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Nascent vibrational distribution of the O−2 product ion in the photodissociation of (O2)−n, n = 2–4

✍ Scribed by Chau-Chung Han; Mark A. Johnson

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 560 KB
Volume: 189
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)85232-y

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✦ Synopsis

The nascent vibrational distributions of the 0, photoproduct created in the processes (0,);

obtained at 1.165 and 2.33 eV by analyzing the photoelectron spectrum of the 02 fragment ions. The distributions at 1.165 eV reveal substantial population in the levels 0 6 v< 3 and are reasonably well characterized by Boltzmann distributions with temperatures of 2600 and 1500 K for n = 3 and 4, respectively. The average 0% vibrational energy decreases from 0.1 1 ? 0.0 1 to 0.065 + 0.005 eV in going from n = 3 to n = 4, representing a cooling of about half of the binding energy associated with the fourth 0,. The cooling of the monomer photofragment is correlated with the onset of dimer formation for n> 3.

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