| Abstrakt: |
Using mass spectrometric technique, the effect of geometrical isomerism on the first and higher appearance energy values for CH , CH and CH, ions obtained from cis-2-butene and trans-2-butene is reported. The structure in the ionization efficiency curves (studied for 9 eV above threshold) for the same ions obtained from the two isomers is reported and compared. It is believed that at threshold CH fragment is formed from the two isomers as methallyl ion. For CH fragment formed from the cw-isomer at threshold the proposed structure is the propargyl ion with ΔH equal to 279-4 kcal/mole while for that ion obtained from transisomer the proposed structure is the allenyl ion with ΔH equal to 296.6 kcal/mole. [ABSTRACT FROM AUTHOR] |
