Electron impact ionization cross-sections of toluene

• Published in: Chemical physics letters Vol. 434; no. 4; pp. 188 - 193
• Main Authors: Vacher, J.R., Jorand, F., Blin-Simiand, N., Pasquiers, S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05-02-2007
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2006.12.014

Electron impact ionization of toluene is studied using mass spectrometry. Cross-sections for the formation of the two molecular ions
C
7
H
8
+
and ionic fragments are measured between 10 and 78
eV. Measured total cross-section agrees well with the cross-section given by the theoretical BEB model above 20
eV.
Electron impact ionization of toluene is studied using mass spectrometry. Cross-sections for the formation of molecular ions and ionic fragments are measured between 10 and 78
eV with a total cross-section of
1.5
×
10
-
15
cm
2
towards 60
eV.
C
7
H
8
+
and
C
7
H
7
+
contribute to 75% of the total cross-section at 78
eV. The molecular ion is the most abundant below 25
eV. Four ionic fragments:
C
5
H
5
+
,
C
4
H
3
+
,
C
5
H
3
+
and
C
3
H
3
+
, are detected above 20
eV. Enthalpy considerations can lead to think that
C
5
H
5
+
is issued directly from the molecular ion, whereas the three other species result from two step pathways.