Reinhard Jadrny

Vibrational and Vibronic Structure in the Valence Electron Spectra of CH3X Molecules (X=F, Cl, Br, I, OH)

Valence electron spectra of the methyl halides and of methyl alcohol have been induced by means of the HeI resonance radiation at 21.22 eV. A large number of new vibrational bands are reported. The observation of these was facilitated by a high instrumental resolving power and fast data acquisition. In most cases the new bands are observed in 1A1?2E transitions but also the electron band of the 1A1?2A1 transition of CH3I exhibits extensive progressions of closely spaced vibrational bands not previously reported. The vibrational structure of the 1A1?2E transitions is affected by vibronic coupling. The structure of the 2e electron band of CH3Cl probably reflects the operation of the Ham effect. Calculations of the band structure including spin-orbit coupling are performed according to a model which is briefly described.

Isotopic and vibronic coupling effects in the valence electron spectra of H2 16O, H2 18O, and D2 16O

Isotopic shift data for Hei induced high resolution valence electron spectra of H2 16O, H2 18O, and D2 16O are presented. From the differences in the vibrational subspectra we were able to deduce adiabatic ionization energies and geometries of the ions and to assign the excited vibrations to normal modes. The ν2 progression in the 2A1 band was found to be affected by strong vibronic coupling.

Valence Electron Spectra of Benzene and the Hexafluorides of Sulphur, Molybdenum, Tungsten and Uranium. An Application of Multichannel Detector Technique to UV-Valence Electron Spectroscopy

HeI induced valence electron spectra of benzene and the hexafluorides of sulphur, molybdenum, tungsten and uranium are presented together with a HeII spectrum of sulphur hexafluoride. Vibrational band structure has been resolved in the spectra of all molecules and the energies of these bands are reported. A description is also given of the multichannel detector system which has facilitated the recordings of these spectra.

Vibrational and Vibronic Structure in the Valence Electron Spectrum of H2S

The high resolution HeI induced electron spectrum of H2S is presented and the energies of the observed vibrational and vibronic bands are reported. In the 2B1 electron band two progressions of vibrational bands have been measured. In the 2A1 electron band the vibronic structure associated with v2 bending vibrations has been partially resolved. Assignments of the vibronic bands are suggested from a comparison with electronic emission data in terms of the vibrational and angular momentum quantum numbers v2 and K.

The valence electron spectrum of SiF4

Abstract The He I induced valence electron spectrum of SiF 4 is presented and the energies of the bands are reported. The spectrum reveals vibrational structure in three of the four accessible electron bands. Only the band at 19.5 eV has been reported previously to exhibit vibrational progressions.

Valence Electron Spectrum of C6H6 Excited by Linearly Polarized HeI Radiation

Angular distributions of photoelectrons are conveniently studied with the application of a fourfold mirror polarizer on a conventional UV-source. This technique provides plane polarized radiation which promotes maximum sensitivity in the determination of the asymmetry parameter β. As an example polarized HeI radiation has been used to induce the electron spectrum of benzene.

Dependence of gain on plate separation in a parallel plate channel multiplier

Abstract The gain as a function of the distance between the two plates in a parallel plate channel multiplier has been investigated. The multipliers studied were found to function properly at plate distances down to 0.1 mm with a pronounced maximum in gain at a separation of about 0.25 mm.

Valence electron spectroscopy using polarized He I radiation

Abstract Electron spectroscopic measurements by means of polarized He I radiation are presented. Polarization better than 97% is achieved by a fourfold reflection polarizer. Asymmetry parameters β are given for Kr and C 6 H 6 .

Relative internal conversion electron intensities of the 113 keV transition in 177 Hf

The intensities of the internal conversion lines of the 113 keVM1 +E2 transition in177Hf have been measured. From comparison with theoretical conversion coefficients the transition has been found to be (95.2 ± 0.5)%E2 corresponding to ¦δ¦=4.5 ± 0.3. The theoreticalLI andMI conversion coefficients used in the comparison have been increased by 5% according to the result that for pureE2 transitions in the deformed region theLI/LII,LI/LIII,MI/MII, andMI/MIII theoretical ratios are too low (∼5%). Moreover, the present result indicates that theLII/LIII andMII/MIII ratios obtained from the tabulations by Hager and Seltzer and from the computer program by Pauli are too high (1–2%).