Analyses of the 5d2–5d7p transitions in the Ta IV and W V spectra

1996 ◽  
Vol 74 (3-4) ◽  
pp. 145-149 ◽  
Author(s):  
S. S. Churilov ◽  
R. R. Kildiyarova ◽  
Y. N. Joshi
Keyword(s):  
Light Source ◽  
Configuration Interaction ◽  
Normal Incidence ◽  
Ionization Potentials ◽  
And Tungsten

The spectra of tantalum and tungsten were photographed on a 3 m normal incidence spectrograph using a sliding spark and a triggered spark light source. The 5d2–5d7p transitions in the Ta IV and W V were investigated. All 12 levels of the 5d7p configuration in both Ta IV and W V have been established. The 5d7p and 5d5f configuration interaction has helped us to identify three of the four missing levels of the 5d5f configuration in Ta IV and one missing level in W V Sixty-six lines in Ta IV and 45 lines in W V have been additionally classified. Parametric calculations interpret the observed spectra satisfactorily. Ionization potentials of Ta IV and WV have been estimated to be Ta V2D3/2 = 294 700 ± 1500 cm−1 (36.53 ± 0.18 eV) and W VI 2D3/2 = 421 300 ± 800 cm−1 (52.22 ± 0.10 eV), respectively.

scholarly journals The zeeman effect for the spectrum of tantalum

1928 ◽  
Vol 120 (786) ◽  
pp. 502-510 ◽  
Keyword(s):  
Light Source ◽  
Atomic Number ◽  
Zeeman Effect ◽  
Second Order ◽  
Vacuum Arc ◽  
Du Bois ◽  
And Tungsten

Among the elements whose arc spectrum has not as yet been analysed, one of some interest in Tantalum. Of atomic number 73, it occurs between Hafnium and Tungsten in the atomic table, and according to Bohr it is a homologue of Uranium X. As one of the most powerful methods we have available for investigating the structure of a spectrum is a study of the Zeeman effect shown by its constituent wave-lengths, we decided to use it with tantalum. The magnetically resolved components of over 50 of the more important wave-lengths of its arc spectrum were determined, and the results, together with an account of the investigation, are given in what follows. Apparatus . The light source used consisted of a modified form of vacuum arc and the arc chamber formed an integral part of an electro-magnet, which was of the Du Bois type. The grating, a 4-inch concave one with 15,000 lines per inch, had a radius of 3 meters and was used with an Eagle mounting. The photographs taken were those of second order spectra.

The electronic structures, geometries, and relative energies of some N2H2 and N2H2+ systems

1977 ◽  
Vol 55 (2) ◽  
pp. 350-354 ◽  
Author(s):  
N. Colin Baird ◽  
David A. Wernette
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Configuration Interaction ◽  
Electronic Structures ◽  
Ground States ◽  
Heat Of Formation ◽  
Ionization Potentials ◽  
Basis Set ◽  
Relative Stabilities ◽  
Positive Ions

Ab initio calculations using the 4-31G basis set and extensive configuration interaction are reported for the 1Ag state of trans-diimide (1), the 3A″ and 1A1 states of 1,1-dihydrodiazine (2), and the ground states of the positive ions of these systems and of cis-diimide. In all cases the geometries have been optimized. The relative stabilities of these systems are discussed, with particular reference to the heat of formation of trans-1 and to the ionization potentials of 1 and 2.

The U125 insertion device beamline at the Metrology Light Source

2019 ◽  
Vol 26 (2) ◽  
pp. 535-542 ◽  
Author(s):  
Alexander Gottwald ◽  
Hendrik Kaser ◽  
Michael Kolbe
Keyword(s):  
Light Source ◽  
Photoelectron Spectroscopy ◽  
Near Infrared ◽  
Normal Incidence ◽  
Grazing Incidence ◽  
Uncertainty Budget ◽  
Photon Flux ◽  
Insertion Device ◽  
Grating Monochromator

At the Metrology Light Source, an electron storage ring dedicated to metrological applications, the U125 insertion device beamline utilizes undulator radiation for various applications over a broad spectral range. Using a hybrid normal-incidence and grazing-incidence in-vacuum switchable plane-grating monochromator, a spectral region ranging from the near-infrared to soft X-ray is covered. The beamline is dedicated to surface-analytical methods, e.g. ellipsometry, photoelectron spectroscopy or photoemission tomography. The traceability of radiometric quantities, i.e. quantitative determination of the available radiant power (or photon flux), is required for some of these applications to support the metrological aspect of the measurements. In particular, attention is paid to the suppression of unwanted spectral contributions from higher diffraction orders, and to the monitoring of the radiation intensity during the measurements. With the results from the beamline commissioning, an uncertainty budget for all relevant radiometric quantities was established.

Die Bestimmung der Dissoziationsenergie des F2-Moleküls und ein Beitrag zu seinem Bandenspektrum

1968 ◽  
Vol 23 (4) ◽  
pp. 486-491 ◽  
Author(s):  
W. Stricker ◽  
L. Krauss
Keyword(s):  
Absorption Band ◽  
Light Source ◽  
Dissociation Energy ◽  
Emission Band ◽  
Vacuum Ultraviolet ◽  
Visible Region ◽  
Normal Incidence ◽  
Band Spectrum ◽  
Pumping System ◽  
Differential Pumping

The absorption band spectrum of fluorine has been observed in the extreme vacuum ultraviolet using the Hopfield continuum as light source. The spectrum was photographied by means of a 3 m Hilger normal incidence spectrograph fitted with a differential pumping system. From a rapidly converging v′-progression of bands at 877-857 Å the dissociation energy of the F2-molecule in the groundstate has been established as (1.44 ± 0.07) eV. In connection with the emission band spectrum of F2 in the visible it has been possible to determine the states of the participating transitions in the ultraviolet as well as in the visible region.

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