MASS SPECTROMETRIC STUDY OF IONIZATION AND FRAGMENTATION OF ETHYLAMINE, DIETHYLAMINE AND TRIETHYLAMINE USING ELECTRON IMPACT TECHNIQUE
MOHAMED ABDEL FATTAH EL-DESAWY;
Abstract
A mass spectrometer of the type Atlas CH-4 is used in combination with deconvoluted first differential (DFD) technique in order to investigate the ionization efficiency (IE) curves for molecular ions [C2H7Nt" , [C4H11N]+. and [C6HtsNt as well as [CH4Nr , [C2H6Nr and [CJHsNr
fragment ions produced from the three molecules, namely ethylamine,
diethylamine and triethylamine. All the studied IE curves are measured for about 3.5 eV above threshold.
The relative intensities of the prominent ions in the mass spectra of the three amine molecules are reported at 70 and 14 eV. The effect of branching groups on the intensity of different fragment ions is discussed. Metastable peaks associated with formation and fragmentation of the studied fragment ions are also reported, and the kinetic energy released (T0.5) values associated with these processes are determined.
The values of ionization energies at threshold are measured at
8.95±0.07, 8.15±0.08 and 7.63±0.07 eV for ethylamine, diethylamine and triethylamine, respectively, and are explained as due to removal of one of lone pair electrons of the nitrogen atom. Also, higher molecular energy levels have been detected in the ionization energy (IE) curves of the molecular ions of the three molecules and some of these levels are compared with other works. Appearance energies (AE,s) ofthe studied fragment ions are measured and reported at threshold and possible fragmentation processes for the formation of these ions have been suggested.
fragment ions produced from the three molecules, namely ethylamine,
diethylamine and triethylamine. All the studied IE curves are measured for about 3.5 eV above threshold.
The relative intensities of the prominent ions in the mass spectra of the three amine molecules are reported at 70 and 14 eV. The effect of branching groups on the intensity of different fragment ions is discussed. Metastable peaks associated with formation and fragmentation of the studied fragment ions are also reported, and the kinetic energy released (T0.5) values associated with these processes are determined.
The values of ionization energies at threshold are measured at
8.95±0.07, 8.15±0.08 and 7.63±0.07 eV for ethylamine, diethylamine and triethylamine, respectively, and are explained as due to removal of one of lone pair electrons of the nitrogen atom. Also, higher molecular energy levels have been detected in the ionization energy (IE) curves of the molecular ions of the three molecules and some of these levels are compared with other works. Appearance energies (AE,s) ofthe studied fragment ions are measured and reported at threshold and possible fragmentation processes for the formation of these ions have been suggested.
Other data
| Title | MASS SPECTROMETRIC STUDY OF IONIZATION AND FRAGMENTATION OF ETHYLAMINE, DIETHYLAMINE AND TRIETHYLAMINE USING ELECTRON IMPACT TECHNIQUE | Other Titles | استخدام مطياف الكتلة فى دراسة تأين وتكسير مركبات إيثيل أمين وداى إيثيل أمين وتراى إيثيل أمين بطريقة التصادم الإلكتروني | Authors | MOHAMED ABDEL FATTAH EL-DESAWY | Issue Date | 2001 |
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