Substituent effects in the field ionisation mass spectra of aryl O-Glucosides

1970 ◽  
pp. 1269b ◽  
Author(s):  
G. O. Phillips ◽  
W. G. Filby ◽  
W. L. Mead
Keyword(s):  
Mass Spectra ◽  
Substituent Effects ◽  
Ionisation Mass

Chemical ionisation mass spectra of urea derivatives of diisocyanates

Chemosphere ◽  
1984 ◽  
Vol 13 (11) ◽  
pp. 1169-1175 ◽  
Author(s):  
Carl-Axel Nilsson ◽  
Ann Gudéhn
Keyword(s):  
Mass Spectra ◽  
Urea Derivatives ◽  
Derivatives Of ◽  
Chemical Ionisation ◽  
Ionisation Mass

Chemical ionisation mass spectra of explosives

1974 ◽  
Vol 9 (3) ◽  
pp. 359-364 ◽  
Author(s):  
R. G. Gillis ◽  
M. J. Lacey ◽  
J. S. Shannon
Keyword(s):  
Mass Spectra ◽  
Chemical Ionisation ◽  
Ionisation Mass

Field Ionisation Studies Using a Double Focussing Mass Spectrometer

1966 ◽  
Vol 21 (6) ◽  
pp. 776-779 ◽  
Author(s):  
J. H. Beynon ◽  
A. E. Fontaine ◽  
B. E. Job
Keyword(s):  
Mass Spectrometer ◽  
Single Molecule ◽  
Mass Spectra ◽  
Ion Source ◽  
Energy Spread ◽  
Small Energy ◽  
Intense Field ◽  
Ionisation Mass

Intense field ionisation mass spectra have been obtained with an A.E.I. M.S.7 mass spectrometer, used with very simple modifications to the ion source.Some features of the spectra of a variety of compounds are given and the spectrum of acetone is discussed in detail. A special feature of this spectrum is the variety of ions with a mass greater than that of a single molecule.The relatively small energy spread of the field ion source enabled resolving powers, higher than those possible with a spark source, to be obtained. Multiplets occurring in the spectra were easily resolved.

Substituent effects in mass spectra of monosubstituted benzils

1975 ◽  
Vol 10 (4) ◽  
pp. 295-312 ◽  
Author(s):  
Kenneth E. Richards ◽  
Blair N. McMaster ◽  
Graeme J. Wright
Keyword(s):  
Mass Spectra ◽  
Substituent Effects

Substituent effects in the mass spectra of diethyl phenyl phosphates

1989 ◽  
Vol 24 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Concetta Kascheres ◽  
Mirtes Sintoni
Keyword(s):  
Mass Spectra ◽  
Substituent Effects

ortho-Effects in Mass Spectra. Alteration of the Molecular-Ion Energy Distribution in Disubstituted Acetanilides

1972 ◽  
Vol 27 (4) ◽  
pp. 670-677 ◽  
Author(s):  
Steven Benezra ◽  
Maurice Bursey
Keyword(s):  
Excited State ◽  
Mass Spectra ◽  
Transition Probability ◽  
Substituent Effects ◽  
Quasi Equilibrium ◽  
Ion Energy ◽  
Ion Energy Distribution ◽  
Molecular Ion ◽  
Equilibrium Calculations ◽  
Excitation Probability

Abstract Simplified quasi-equilibrium calculations performed on the mass spectra of dihalosubstituted phenyl acetates and acetanilides again uncover the same substituent effects on the rise of K with E for the loss of ketene from phenyl acetates as was determined for the monosubstituted phenyl acetates. However, a new effect is found for the disubstituted acetanilides, removal of excitation probability for low-lying energy states of the molecular ion. This effect parallels the removal of transition probability for the lowest excited state of the neutral molecule.

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