MASS SPECTROMETRIC STUDY OF THE REACTIONS OF SOME HYDROCARBONS WITH ACTIVE NITROGEN

1959 ◽  
Vol 37 (3) ◽  
pp. 579-582 ◽  
Author(s):  
John T. Herron ◽  
J. L. Franklin ◽  
Paul Bradt
Keyword(s):  
Mass Spectrometer ◽  
Mass Spectra ◽  
Flow System ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
Active Nitrogen ◽  
Cyano Radical

The reactions of active nitrogen with acetylene, ethylene, and propylene have been studied in a flow system using a mass spectrometer to analyze the products continuously. Certain features of the mass spectra of the products can be explained on the basis of cyano radical replacement reactions.

Mass spectrometric study of the reaction of nitrogen atoms with acetaldehyde

1968 ◽  
Vol 302 (1469) ◽  
pp. 167-183 ◽  
Keyword(s):  
Reaction Mechanism ◽  
Mass Spectrometer ◽  
Rate Constant ◽  
Electric Discharge ◽  
Flow System ◽  
Hydrogen Abstraction ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
System A

The reaction of nitrogen atoms, produced by an electric discharge, with acetaldehyde has been studied in a flow system, a mass spectrometer being used to follow the course of the reaction. Sampling was carried out through a small hole in a gold diaphragm. The main stable products were HCN, H 2 and CO; a small amount of glyoxal was also formed. In addition appreciable amounts of a substance yielding ions of m/e = 43 were obtained. Arguments are presented for identifying this with the radical CH 2 CHO. Small amounts of a product giving ions of m/e = 86 were also produced. The nature of this material is discussed. No evidence was obtained for any hydrogen abstraction by nitrogen atoms. Experiments were also carried out with CH 3 CDO to clarify certain aspects of the proposed reaction mechanism . A few experimental results obtained with propionaldehyde can be understood in similar terms. The rate constant of the reaction N + CH 3 CHO → HCN + H 2 + HCO was deduced to be 1.20 ± 0.15 x 10 10 mole -1 cm 3 s -1 at 296°K.

Mass-spectrometric study of the cyclization of diazo compounds. 10. 2-Diazomalonic acid amides. Mass spectra of the negative ions

1987 ◽  
Vol 23 (7) ◽  
pp. 773-775
Author(s):  
A. T. Lebedev ◽  
A. G. Kazaryan ◽  
V. A. Bakulev ◽  
Yu. M. Shafran ◽  
V. S. Fal'ko ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Negative Ions ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Diazo Compounds ◽  
Spectrometric Study

The mass spectrometric study of the reaction of methyl radicals with oxygen

1963 ◽  
Vol 274 (1358) ◽  
pp. 306-318 ◽  
Keyword(s):  
Mass Spectrometer ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Small Hole ◽  
Hydrogen Iodide ◽  
Spectrometric Study ◽  
Methyl Radicals

The reaction between oxygen molecules and methyl radicals, produced b y the photo - dissociation of methyliodide, has been studied using a mass spectrometer which samples directly through a small hole from the gas emerging from the illuminated zone. The effect of adding hydrogen iodide has also been examined. I t has been found that methanol and form aldehyde are formed in equimolar amounts together with a small quantity of m ethyl hydroperoxide. The yield of the latter is greatly increased by adding small percentages of hydrogen iodide. Larger additions produce some water and methane. To account for the results obtained here, together with those obtained by others, we suggest the following mechanism.

Photochemical Studies by Means of a Field Ion Mass Spectrometer

1966 ◽  
Vol 21 (1-2) ◽  
pp. 135-140 ◽  
Author(s):  
H. Okabe ◽  
H. D. Beckey ◽  
W. Groth
Keyword(s):  
Mass Spectrometer ◽  
Mass Spectra ◽  
Flow System ◽  
Low Pressure ◽  
Ion Source ◽  
Mass Spectrometric ◽  
Gas Pressure ◽  
Spectrometric Investigation ◽  
Mercury Lamp ◽  
Mass Spectrometric Investigation

A mass spectrometric investigation was carried out on the direct photolyses of propene, 1-butene, and hydrazine at 1849 A with a field ion source in a flow system. Comparisons were made with Pt tip and wire emitters. It was found that, without illumination, mass spectra obtained with the wire were accompanied by a number of fragment peaks amounting to almost 1%. Since these peaks interfere with those produced photochemically, the tip emitter was used mostly for the photochemical studies although it gave 100 times less current and was less stable. The photochemical products formed at a gas pressure of 10 μ by a low pressure mercury lamp were detected after approximately 10 m sec. The three main peaks observed in the propene photolysis were at masses 27, 28, and 56, indicating the processes:C3H6+hv→C2H3+CH3, C3H6+hv→C2H4+CH2, CH2+C3H6→C4H8.The photolysis of 1-butene gave four main peaks at masses 40, 41, 42, and 70, suggesting steps, C4H8+hv→C3H4+ (H+CH3) or CH4, C4H8+hv→C3H5+CH3, C4H8+hv→C3H6+CH2, CH2+C4H8C5H10.The only peak found with the photolysis of hydrazine was at mass 17, indicating the step, N2H4+hv→NH3+NH.The possibility of forming these products by secondary processes is discussed.

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