Electronic Struc & Magnetism of Inorganic Compounds Vol 6
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- Electronic Struc & Magnetism of Inorganic Compounds Vol 6
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- Royal Society of Chemistry
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- Royal Society of Chemistry
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- 1980
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Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 80 years the Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.
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Electronic Structure and Magnetism of Inorganic Compounds Volume 6
A Review of the Recent Literature
By P. DayThe Royal Society of Chemistry
All rights reserved.
Contents
Chapter 1 Gas-phase Photoelectron Spectroscopy By R. G. Egdell and A. W. Potts, 1,
Chapter 2 Electronic Spectra of Transition-metal Compounds By C. D. Flint,
Chapter 3 Natural and Magnetic Optical Activity By A. J. Mccaffery, 210,
Chapter 4 Magnetic Susceptibility Measurements By A. K. Gregson, P. D. W. Boyd, and K. S. Murray, 233,
Author Index, 297,
CHAPTER 1
Gas-phase Photoelectron Spectroscopy
BY R. G. EGDELL AND A. W. POTTS
1 Introduction
Previous articles in the Specialist Periodical Reports series dealing with photoelectron spectroscopy (p.e.s.) have adopted a broad approach reviewing all aspects of the technique. To keep this contribution for the extended period 1973 — 1977 within manageable bounds we have restricted our attention to gas-phase p.e.s. While our canvas is clearly defined for ultraviolet p.e.s. there is less distinction between gas- and solid-phase X-ray work; core levels are of a largely atomic nature irrespective of the phase under investigation. This article aims to provide comprehensive coverage of the literature up to the end of 1976 and a more selective discussion of papers published in 1977.
During the period covered by this Report the field has continued to expand and the production of p.e. spectra is now a largely routine procedure in many laboratories. Review articles proliferate and may usefully be divided into three categories. First and least numerous are those that provide a thorough coverage of the literature of a given period. Within this group the u.v.-p.e.s. field from 1973 to 1975 has been covered by Baker et al. and the earlier period from 1971 to 1973 by Betteridge and Williams. The X-p.e.s. work published between 1972 and 1975 has been dealt with by Hercules. The second type of review still has a broad scope but adopts a rather more selective and sometimes personalized approach. Such reviews have been given by Price, DeKock and Lloyd, Jonathan, Carlson, Schweitzer, Bahr, and Siegbahn. In this section we must mention the detailed and regular reviews produced by Siegbahn. While dealing with the general field of p.e.s. these lean heavily upon the substantial contributions made by the Uppsala laboratory.
Finally and forming by far the largest part of this section are the reviews or articles addressing themselves to a specific aspect of p.e.s. Thus :he field of high-temperature inorganic studies is admirably covered by Berkowitz while articles by Heilbronner and Maier deal with organic u.v.-p.e.s. A useful review of instruments commonly used in p.e.s. with particular emphasis on their performance is given by Wannberg et al. while Krause deals with the experimental principles of electron spectroscopy. The close affinities between u.v.-p.e. and Rydberg absorption spectra observed in the vacuum U.V. have been stressed by Sandorfy. A review of gas phase X-p.e.s. carried out at Uppsala has been given by Gelius. This deals with the fine high-resolution work carried out with monochromatic X-rays by the Swedish group. A general article on photoemission from atoms and small molecules has been given by Samson. This dwells particularly on accurate intensity measurements in u.v.-p.e.s. and on the measurement of asymmetry parameters.
Although many of the articles mentioned so far include consideration of photoionization theory and the calculation of binding energies, there are now a number of articles dealing specifically with these topics. These tend to deal either with the process of photoionization (Cooper and Marr) and the associated theory of shake-up and shake-off (Fadley) or with the various approximations used in the calculation of binding energies. For X-p.e.s. this includes the calculation of chemical shifts as covered by Basch, Shirley, Schwartz, and Gelius. As regards valence ionization energies, although there have been significant developments in theoretical techniques (see Section 4) no general review on this topic came to our attention. At an elementary level molecular orbital theory is discussed in relationship to u.v.-p.e. by Bock and M01lère while a more thorough treatment with discussion of various semi-empirical MO models is given by Bock et al.
In addition to the articles so far discussed a number of books devoted to p.e.s. have been published. A text by Carlson deals with Auger spectroscopy as well as X-p.e.s. and u.v.-p.e.s. and a recent volume by Rabalais devoted to u.v.-p.e.s. places particular emphasis on the theoretical aspects of the subject. A most useful general book on gas-phase u.v.-p.e.s. written by Eland deals with the elementary theory and practice of the technique in a very readable manner. Two recent volumes bringing together important articles on a wide range of photoelectron topics are those edited by Baker and Brundle and by Briggs. The former work is Part I of a projected three-volume series.
We should also mention the published proceedings of the series of NATO advanced study institutes which have dealt with various aspects of p.e.s., in particular in relation to other techniques used to study the electronic structure of molecules and solids. In a similar vein p.e.s. has been set against other forms of electron spectroscopy including Auger and energy-loss spectroscopy by Brion and in relation to U.V. absorption measurements in a two-volume work by Robin.
Finally there have of course been several conferences in the period covered by this Report either devoted to or touching on p.e.s. The first of these, held at Namure in 1974, was biased towards X-ray work although it did include a useful review by Frost of developments in u.v.-p.e. at that time. The proceedings of the conference were published as Volume 5 of the Journal of Electron Spectroscopy and Related Phenomena and also in a volume edited by Caudano and Verbist. Photoelectron work also occupied a considerable portion of the proceedings of the Sixth Conference on Molecular Spectroscopy held at Durham, England in 1976. The most recent conference dedicated to p.e.s. was held at Uppsala in 1977 and the proceedings are published in Physica Scripta.
In this introduction we have attempted to mention and in some cases comment on the review material currently available in the p.e. field. It should be noted however that refs. 41-45 contain many excellent articles both of a general and of a specialized nature by established authors. They are, however, too many in number to list here and the reader is advised to consult the original collections of articles for further details.
2 Advances in Experimental Techniques
Since the scope of this Report is essentially limited to gas-phase p.e.s. only developments directly relevant to this aspect of the technique will be discussed. In general one of the three basic electrostatic deflection analysers, i.e. the 127° cylindrical, the cylindrical mirror, or the spherical sector, forms the basis of most spectrometers. A few novel arrangements have been described during the period of this Report, most notably the threshold photoelectron or photoionization resonance spectrometer in its various forms.
As might have been expected the principal growth area for p.e.s. in its simple form (i.e. the energy analysis of photoelectrons) has been in techniques associated with the ionization chamber and sample handling. This is exemplified by the recent work of Bulgin et al. who describe a spectrometer incorporating a molecular beam unit which may be operated at temperatures up to 2500 K. Also, in the context of 'unstable' target species, there has been impressive use of laser p.e.s. to study negative ions. This work has been largely associated with the University of Colorado. The p.e. spectrum of a negative ion is obtained using the argon ion laser line at 2.34 eV as photon source and yields highly accurate values for the electron affinity of the neutral species.
The field of e,2e coincidence spectroscopy has also been a growth area and it is now possible to obtain much of the information available from p.e.s. by coincidence work, albeit at a considerable sacrifice in resolution (FWHM ≈ 1.5 eV).
Electron Energy Ana1ysers. — During the period of this Report a number of treatments comparing analyser performance and giving analyser theory have appeared. A particularly thorough study was made by Wannberg et al. who compared a variety of analysers commonly used in p.e.s. Amongst other things they discuss the use of preretardation coupled with fixed-energy analysis and hence fixed-energy resolution as a means of improving the signal (luminosity). This theory also indicates how energy resolution may be profitably increased without sacrifice of signal by using low fixed pass energies in analysers with preretardation facilities. Read et al. and Baker et al. have also considered design requirements for electron energy analysers. The latter authors derive general expressions for transmission in terms of source and analyser dimensions. Arnow has given a general theoretical treatment for the cylindrical electrostatic focusing field while Wannberg et al. considered the focusing properties of a toroidal electrostatic field. They concluded that in certain situations where a large sector angle is not inconvenient a toroidal spectrometer will have a superior transmission to an equivalent hemispherical analyser.
A number of accounts of more or less standard analysers have appeared in the literature. Dromey and Peel describe a computer-controlled 127° cylindrical analyser for u.v.-p.e. work with the facility for on-line deconvolution of spectra. Nedderrmeyer et al. have described a spherical sector analyser with a mean radius of 109.56 mm capable of use in the study of gases or solids, i.e. with a base pressure of 10 nPa. This system is also computer controlled. Several analysers specifically designed to investigate angular dependence of photoemission in the U.V. have also been described. Leng and Nyberg describe a computer-controlled retarding potential device while Mason et al. have given details of a system based on a computer-controlled 180° hemispherical deflection analyser with a mean radius of 38 mm and an acceptance angle of 4.2°. Dehmer et al. have also given an account of a spherical sector analyser with a 22.5mm mean radius designed for measurement of the asymmetry parameter β in u.v.-p.s. In all of these cases the value of β is derived assuming that the light source is unpolarized by measuring the electron emission at two6' or more angles with respect to the direction of the photon beam. The relationship between electron flux and angle is that given previously. Where the photon beam is completely or partially polarized, as is the case when synchrotron radiation is used to excite the spectra, β may be deduced simply by measuring the variation in electron emission in a plane at right angles to the photon beam. The analyser for these measurements may be simply a retarding grid device or for more accurate work a deflection analyser as described by Houlgate et al. (Figure 1). Measurements of the p.e. signal as the analyser is rotated about the photon beam then define β for the particular photoionization process. The relationship between intensity and angle for partially polarized light is also given in the previous Report. To establish β, g, the degree of polarization, must be known. This is normally accomplished by making asymmetry measurements for He 1s-1 ionization for which it is assumed that β = 2 as expected theoretically for a pure s-orbital.
In connection with asymmetry measurements two polarizers designed for use with He-I 58.4 nm radiation have been described. Both are based on multiple reflection from plane gold surfaces. In the case of the design given by Karlsson et al. (Figure 2) four reflections result in a polarization of 97% or greater but a reduction in the photon intensity by approximately two orders of magnitude. The second polarizer designed by Hancock and Samson involves three reflections and produces a polarization of only 84%. The arrangement however has a transmission of 10%. To make use of the polarizers the degree of polarization g must be known. Since He 1s-1 ionization is obviously outside the He-I 58.4 nm range the Ar 3p-1 ionization was used, a value for β of 0.95 [plus or minus] 0.02 being assumed. In Samson's work, g was initially measured using an optical method and this measurement was used to give the value of β for argon as a secondary standard. The particular beauty of the technique is that simple rotation of the polarizer gives all the information necessary for the determination of β while the electron analyser can remain fixed throughout the measurements.
While measurement of asymmetry in the photoemission process is clearly important it is also desirable to be able to measure the relative populations of different ionized states produced at a particular photon energy. These so-called branching ratios are given by the relative intensities of photoelectron bands either corrected for asymmetry or recorded at the 'magic angle' of 54°44'. While spectrometers designed to measure β can therefore be used to give corrected branching ratios, detection at the 'magic angle' can result in a higher electron flux and hence more accurate measurement of the branching ratios. Use of the 'magic angle' is most readily achieved in the cylindrical mirror analyser. Descriptions of such analysers for measurement of branching ratios or partial cross-sections have been given for unpolarized light by Gardner and Samson and for polarized synchrotron light by Woodruff and Marr.
In the area of non-standard spectrometers, Betteridge et al. have described a simple device using a fixed 180° focusing magnetic field and a double-entrance slit system so that the energy spectrum can be examined by scanning the pre-acceleration voltage. This is clearly akin to the electrostatic deflection analyser with fixed pass energy and pre-acceleration scan. Betteridge's analyser scores by eliminating the need for deflection plates and hence the possibility of plate contamination. It is, however, only a one-dimensional focusing device and of course is still subject to slit contamination problems. The performance of the instrument appears to be quite comparable with that of the standard 127° deflection instrument. A simple heated ionization chamber capable of temperatures up to 250 °C has also been used with this instrument.
The simple pill-box analyser outlined previously2 has been further improved by Allen et al. following a computer analysis of electron trajectories. Using pre-acceleration and a pass energy of 1 eV it has been shown capable of producing half-widths (FWHM) of 10 meV on the standard He-I Ar spectrum. This particularly simple design could well be generally useful in u.v.-p.e.s.
A spectrometer which has received particular attention since 1973 is the threshold photoelectron or photoionization resonance spectrometer. Unlike conventional instruments this spectrometer does not use a single line source but is tuned to detect zero-energy electrons formed in the ionization chamber as a function of the energy of a variable-frequency light source (Figure 3). The electron detector is highly efficient for low-energy electrons and since the photoionization cross-section is a step function at threshold the count rate for zero-energy electrons recorded as a function of photon energy produces a spectrum closely analogous to the conventional u.v.-p.e. spectrum. Differences arise as a result of degenerate autoionization from excited neutral states at or very close to the ionization energy for the particular ion state being observed. Photon sources used have included the hydrogen many-lined emission and the noble gas continua, both operated in conjunction with monochromators. Very recently this type of spectrometer has been used with synchrotron radiation and half-widths (FWHM) as low as 3 meV have been reported.
The analyser operates by accelerating all electrons produced in a low electric field and then selecting electrons initially with zero energy from the more energetic electrons. These generally have component velocities normal to the accelerating field so that by selecting only those electrons with velocity in the field direction (i.e. by sterradiancy analysis) a highly efficient detector of zero-energy electrons can be produced. This can be achieved either by using a focusing array of hole or by using a drift tube analyzer which may be replaced or followed by a 127° deflection analyser. A development of the drift tube analyser designed to cut out complicating structure resulting from energetic line-of-sight electrons has recently been described by Peatman. Using this device Peatman studied the vibration-rotation structure of H2+, achieving a measured FWHM of 7 meV. One of the main uses of this type of analyser has been in photoion photoelectron coincidence spectroscopy (sometimes called PIPECO) where the high electron flux results in a useful coincidence rate. It should be commented that from the high-resolution point of view this technique eliminates Doppler broadening effects since the electron is formed with zero kinetic energy.
(Continues...)
Excerpted from Electronic Structure and Magnetism of Inorganic Compounds Volume 6 by P. Day. Copyright © 1980 The Chemical Society. Excerpted by permission of The Royal Society of Chemistry.
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After contractual processing has been completed, the data is initially stored for the duration of the warranty period, then in accordance with the retention periods prescribed by law, especially tax and commercial law, and then deleted after the period has elapsed, unless you have agreed to further processing and use.
Rights of the affected person
If the legal requirements are fulfilled, you have the following rights according to art. 15 to 20 GDPR: Right to information, correction, deletion, restriction of processing, data portability. You also have a right of objection against processing based on art. 6 (1) GDPR, and to processing for the purposes of direct marketing, according to art. 21 (1) GDPR.
Right to complain to the regulatory authority
You have the right to complain to the regulatory authority according to art. 77 GDPR if you believe that your data is not being processed legally.
Right to object
If the data processing outlined here is based on our legitimate interests in accordance with Article 6(1)f) GDPR, you have the right for reasons arising from your particular situation to object at any time to the processing of your data with future effect.
If the objection is successful, we will no longer process the personal data, unless we can demonstrate compelling legitimate grounds for the processing that outweigh your interests or rights and freedoms, or the processing is intended for the assertion, exercise or defence of legal claims.
last update: 10.01.2022