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Femtochemistry of mass-selected negative-ion clusters of dioxygen: Charge-transfer and solvation dynamics

Paik, D. Hern and Bernhardt, Thorsten M. and Kim, Nam Joon and Zewail, Ahmed H. (2001) Femtochemistry of mass-selected negative-ion clusters of dioxygen: Charge-transfer and solvation dynamics. Journal of Chemical Physics, 115 (2). pp. 612-616. ISSN 0021-9606. https://resolver.caltech.edu/CaltechAUTHORS:20160819-085640846

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Abstract

Femtosecond, time-resolved photoelectron spectroscopy is used to investigate the dissociation dynamics of mass-selected anionic molecular-oxygen clusters. The observed transient photoelectron signal for the clusters (O_2)^−_n  (n = 3–5) shows the O^−_2 production; for n = 1 and 2, we observe no time-dependence at this wavelength of 800 nm. The observed transients are bi-exponential in form with two distinct time constants, but with clear trends, for all investigated cluster sizes. These striking observations describe the reaction pathways of the solvated core and we elucidate two primary processes: Charge transfer with concomitant nuclear motion, and direct dissociation of the O^−_4 core-ion via electron recombination; the former takes 700–2700 fs, while the latter is on a shorter time scale, 110–420 fs. Both rates decrease differently upon increasing cluster size, indicating the critical role of step-wise solvation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.1384549DOIArticle
http://scitation.aip.org/content/aip/journal/jcp/115/2/10.1063/1.1384549PublisherArticle
Additional Information:© 2001 American Institute of Physics. Received 28 March 2001; accepted 17 May 2001. NJK was supported by postdoctoral fellowships program from the Korea Science & Engineering Foundation (KOSEF) and by Caltech. TMB acknowledges financial support from the Alexander von Humboldt foundation and is grateful to Professor Ludger Wöste for help and support.
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Korea Science and Engineering FoundationUNSPECIFIED
CaltechUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20160819-085640846
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160819-085640846
Official Citation:Femtochemistry of mass-selected negative-ion clusters of dioxygen: Charge-transfer and solvation dynamics D. Hern Paik, Thorsten M. Bernhardt, Nam Joon Kim and Ahmed H. Zewail J. Chem. Phys. 115, 612 (2001); http://dx.doi.org/10.1063/1.1384549
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ID Code:69772
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:23 Aug 2016 00:04
Last Modified:03 Oct 2019 10:25

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