The vacuum-ultraviolet spectrum of iron pentacarbonyl: An experimental analysis supported by a CASSCF CCI study of the Rydberg states

1992 ◽  
Vol 96 (1) ◽  
pp. 121-123 ◽  
Author(s):  
Antonio Marquez ◽  
Chantal Daniel ◽  
Javier Fernandez Sanz
Keyword(s):  
Experimental Analysis ◽  
Vacuum Ultraviolet ◽  
Rydberg States ◽  
Iron Pentacarbonyl ◽  
Ultraviolet Spectrum

The vacuum ultraviolet spectrum of the bromine molecule

1969 ◽  
Vol 47 (22) ◽  
pp. 2525-2538 ◽  
Author(s):  
Putcha Venkateswarlu
Keyword(s):  
Absorption Spectrum ◽  
Ionization Potential ◽  
Ground State ◽  
Vacuum Ultraviolet ◽  
Band System ◽  
Rydberg States ◽  
Ultraviolet Spectrum ◽  
Similar Series ◽  
Ionization Limit ◽  
Rydberg Transitions

The absorption spectrum of bromine has been photographed in the first and higher orders of a 10.7-m. concave vacuum grating spectrograph in the region 1700–1170 Å.A number of band systems have been obtained in the region 1510–1170 Å, most of which correspond to Rydberg transitions. In addition, an extensive band system with closely-spaced bands degraded to longer wavelengths has been recorded in the region 1700–1500 Å. Among the Rydberg systems, five series have been found to converge to 85 165 ± 80 cm−1 which represents the ionization potential of the molecule leading to the 2Π3/2g state of the molecular ion. They arise due to transitions from the ground state to [σg2πu4πg32Π3/2g]npσu, [σg2πu4πg32Π3/2g]npπu, [σg2πu4πg32Π3/2g]nfσu, [σg2πu4πg32Π3/2g]nfπu, and [σg2πu4πg32Π3/2g]nfδu configurations where n takes the running values 5, 6, 7, … etc. The first few members of four similar series corresponding to the transitions to the states involving the [σg2πu4πg32Π1/2g] core have been identified and the ionization limit of these series is estimated to be at 88 306 ± 80 cm−1. Two of the remaining band systems have been found to be very likely due to transitions to the Rydberg states with the configurations [σg2πu3πg42Π3/2u]5sσg and [σg2πu3πg42Π1/2u]5sσg, respectively. Three of the observed systems which do not involve Rydberg states appear to have for their upper levels the 1Πu(1u), 3Π(1u), and 3Π(0u+) states arising from the configuration σgπu3πg4σu2.

Assignment of the vacuum-ultraviolet spectrum of ethylene sulphide

1993 ◽  
Vol 212 (6) ◽  
pp. 654-658 ◽  
Author(s):  
M. Carnell ◽  
S.D. Peyerimhoff
Keyword(s):  
Vacuum Ultraviolet ◽  
Ultraviolet Spectrum

scholarly journals The vacuum ultraviolet spectrum of cyclohepta-1, 3, 5-triene: Analysis of the singlet and triplet excited states by ab initio and density functional methods

2020 ◽  
Vol 153 (5) ◽  
pp. 054301
Author(s):  
Michael H. Palmer ◽  
Søren Vrønning Hoffmann ◽  
Nykola C. Jones ◽  
Marcello Coreno ◽  
Monica de Simone ◽  
...  
Keyword(s):  
Ab Initio ◽  
Excited States ◽  
Density Functional ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Spectrum ◽  
Density Functional Methods ◽  
Functional Methods ◽  
Triplet Excited States

ABSORPTION SPECTRA OF ETHYLENE AND ETHYLENE-d4 IN THE VACUUM ULTRAVIOLET. II

1956 ◽  
Vol 34 (7) ◽  
pp. 643-652 ◽  
Author(s):  
P. G. Wilkinson
Keyword(s):  
Absorption Spectra ◽  
Vacuum Ultraviolet ◽  
Stable Equilibrium ◽  
Equilibrium Configuration ◽  
Rydberg States ◽  
Torsional Oscillator ◽  
Potential Barriers ◽  
First Order ◽  
Stretching Vibration ◽  
Vibrational Constants

The absorption spectra of ethylene and ethylene-d4 have been investigated in the 1300 Å to 1500 Å region using the first order of a 21-ft. vacuum grating spectrograph. Vibrational constants for the v2(ag) stretching vibration and the v4(au) twisting vibration have been determined for each of the observed five Rydberg states. The torsional oscillator–rotator treatment has been applied to the observed twisting data, and potential barriers hindering free rotation of 500 to 1200 cm−1 were obtained. It is concluded that the stable equilibrium configuration of the Rydberg states is not of D2h symmetry but is probably bent or staggered.

Absorption spectrum of the NO molecule. VIII. The heterogeneous (2Σ–2Π) interactions between excited states

1968 ◽  
Vol 46 (8) ◽  
pp. 987-1003 ◽  
Author(s):  
Ch. Jungen ◽  
E. Miescher
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Excited States ◽  
Rydberg State ◽  
Vacuum Ultraviolet ◽  
Principal Quantum Number ◽  
Rydberg States ◽  
Infrared Emission ◽  
Strong Interactions ◽  
Rydberg Series

Heterogeneous perturbations 2E+ ~ 2Π of largely different magnitudes are observed with high resolution in the vacuum-ultraviolet absorption and in the infrared emission spectrum of the NO molecule. The rotational interactions between 2Σ+ Rydberg states and levels of the B2Π non-Rydberg state are shown to be "configurationally forbidden", but produced by the configuration interaction between the non-Rydberg levels and 2Π Rydberg states. The latter together with the 2Σ+ Rydberg states form p complexes. In this way the interactions display the l uncoupling in the complexes; they can be evaluated theoretically and can be analyzed fully. The cases of the strong interactions D2Σ+(v = 3) ~ B2Π(v = 16)and D2Σ+(v = 5) ~ B2Π(v = 21) and of the weaker D2Σ+(v = 1) ~ B2Π(v = 11), all three observed as perturbations in ε bands crossing 3 bands, are discussed in detail. It is further shown that perturbations between γ bands and β bands as well as perturbations between analogous bands of higher principal quantum number are absent, and thus the assignment of the A2Σ+ and E2Σ+ states to the s Rydberg series is confirmed.

The vacuum ultraviolet spectrum of [Mn2(CO)10]

1992 ◽  
Vol 434 (2) ◽  
pp. 235-240 ◽  
Author(s):  
Antonio Márquez ◽  
Javier Fernández Sanz ◽  
Michel Gelizé ◽  
Alain Dargelos
Keyword(s):  
Vacuum Ultraviolet ◽  
Ultraviolet Spectrum

A Discussion on astronomy in the ultraviolet - A study of interstellar lines in the rocket spectrum of δ Scorpii

1975 ◽  
Vol 279 (1289) ◽  
pp. 317-322
Keyword(s):  
Ground State ◽  
Atomic Hydrogen ◽  
Vacuum Ultraviolet ◽  
Velocity Dispersion ◽  
Ultraviolet Spectrum ◽  
Ultraviolet A ◽  
Average Ratio ◽  
Solar Abundances ◽  
Fe Ions ◽  
Cloud Density

An analysis is made of ten interstellar lines in the vacuum ultraviolet spectrum of 8 Sco. The data were taken from a rocket spectrogram with wavelength coverage extending from 1177 to 1717 A with a resolution of approximately 0.15 A. Column densities of C°, C+, N°, 0°, A1+, Si+ and Fe+ are derived, from which abundances relative to atomic hydrogen are determined. Compared to corresponding solar abundances, silicon and iron are slightly overabundant whereas the remaining species are underabundant by factors of 1.8 to 8.6. It is shown that the relative Fe abundance may be made significantly less than the solar value by arbitrarily increasing the velocity dispersion of the Fe+ ions by a factor of 2. The relative populations of the carbon atoms ground state fine structure levels combined with two possible mean cloud temperatures of 47 and 76 K determined from the interstellar H 2 spectrum yield a mean cloud density of 250 and 150 cm-3 respectively. Using the appropriate column densities of neutral and singly ionized carbon atoms, the average ratio of the electron density at the hydrogen atom density for each temperature is found to be 2.1 x 10-4 and 4.8 x 10~2 *4 respectively.

Vacuum ultraviolet spectrum and quantum yield of the 193 nm photolysis of phosgene

1996 ◽  
Vol 263 (6) ◽  
pp. 817-821 ◽  
Author(s):  
Martin Jäger ◽  
Horst Heydtmann ◽  
Cornelius Zetzsch
Keyword(s):  
Quantum Yield ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Spectrum ◽  
193 Nm
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