摘要:

When a steady state electric discharge is initiated between a pair of metal electrodes in a binary mixture of gases, the minority constituent has been found to be concentrated in the vicinity of the cathode and diluted near the anode(1–5). Considerable attention has been focussed on the helium-neon mixtures and other mixtures of rare gases. It seems that the only study in helium-argon reported so far is that of Matveeva(2)which was restricted to low gas pressures (>4 torr). In that study Matveeva found that the degree of separation of the mixture was dependent on the gas pressure only in the range 0.4–1.5 torr and independent of pressure in the range 1.5–4 torr. The degree of separation increased linearily with increasing current until a saturation is reached which was attributed to complete separation of the mixture.

ISSN:0038-7010    

DOI:10.1080/00387017208064925

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Infrared and Raman spectra of 2,6-dibromoaniline have been recorded for the first time. The observed bands have been assigned to different modes of vibrations. Using the observed fundamental vibrational frequencies, the thermodynamic functions have been calculated under usual approximations at various temperatures ranging from 100–1500° K.

ISSN:0038-7010    

DOI:10.1080/00387017208064926

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A complete mass spectral fragmentation pattern of naturally abundant tetragermane is presented. The mass spectrum shows a fragmentation pattern of the four different types of ions with the following relative order of intensities: M2> M3> M4> M1. The base peak lies at m/e 148 in the Ge2Hx+=0→6 region and not in the parent region.

ISSN:0038-7010    

DOI:10.1080/00387017208064927

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Rotational structure of (1,0) band of the (A-X)½system of SnF molecule has been photographed in the second order of a 10.6 meter concave grating spectrograph. The rotational constants, as determined from the analysis, have been reported to be

ISSN:0038-7010    

DOI:10.1080/00387017208064928

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

In the course of our investigation1,2,3of metal pollutants in ambient air using flameless atomic absorption spectroscopy, we have encountered difficulties in obtaining carbon rods which were sufficiently free of metallic impurities. Since carbon is employed as a means of atomization in several non-flame cells described in the literature and available commercially, we felt that it is important to note that none of the carbon rods that we have studied were free of metallic impurities. Various grades of spectroscopic carbon electrodes from several manufacturers have been examined. Some brands were significantly purer than others, and the extent of impurity has been found to vary from lot to lot from the same manufacturer. We have not attempted to determine the concentration levels of the various impurities.

ISSN:0038-7010    

DOI:10.1080/00387017208064929

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The reactions of nitrosobenzenes have been the subject of much study and many publications. However, not unlike other projects, at least as many questions have been raised as have been answered. There are several nitrosobenzene reactions which are of particular interest to us and we would like to raise a few more questions concerning their mechanisms. Nitrosoarenes are reported to undergo cycloaddition reactions with diphenylketene to yield 3 or 4-oxazetidinones depending upon ring substituents in the nitrosoarene.1More recently nitrosoarenes have been shown to undergo a similar cycloaddition reaction with ketenimines (nitrogen analogs of ketenes), but only the 3-iminosubstituted oxazetidine (the isomer unexpected from polar theory) is obtained regardless of ring substituents in the nitrosoarene.2A related problem is the 1,4-cycloaddition of nitrosobenzene and cycloheptadiene and the 1,6-cycloaddition of nitrosobenzene and cycloheptatriene.3,4The observed differences in products have been attributed to a variation in the mode of reaction.4Concerted processes were postulated to give 1,4-addition while stepwise processes lead to 1,6-addition.

ISSN:0038-7010    

DOI:10.1080/00387017208064930

出版商:Taylor & Francis Group    

年代:1972

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:10.1080/00387017208064924

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor