Showing papers on "Photoemission spectroscopy published in 1969"
TL;DR: In this article, the electronic states of cyclopropane, ethylene oxide, ethylenimine, and diaziridine were investigated using gas phase and condensed phase vacuum ultraviolet spectroscopy, photoelectron spectrographs, and Gaussian orbital self-consistent field calculations.
Abstract: The electronic states of cyclopropane, ethylene oxide, ethylenimine, and diaziridine were investigated using gas‐phase and condensed‐phase vacuum ultraviolet spectroscopy, photoelectron spectroscopy, and Gaussian orbital self‐consistent field calculations. Correlation of the gas‐phase and condensed‐phase optical spectra of cyclopropane with the first band in its photoelectron spectrum confirms the presence of Rydberg transitions in the optical spectrum involving excitation of an electron from the 3e′ sigma level. The valence shell spectrum of cyclopropane is complex but is dominated by two very strong 1A1′ → 1E′, σ → σ*, excitations. The Rydberg spectrum of ethylene oxide is reassigned to include the two absorptions in the 55 000–65 000‐cm−1 region, all bands originating from the 2b2π orbital, while its valence shell spectrum is closely related to that of cyclopropane. Similar but less conclusive results were obtained for ethylenimine. Virtual orbital calculations of σ → σ* excitation energies gave result...
216 citations
TL;DR: In this paper, the halfwidth of the 584 A helium line emitted from a variety of sources was investigated and the contribution of the thermal motion of the photoionized gas to the spread in the energy of the ejected photoelectrons was discussed.
Abstract: The factors causing line broadening in photoelectron spectroscopy are discussed. Experimental results are given for the half‐width of the 584 A helium line emitted from a variety of sources. Typical half‐width values lie between 1 and 6.5 mV, which corresponds to 0.027 and 0.18 A, respectively. Curves are presented showing the contribution of the thermal motion of the photoionized gas to the spread in the energy of the ejected photoelectrons.
65 citations
TL;DR: In this article, high-resolution photoelectron spectra of ammonia and d 3 are reported, which show two ionization processes corresponding to ionization from the 3a and 1e molecular orbitals.
54 citations
TL;DR: In this article, it was shown that the Franck-Condon factors for the probability of vibrational excitation, determined by photoelectron spectroscopy measurements, can be completely erroneous depending upon the mode of excitation.
39 citations
36 citations
TL;DR: In this article, an assignment of the photoelectron spectrum of carbon tetrafluoride is made by comparison with calculated molecular orbital energies; they deduce a similar assignment for the bands in the spectra of silicon and germanium tetrafluorides and make some suggestions about the bonding in these compounds.
28 citations
TL;DR: In this paper, the photoelectron spectrum excited by He(I) radiation in the open-shell species is reported, and interpreted in general terms, and the spectrum is shown to be stable.
26 citations
18 citations
TL;DR: In this paper, the appearance of molecular pyridine ions has been studied up to 13 eV by photoionization measurements and by photoelectron spectroscopy using the Ar and Ne resonance lines.
14 citations
11 citations
TL;DR: In this paper, the features, problems, and capabilities of applied Auger and photoelectron spectroscopy have been characterized and discussed. But the results are limited to a single image.
Abstract: Various possibilities of Auger and photoelectron spectroscopy as an analytical technique are discussed. In some applications simple electrostatic analyzers with coarse resolution may suffice and even be preferable. Typical spectra obtained with a hemispherical electrostatic analyzer of 0.6% energy resolution are presented and discussed. Such factors as sample thickness, sample potential, surface contamination, and incident angle of the exciting x rays have been found to affect the quality and character of the observed spectra. These results characterize some of the features, problems, and capabilities of applied Auger and photoelectron spectroscopy.
TL;DR: In this article, five electronic states of the diborane ion were observed in the photoelectron spectrum of DIBORANE using the 584 A He resonance line and a planar retarding field spectrometer.
Abstract: Five electronic states of the diborane ion are observed in the photoelectron spectrum of diborane using the 584 A He resonance line and a planar retarding-field, spectrometer.
TL;DR: In this paper, the authors used x-ray photoelectron spectroscopy (XPS) to study N(E) for the valence bands of Fe, Co, Ni, Cu, and Pt.
Abstract: Photoelectron spectroscopy offers one of the most direct methods for observing the density‐of‐states function N(E) in metals. We have used x‐ray photoelectron spectroscopy (XPS) to study N(E) for the valence bands of Fe, Co, Ni, Cu, and Pt. X rays offer the advantage over lower‐energy photons that the directly observable kinetic energy spectrum is probably more closely related to N(E). The final electron states are true continuum states, undistorted by the lattice potential, and they cannot affect the observed spectrum significantly. A disadvantage of x‐ray photoelectron spectroscopy is the relatively poor resolution presently available. Photoelectrons were ejected from samples of the above metals by MgKα x rays from a specially‐constructed nonmagnetic x‐ray tube. The electrons were magnetically analyzed in the Berkeley Iron‐Free Spectrometer. As the photoemission occurs in a region within only a few hundred angstroms of the surface, surfaces had to be cleaned by heating our sources in a stream of H2. The...