摘要:

The calculations performed in this study were similar to those discussed previously1utilising a computer technique based upon the minimisation of free energy. The programme is capable of handling forty species at each of ten temperatures and a variety of flame stoichiometries can be studied in one operation. In general the concentrations are calculated in moles per mole of feed and those of gaseous species in volume per cent. The effects of nebulising water have been fully investigated on the nitrous oxide- and air-acetylene flames and are hence neglected in this study.

ISSN:0038-7010    

DOI:10.1080/00387017108064631

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Cathodoluminescence has been described by several workers, often excited by a conventional electron gun1,2, or more recently using an electron microprobe3. This phenomenon can be produced by many materials, as described by Leverenz4, although the majority of recent reports have concerned themselves only with rare earth compounds. An attempt is described here to improve the efficiency of the excitation system for the production of cathodoluminescence and to investigate and compare the luminescence obtained from different compounds. For this purpose we have used the focussed electron beam furnace described by Unvala5which utilises a gun geometry similar to that suggested by Cole et al.6. This system is simple to construct and is sufficiently powerful to produce luminescence from compounds other than those of the rare earths and should offer a useful alternative to the more usual excitation systems.

ISSN:0038-7010    

DOI:10.1080/00387017108064632

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Electron paramagnetic resonance is the most effective method of studying the electron exchange in biradicals. Experimental EPR spectra for the solutions of some hydrazyl biradicals are available in the literature (see Refs. [I,2]), however, the interpretation of the spectra is not given.

ISSN:0038-7010    

DOI:10.1080/00387017108064633

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

It is a well-known observation in infrared absorption spectroscopy that certain bands of a spectrum when measured in solution differ considerably from the same bands obtained in solid state by the usual potassium bromide pellet technique2. Since these solid phase spectra are critically affected by the preparation procedures of grinding, mixing, pressure, etc, solution spectra are routinely perferred due to their relatively good reproducibility.

ISSN:0038-7010    

DOI:10.1080/00387017108064634

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The absorption spectra of Lanthanides have been a subject of several investigations1. Recently spectral intensities of Pr3+and Nd3+β-diketonates have been reported2,3by the authors. In Nd3+complexes4I9/2→4G5/2'2G7/2transitions, obeying the selection rule δJ ≤ 2, are known to give rise to intense bands3,4. Since these bands are sensitive to both ligand and solvent, they are known as hypersensitive transitions. The explanation of the phenomenon of hypersensitivity has proved to be an intriguing problem. In the present communication the various theories advanced to explain this phenomenon have been examined in the light of the recent studies of spectral intensities.

ISSN:0038-7010    

DOI:10.1080/00387017108064635

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

We have uncovered strong Fermi resonance coupling2–4inendo,anti-tetracyclo[5.2.1.02,6.03,5]dec-8-en-10-one (I) and the related tetracyclodecan-10-one (II).

ISSN:0038-7010    

DOI:10.1080/00387017108064636

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The ionization of free atoms in flames is a well-known effect and its relevance in atomic absorption spectroscopy is discussed in standard texts(1), (2)For analytical purposes it is important to know whether the degree of ionization will be significant for a given element under selected operating conditions. Appropriate compensation for the effect can then be made if necessary. This note presents tabulated values for the percentage ionization of almost all elements determined by atomic absorption spectroscopy for the three flames most commonly used in this technique. These values were calculated by an ICI. 4130 computer, using a program written in Fortran IV, from the Saha equation(3).

ISSN:0038-7010    

DOI:10.1080/00387017108064637

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

With the advance of atomic absorption spectroscopy and the degree of automation obtained in instruments today, the preparation of calibration curves and the ensuing calculations are, apart from the sample preparation in certain cases, the most time consuming part of an atomic absorption analysis. It is usually at this stage that errors are introduced, either as a result of miscalculation or of the operator's personal bias. Both these factors can be overcome by using a programmable desk calculating system, and would be of special importance to laboratories where routine analyses are conducted. It is also of use in cases where elements are only determined periodically.

ISSN:0038-7010    

DOI:10.1080/00387017108064638

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0038-7010    

DOI:10.1080/00387017108064630

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor