Photodissociation dynamics of I3 using femtosecond photoelectron spectroscopy

Martin T. Zanni; B. Jefferys Greenblatt; Alison V. Davis; Daniel M. Neumark

doi:10.1117/12.308408

15 May 1998 Photodissociation dynamics of I₃ ^- using femtosecond photoelectron spectroscopy

Martin T. Zanni, B. Jefferys Greenblatt, Alison V. Davis, Daniel M. Neumark

Proceedings Volume 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV; (1998) https://doi.org/10.1117/12.308408
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

The photodissociation dynamics of gas phase I₃ following 390 nm excitation are studied with femtosecond photoelectron spectroscopy. Both I and I₂ photofragments are observed; the I₂ exhibits coherent oscillations with a frequency corresponding to an average vibrational level ((upsilon) ) equals 67. The oscillations dephase by 4 ps and rephase by approximately 45 ps. This can be understood by considering the dynamics of a coherent superposition of vibrational states on the anharmonic I₂ potential. Our results represent the first example of coherently produced photodissociation products undergoing dynamical rephasing. Also for the first time the gas phase frequency of ground state I₃ is determined via a resonance impulsive stimulated Raman scattering process. Finally, the photoelectron spectrum of I₃ yields the vertical detachment energy of I₃ and the spacing between the first two electronic states of the neutral I₃ molecule. The photodissociation dynamics of gas phase I₃ differ considerably from those observed in condensed phase experiments.

Citation Download Citation

Martin T. Zanni, B. Jefferys Greenblatt, Alison V. Davis, and Daniel M. Neumark "Photodissociation dynamics of I₃ ^- using femtosecond photoelectron spectroscopy", Proc. SPIE 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV, (15 May 1998); https://doi.org/10.1117/12.308408

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