scholarly journals Electronic shells or molecular orbitals: Photoelectron spectra of Ag−n clusters

1995 ◽  
Vol 102 (16) ◽  
pp. 6406-6422 ◽  
Author(s):  
H. Handschuh ◽  
Chia‐Yen Cha ◽  
P. S. Bechthold ◽  
G. Ganteför ◽  
W. Eberhardt
Keyword(s):  
Molecular Orbitals ◽  
Photoelectron Spectra

Assignment of the valence molecular orbitals of cis-[PtR2L2] complexes: UV photoelectron spectra and SCF-MS-X.alpha. calculations

1989 ◽  
Vol 28 (1) ◽  
pp. 1-2 ◽  
Author(s):  
Dong Sheng Yang ◽  
G. Michael Bancroft ◽  
John D. Bozek ◽  
R. J. Puddephatt ◽  
John S. Tse
Keyword(s):  
Molecular Orbitals ◽  
Photoelectron Spectra

A Discussion on photoelectron spectroscopy - Photoelectron studies of boron compounds I. Diborane, borazine and B-trifluoroborazine

1970 ◽  
Vol 268 (1184) ◽  
pp. 97-109 ◽  
Keyword(s):  
Fine Structure ◽  
Photoelectron Spectroscopy ◽  
Molecular Orbitals ◽  
Ionization Potentials ◽  
Photoelectron Spectra ◽  
Energy Separation ◽  
Hydrogen Bridge ◽  
Boron Compounds ◽  
Vertical Ionization Potentials

The photoelectron spectra of diborane, hexadeuterodiborane, borazine and B -trifluoroborazine are presented, and adiabatic and vertical ionization potentials have been measured. The vibrational fine structure observed on some of the diborane bands is shown to be consistent with the forms of the molecular orbitals calculated by rigorous s.c.f. methods. The vertical i.p. of diborane are in better accord with a calculation which predicts a boron-boron bond in addition to the hydrogen bridge than with the calculations which indicate no direct boron-boron interaction. In borazine it is shown that the uppermost orbital is of π type rather than the σ type predicted by calculations, and that the extent of the π bonding, as measured by the energy separation of the π-type orbitals, is about 85 % of that in benzene. The effect of fluorination of borazine, as in benzene, is to stabilize the σ orbitals more than the π orbitals.

Photoelectron spectra and valence shell orbital structures of groups V and VI hydrides

1972 ◽  
Vol 326 (1565) ◽  
pp. 181-197 ◽  
Keyword(s):  
Vibrational Structure ◽  
Molecular Orbitals ◽  
Ionization Potentials ◽  
Photoelectron Spectra ◽  
Valence Shell ◽  
Group V ◽  
Bond Angles ◽  
Vertical Ionization Potentials

Photoelectron spectra are reported for the hydrides of group v and vi elements. Vibrational structure has been observed in bands associated with all but the inner-most valence orbitals. It has been used to obtain changes in bond angles or bond distances which result from the ionization of successive molecular orbitals. Ionization from the inner (la 1 ) orbitals of the hydrides has been observed using He II 304 Å+ radiation. From these data vertical ionization potentials have been derived for all the valence orbitals of the hydrides XH, XH 2 , XH 3 and XH 4 for which the corresponding united atoms are Ne, A, Kr and Xe. Graphs of these values are used to show the effects of inner shells on the valence orbitals.

Assignment of the valence molecular orbitals of (cyclopentadienyl)trimethylplatinum and (cyclooctadiene)dimethylplatinum using variable-energy photoelectron spectra

1990 ◽  
Vol 29 (24) ◽  
pp. 4956-4960 ◽  
Author(s):  
D. S. Yang ◽  
G. M. Bancroft ◽  
R. J. Puddephatt ◽  
K. H. Tan ◽  
J. N. Cutler ◽  
...  
Keyword(s):  
Molecular Orbitals ◽  
Photoelectron Spectra ◽  
Variable Energy

Photoelectron spectra of halogenated ethylenes

1970 ◽  
Vol 315 (1522) ◽  
pp. 323-338 ◽  
Keyword(s):  
Bond Length ◽  
Vibrational Structure ◽  
Molecular Orbitals ◽  
Ionization Potentials ◽  
Photoelectron Spectra ◽  
Electronic Transitions ◽  
Parent Molecule ◽  
Atomic Orbitals

Photoelectron spectra of chloro-, fluoro- and chlorofluoroethylenes have been measured. Ionization potentials in the range 6 to 21 eV have been determined, and vibrational structure associated with many of the electronic transitions has been interpreted in terms of vibrations of the ion and correlated with those of the parent molecule. The various ionization potentials have been associated with specific orbitals such as the C=C π orbital, and molecular orbitals derived from the p atomic orbitals of halogens. Variations in these ionization potentials have been discussed in relation to inductive and conjugative effects of the halogen substituents. Some observed differences between the spectra of the chloro- and fluoroethylenes have been considered in relation to possible mechanisms of the changes in bond length consequent upon ionization.

The He(I) photoelectron spectra of the propenoyl halides

1987 ◽  
Vol 65 (4) ◽  
pp. 683-686 ◽  
Author(s):  
Dieter Klapstein ◽  
Robert T. O'Brien
Keyword(s):  
Related Species ◽  
Molecular Orbitals ◽  
Photoelectron Spectra ◽  
Mo Calculations ◽  
Sum Rule ◽  
Orbital Energies ◽  
Out Of Plane ◽  
Semi Empirical

The He(I) photoelectron spectra of propenal and the propenoyl halides, CH2=CHCOX, X = H, F, Cl, Br, were measured and interpreted with the aid of semi-empirical MO calculations, comparison with results for structurally related species, and a sum-rule for the out-of-plane orbital energies. Information concerning the identities and relative energies of the higher occupied molecular orbitals of the neutral molecules could be deduced from the spectra.

scholarly journals X-ray photoelectron spectra structure and chemical bonding in AmO2

2015 ◽  
Vol 30 (2) ◽  
pp. 83-98 ◽  
Author(s):  
Yury Teterin ◽  
Konstantin Maslakov ◽  
Mikhail Ryzhkov ◽  
Anton Teterin ◽  
Kirill Ivanov ◽  
...  
Keyword(s):  
Binding Energy ◽  
Energy Range ◽  
Chemical Bond ◽  
Theoretical Data ◽  
Molecular Orbitals ◽  
Binding Energies ◽  
Photoelectron Spectra ◽  
Spectral Structure ◽  
Discrete Variation ◽  
X Ray

Quantitative analysis was done of the X-ray photoelectron spectra structure in the binding energy range of 0 eV to ~35 eV for americium dioxide (AmO2) valence electrons. The binding energies and structure of the core electronic shells (~35 eV-1250 eV), as well as the relativistic discrete variation calculation results for the Am63O216 and AmO8 (D4h) cluster reflecting Am close environment in AmO2 were taken into account. The experimental data show that the many-body effects and the multiplet splitting contribute to the spectral structure much less than the effects of formation of the outer (0-~15 eV binding energy) and the inner (~15 eV-~35 eV binding energy) valence molecular orbitals. The filled Am 5f electronic states were shown to form in the AmO2 valence band. The Am 6p electrons participate in formation of both the inner and the outer valence molecular orbitals (bands). The filled Am 6p3/2 and the O 2s electronic shells were found to make the largest contributions to the formation of the inner valence molecular orbitals. Contributions of electrons from different molecular orbitals to the chemical bond in the AmO8 cluster were evaluated. Composition and sequence order of molecular orbitals in the binding energy range 0-~35 eV in AmO2 were established. The experimental and theoretical data allowed a quantitative scheme of molecular orbitals for AmO2, which is fundamental for both understanding the chemical bond nature in americium dioxide and the interpretation of other X-ray spectra of AmO2.

A Photoelectron Investigation of the Peroxide Bond

1975 ◽  
Vol 53 (22) ◽  
pp. 3439-3447 ◽  
Author(s):  
R. S. Brown
Keyword(s):  
Dihedral Angle ◽  
Ground State ◽  
Vibrational Frequencies ◽  
Molecular Orbitals ◽  
Photoelectron Spectra ◽  
Raman Spectroscopic ◽  
Orbital Interactions ◽  
Highest Occupied Molecular Orbitals ◽  
Peroxide Bond

The photoelectron spectra of several peroxides and their interpretation is presented. The effects of substituents is separated from vicinal orbital interactions using as a guideline the effect of similar substitution on the ether analogues. It is found that by comparison of Raman spectroscopic frequencies of the peroxide ground state, and vibrational frequencies for the ion (via pes), that the HOMO of peroxides is antibonding with respect to the O—O linkage. Additionally, the dependence of the splitting of the two highest occupied molecular orbitals on dihedral angle is verified by the pe spectra of several well-defined cyclic peroxides. Finally, the pe spectrum of tetramethyl-1,2-dioxacyclobutane (tetramethyl dioxetane) is presented indicating that it is not unlike other cyclic peroxides.

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