spins

2019 ◽  
Vol 21 (11) ◽  
pp. 113039
Author(s):  
J Kölbl ◽  
M Kasperczyk ◽  
B Bürgler ◽  
A Barfuss ◽  
P Maletinsky
Keyword(s):  
High Resolution ◽  
Nitrogen Vacancy ◽  
High Resolution Spectroscopy ◽  
Nitrogen Vacancy Center ◽  
Vacancy Center

scholarly journals Data Reduction Induced Errors in the Asteroseismology of Early-Type Stars

2009 ◽  
Vol 5 (H15) ◽  
pp. 358-358
Author(s):  
Petr Škoda
Keyword(s):  
High Resolution ◽  
Data Reduction ◽  
Chemical Elements ◽  
Systematic Errors ◽  
High Resolution Spectroscopy ◽  
Line Profiles ◽  
Early Type ◽  
Early Type Stars

In the asteroseismology of early type stars it plays an important role the extremely precise high resolution spectroscopy. Especially the determination of pulsation modes from observations requires the identification of subtle changes in line profiles of a number of chemical elements. As commonly available instruments suitable for this purpose are echelle spectrographs, there is a number of possible imperfections and even systematic errors introduced by the echelle reduction procedures. We will mention several, most critical steps, that should be carefully checked during every reduction.

scholarly journals How well can we determine ages and chemical abundances from spectral fitting of integrated light spectra?

2020 ◽  
Vol 499 (2) ◽  
pp. 2327-2339
Author(s):  
Geraldo Gonçalves ◽  
Paula Coelho ◽  
Ricardo Schiavon ◽  
Christopher Usher
Keyword(s):  
High Resolution ◽  
Wavelength Range ◽  
Globular Clusters ◽  
Stellar Population ◽  
High Resolution Spectroscopy ◽  
Chemical Abundances ◽  
Spectral Fitting ◽  
Light Spectra ◽  
The Ideal

ABSTRACT The pixel-to-pixel spectral fitting technique is often used in studies of stellar populations. It enables the user to infer several parameters from integrated light spectra such as ages and chemical abundances. In this paper, we examine the question of how the inferred parameters change with the choice of wavelength range used. We have employed two different libraries of integrated light spectra of globular clusters (GCs) from the literature and fitted them to stellar population models using the code Starlight. We performed tests using different regions of the spectra to infer reddening, ages, [Fe/H], and [α/Fe]. Comparing our results to age values obtained from isochrone fitting and chemical abundances from high-resolution spectroscopy, we find that: (1) the inferred parameters change with the wavelength range used; (2) the method in general retrieves good reddening estimates, specially when a wider wavelength range is fitted; (3) the ideal spectral regions for determination of age, [Fe/H], and [α/Fe] are 4170–5540, 5280–7020, and 4828–5364 Å, respectively; (4) the retrieved age values for old metal-poor objects can be several Gyr younger than those resulting from isochrone fitting. We conclude that, depending on the parameter of interest and the accuracy requirements, fitting the largest possible wavelength range may not necessarily be the best strategy.

High resolution spectroscopy and potential determination of the (3)Π1 state of NaCs

2006 ◽  
Vol 124 (17) ◽  
pp. 174310 ◽  
Author(s):  
O. Docenko ◽  
M. Tamanis ◽  
J. Zaharova ◽  
R. Ferber ◽  
A. Pashov ◽  
...  
Keyword(s):  
High Resolution ◽  
High Resolution Spectroscopy

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

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