Photoelectron spectra of some fluorine substituted diazanaphthalenes

The high resolution He 584 Å photoelectron spectra of fluorine substituted 1,2-diaza-, 1,3-diaza-, 1,4-diaza- and 2,3-diaza-naphthalene are presented. By means of fluorine substitution the analysis of the photoelectron spectra of the parent compounds can be made more definite. Unexpected shifts of the nitrogen “lone-pair” bands can be explained within the through-space and through-bond interaction model. From this explanation one can deduce that fluorine substitution can give experimental evidence about the symmetry character of the “lone-pair” molecular orbitals.     

Infrared spectra of some organotitanium compounds

A relationship is established between the average degree of polycondensation of butyl polytitanates and the intensity of the absorption band of the Ti-O-Ti grouping. The infrared spectra of acyl derivatives of alkyl orthotitanates are described for the first time; the data obtained indicate that the bond between the titanium and the acyl group is ionic in nature. The structure of previously synthesized derivatives of alkyl orthotitanates and dibasic acids is confirmed.     

Evidence for resonance electron transfer in photon excited X-ray satellite spectra of fluorine compounds

The KαL¹/KαL⁰ intensity ratio of fluorine is measured in five fluorine compounds with a crystal spectrometer. An anomalous reduction of this intensity ratio was observed in KF and SrF₂, which is attributed to resonance electron transfer from the metal ion to the spectator vacancy in the fluorine ion. KαL²/KαL⁰ intensity ratio of fluorine is also measured. The measured relative intensities are compared with the theoretical estimates of Aberg. Formerly RSIC     

Intramolecular interactions and characteristic infrared spectra for some organosilicon compounds

The frequencies and intensities in the IR spectra of silicon allyls are used to show that electronic interactions between widely separated atoms cause deviations from additivity in the parameters for the characteristic modes.     

Electronic structure of sulphur compounds VI. Photoelectron spectra of some simple thiocarbonyl compounds

The photoelectron spectra of a number of simple thiones including thiofenchone, thiocarbonates and thioamides have been recorded, and the bands corresponding to ionization energies in the range 7.5–13 eV have been interpreted using vibrational fine structure, comparison of He-I and He-II spectra, and CNDO/S calculations. In all compounds the non-bonded orbital mostly localized on the sulphur atom has the lowest ionization potential. The position of the bonding π and σ orbitals show a marked sensitivity to the nature of the substituents on the thiocarbonyl sulphur atom.     

Electron impact spectra of some alkyl derivatives of water and related compounds

Electron impact energy loss spectra at impact energies of 100 eV and 50 eV and a scattering angle of 2 degrees are presented for alkyl derivatives of H₂O and related compounds. Spectra of H₂O, CH₃OH, CH₃OCH₃, ethylene oxide, CH₃CH₂OH, (CH₃)₂CHOH, (CH₃)₃C C₂H₅OC₂H₅ and tetrahydrofuran are tentatively assigned using derived term values and ionization potentials from photoelectron spectrosc Substituent effects on Rydberg orbital energies are discussed using Taft σ* values.     

The infra-red spectra of some ferroelectric compounds with short hydrogen bonds

The infra-red spectra of KH₂PO₄, NH₄H₂PO₄, NaH₂PO₄, KH₂AsO₄, NH₂H₂AsO₄, Ag₂H₃IO₆ and (NH₄)₂H₃IO₆ and of their deuterated analogues have been recorded at room temperature and some of them also at low temperature in the ferroelectric phase. The interpretation of the particularly interesting spectral region between 3000 and 1500 cm^?1, containing several OH bands, has been made in terms of the tunnelling of the protons between two minima of potential energy. These were taken to be of equal depth in the non-ferroelectric phase and unsymmetrical in the ferroelectric form. A quantum-mechanical treatment of the vibrational problem of the latter type has been carried out and is presented in the Appendix. Good agreement has been found between the theoretically predicted energy levels and the experimental data.     

Au-197 Mössbauer spectra of some gold-boron cluster compounds

The first¹⁹⁷Au Mössbauer spectra for compounds in which gold is bound to boron clusters are reported, and their relation to the structure and bonding involved are discussed.

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Au-197 Mössbauer spectra of some gold-boron cluster compounds

     

Analysis of TOF-SIMS spectra from fullerene compounds

We analyzed TOF-SIMS spectra obtained from three different size of fullerenes (C₆₀, C₇₀ and C₈₄) by using Ga⁺, Au⁺ and Au₃⁺ primary ion beams and investigated the fragmentation patterns, the enhancement of secondary ion yields and the restraint of fragmentation by using cluster primary ion beams compared with monoatomic primary ion beams. In the TOS-SIMS spectra from C₇₀ and C₈₄, it was found that a fragment ion, identified as C₆₀⁺ (m/z = 720), showed a relatively high intensity compared with that of other fragment ions related to C₂ depletion. It was also found that the Au₃⁺ bombardment caused intensity enhancement of intact molecules (C₆₀⁺, C₇₀⁺ and C₈₄⁺) and restrained the fragmentation due to C₂ depletion.     

External bremsstrahlung spectra of the Sr source in some lead compounds measured using NaI detector

The spectral distributions of external bremsstrahlung (EB) excited by beta particles from a ⁹⁰Sr/⁹⁰Y source in thick target compounds PbCl₂, PbF₂, Pb(NO₃)₂ and CdO were measured using a 3.8 cm × 3.8 cm NaI(Tl) crystal. The spectra, unfolded using the Liden-Starfelt procedure, showed fairly good agreement with theory (Tseng and Pratt) at low energies and some deviation (less than 15%) at higher energies. The discrepancy between theory and experiment increases with modified atomic number of the target compound and photon energy. The application of the measured/theoretical spectrum to estimate the bremsstrahlung dose is also discussed.     

He (Iα) photoelectron spectra of some higher aromatic perfluoro compounds

He(Iα) excited photoelectron spectra, the inferred ionisation energies, and their assignment, are presented for perfluoro-benzene, -naphthalene, -anthracene, -phenanthrene, -pyrene and -acenaphthylene.     

Modulated spin structures due to the four-spin exchange interaction in some intermetallic compounds

The model consisting of the two-spin exchange interaction and the four-spin one is studied. The systematic change of the magnetic structures among MnS₂, MnSe₂ and MnTe₂ is shown to be well-explained by this model. The three types of magnetic structures of EuSe is also discussed.