Excited state fragments following molecular ionization and dissociation in strong fields

Nibarger, John P.; Li, Ming; Menon, Saipriya; Gibson, George N.
July 2000
AIP Conference Proceedings;2000, Vol. 525 Issue 1, p483
Academic Journal
We have observed for the first time that charge asymmetric dissociation in diatomic molecules leaves one of the fragments in an electronically excited state. Using a new double pulse technique, we determine the state of the post dissociation fragments. For example, we observed the reaction I[sub 2]+(pulse1)→(I[sub 2][sup 2+])[sup **]→I[sup 0+]+(I[sup 2+])[sup *]+(pulse2)→I[sup 0+]+I[sup 3+] demonstrating that the I[sup 2+] fragment must have been in an excited state. More generally, just as asymmetric dissociation implies that the initial molecular ion is in an excited electronic state, the observation of asymmetric channels in the post-dissociation ionization shows that the ionic fragments are themselves electronically excited. © 2000 American Institute of Physics.


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