Spectrum of Br V

Charan J. Budhiraja; Y. N. Joshi

doi:10.1139/p71-048

Spectrum of Br V

Canadian Journal of Physics ◽

10.1139/p71-048 ◽

1971 ◽

Vol 49 (3) ◽

pp. 391-393 ◽

Cited By ~ 17

Author(s):

Charan J. Budhiraja ◽

Y. N. Joshi

Keyword(s):

Ionization Potential ◽

Electrodeless Discharge ◽

Discharge Source

The spectrum of Br V has been revised and extended using an electrodeless discharge source. Twelve new lines have been assigned to the spectrum. A tentative value of the ionization potential has been found to be 502 860 cm−1 (62.33 eV).

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PRIMARY PROCESS STUDIES BY MONOISOTOPIC PHOTOSENSITIZATION ON THE REACTIONS OF Hg 6(3P1) ATOMS WITH ALKYL CHLORIDES

Canadian Journal of Chemistry ◽

10.1139/v64-303 ◽

1964 ◽

Vol 42 (9) ◽

pp. 2056-2064 ◽

Cited By ~ 4

Author(s):

J. K. S. Wan ◽

O. P. Strausz ◽

W. F. Allen ◽

H. E. Gunning

Keyword(s):

Mercury Vapor ◽

Quantum Yields ◽

Primary Process ◽

Reaction Parameters ◽

Specific Nature ◽

Electrodeless Discharge ◽

Discharge Source ◽

Bond Scission ◽

Decomposition Formula ◽

Process Studies

The specific nature of the primary process in the reaction of 202Hg 6(3P1) atoms, photoexcited in natural mercury vapor by a cool 202Hg electrodeless discharge source, with CH3Cl has been examined in detail. Primary C–Cl bond scission occurs with unit efficiency. Quantum yields (φ) for the two primary modes of decomposition[Formula: see text]were found to have values of 0.71 (b) and 0.29 (a). The effect of various reaction parameters on the 202Hg enrichment in the calomel product has been investigated and the importance of isotopic mercury depletion in the reaction zone demonstrated by the use of intermittent illumination.A brief study of the reaction of ethyl, n-propyl, i-propyl, t-butyl, and n-amyl chlorides has revealed a relation between the molecular structure of the alleyl chloride and the efficiency of the monoisotopic route (a) to calomel formation. Thus, while the reactions of all the normal alkyl chlorides have φa values between 0.29 and 0.32, φa (isopropyl chloride) is only 0.22 and φa (t-butyl chloride) is 0.17.

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An Attack on the Contamination Problem in the Electron Microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100061859 ◽

1967 ◽

Vol 25 ◽

pp. 368-368

Author(s):

J. J. Kelsch ◽

A. Holtz

Keyword(s):

Electron Microscope ◽

Pressure Gradient ◽

Ionization Potential ◽

Simple Solution ◽

Specimen Surface ◽

Contamination Rate ◽

Local Pressure ◽

High Ionization ◽

Hydrocarbon Molecules ◽

Contamination Problem

A simple solution to the serious problem of specimen contamination in the electron microscope is presented. This is accomplished by the introduction of clean helium into the vacuum exactly at the specimen position. The local pressure gradient thus established inhibits the migration of hydrocarbon molecules to the specimen surface. The high ionization potential of He permits the use of relatively large volumes of the gas, without interfering with gun stability. The contamination rate is reduced on metal samples by a factor of 10.

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