Molecular cross section graphs

Strictly speaking, every molecular species has an ionization efficiency curve of its own depending on the ionization cross section of the specific molecule. In case of methane, this issue has been studied repeatedly (Fig. 2.3). [18] The ionization cross section describes an area through which the electron must travel in order to effectively interact with the neutral and consequently, the ionization cross section is given in units of square-meters. Ionization cross section graphs are all of the same type exhibiting a maximum at electron energies around 70 eV (Chap. 5.1.3). 

Fig 23,5 Plot of molecular cross-sectional area versus the energy of desorption from a lipid-water interface into water. Certain regions on this graph are associated with certain odour types or Qualities, these regions not being sharply defined but merging gradually into each other (1 A = 10 iOm). (After Davies [14].)... 

Fig. 3.4. A two-dimensional cross-section of the structure diagram for an ABC system. The full lines, denoting the catastrophe set, partition nuclear configuration space into its structural regions. The structure associated with each region is indicated by a representative molecular graph. The two broken lines indicate two possible reaction mechanisms for changing the structure A-B-C into the structure B-C-A.

Zhou, P Tian, R Li, Z., Quantitative structure-property relationship studies for col-hsion cross sections of 579 singly protonated peptides based on a novel descriptor as molecular graph fingerprint (MoGF), Anal. Chim. Acta 2007, 597, 214—222. 

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