Abstract
For the effective measurement of internal energy correlations of ions, a tandem type mass spectrometer was built. The spectrometer was introduced for the study of unimoleculer decompositions and ion-molecule reactions. The spectrometer has the same 60° sector type magnets with a 7 cm radius. This is now used only for the measurments of unimoleculer decompositions but will be used for ion-molecule reactions with a little rearrengements. In measurements of the uni-molecular decompositions the time constants are given;
t1=1.44 {1.5×(M/V)½+2(M/V)} × 10-7+8.63(M/V)½ × 10-6
t2=1.60(M/V)½×10-5+t1, t3=3.59(M/V)½ × 10-5+t1
In this time region, the calculated data based on simple QET theory of metastable decomposition of moleculer ions depend only on the energy which would be given thermally. The decomposition rates correlate well with the activation energy (or appearance energy) of the product ions. The multi-scanning and integrating data have been performed by a personal computer “PET” through IEEE-488 (GP-IB) bus lines with the controlled interface made of popular digital I. C.
