摘要:

The possibility for the concentration sensitivity improvement and the limit of detection of the elements at a laser microspectral analysis is studied by means an absorbtion decrease of the laser emission in the plasma torch.

ISSN:0038-7010    

DOI:10.1080/00387018108062634

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The azido/tetrazole equilibrium has been widely examined1,2,3but most of the studies concern the solid state and the solution. The publications dealing with the vapour phase are rare and contain only qualitative information obtained either by IR or MS. However, it is clearly established that the azido form is stabilized at high temperatures. In the particular case of 2-azidopyridine I, according to1H NMR and IR data, the equilibrium lies strongly on the side of the tetrazole II in solution.3,4In the vapour phase at high temperature, mass spectrometry,5IR,6and the nature of compounds obtained by gas phase pyrolysis7,8of tetrazolo [1,5-α]pyridines, shown that the azide form is favoured in those conditions.

ISSN:0038-7010    

DOI:10.1080/00387018108062635

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Introduction

ISSN:0038-7010    

DOI:10.1080/00387018108062636

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Satisfactory correlations were found of the frequencies of the title band (νCO) with 6+and other substituent constants. The correlations proved valid for benzophenones with both neutral and anionic substituents (more than 100 compounds). The integrated intensities of the νCObands (A1/2CO) did not correlate with any type of substituent constants; the decrease in ACOin the cases of benzophenones with strong electron-releasing substituents was ascribed to a resonance-induced intensity borrowing from νCOBY THE aromatic skeletal bands (8-type). This statement wa confirmed by IR data few deuterated benzophenones.

ISSN:0038-7010    

DOI:10.1080/00387018108062637

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Bile acids are important in the diagnosis of certain diseases. Their mass spectra are usually obtained by electron impact or chemical ionization and are dominated by fragment ions. We have investigated laser desorption (LD) as an ionization method for these compounds. The LD mass spectra contain abundant positive and negative quasimolecular ions. Bile acid salts can be successfully analyzed. In addition, the results help to elucidate details of the LD process.

ISSN:0038-7010    

DOI:10.1080/00387018108062638

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Potassium-39 NMR study of K+ion in molten KSCN and some molten salt mixtures show that the resonance frequency is highly dependent on the nature of the counterion and the technique can be used for studying small changes in the environment of the potassium ion in liquid salts and salt mixtures.

ISSN:0038-7010    

DOI:10.1080/00387018108062639

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The diethyldithiocarbamate chelates of copper (II), lead (II) and tin (IV) have been prepared and characterized. Pure or nearly pure metal diethyldithiocarbamate (DEDTC) chelates could be prepared through recrystallization. The x-ray photoelectron spectra (XPS) for the recrystallized samples were obtained. Three different carbons (C Is) in the diethyldithiocarbamate molecule can be recognized through a computer deconvolution system. Sulfer 2p showed two peaks of spin doublet S 2p1/2and S 2p3/2. Based on the XPS results we may conclude that the diethyldithiocarbamate ligand forms an unusual 4-membered chelate ring structure with the metal ion, both sulfur having bonding with the metal. The N in the DEDTC may also bind with the metal.

ISSN:0038-7010    

DOI:10.1080/00387018108062640

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Some aspects of the Voigt analysis of spectral profiles by using Ballik's method are analysed; possible sources of errors and optimisation of some procedure are discussed.

ISSN:0038-7010    

DOI:10.1080/00387018108062641

出版商:Taylor & Francis Group    

年代:1981

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:10.1080/00387018108062633

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor