Resonance–Mediated Below–Threshold Delayed Photoemission and Non–Franck–Condon Photodissociation of Cold Oxyallyl Anions

Albeck, Yishai; Lunny, Katharine G.; Benitez, Yanice; Shin, Ashley J.; Strasser, Daniel; Continetti, Robert E.

doi:10.1002/anie.201900386

Title: Resonance–Mediated Below–Threshold Delayed Photoemission and Non–Franck–Condon Photodissociation of Cold Oxyallyl Anions

Journal Article · 18 February 2019 · Angewandte Chemie (International Edition)

DOI: https://doi.org/10.1002/anie.201900386 · OSTI ID:1755313

Albeck, Yishai ^[1]; Lunny, Katharine G. ^[2]; Benitez, Yanice ^[2]; Shin, Ashley J. ^[2]; Strasser, Daniel ^[3];

^[2]

Hebrew Univ., Jerusalem (Israel); University of California San Diego
Univ. of California San Diego, La Jolla, CA (United States)
Hebrew Univ., Jerusalem (Israel)

The photoexcitation of cold oxyallyl anions was studied below the adiabatic detachment threshold at a photon energy of 1.60 eV. Photodetachment was observed through two product channels, delayed electron emission from a long–lived anionic state and dissociative photodetachment via absorption of a second photon. The former produced stable neutral C₃H₄O, while the latter resulted in the concerted elimination of CO+C₂H₄ products. The neutral oxyallyl singlet state has a barrier–free route to cyclopropanone as well as zwitterionic character with a large charge separation and dipole moment. The role of long–lived dipole–bound resonances built on the singlet state below the detachment threshold is discussed. Furthermore, these results provide one of the first observations of delayed photoemission in a small cold molecular radical anion, a consequence of the complex electronic structure of the neutral diradical, and provide an example of resonance–mediated control of the photodissociation processes.

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Research Organization:: Univ. of California San Diego, La Jolla, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Contributing Organization:: US-Israel Binational Science Foundation

Grant/Contract Number:: FG03-98ER14879

OSTI ID:: 1755313

Report Number(s):: BSF--2014071

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 16 Vol. 58; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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74 ATOMIC AND MOLECULAR PHYSICS
anions
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molecular dynamics
oxyallyl anion
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photoelectron spectroscopy
photoelectron-photofragment coincidence
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Title: Resonance–Mediated Below–Threshold Delayed Photoemission and Non–Franck–Condon Photodissociation of Cold Oxyallyl Anions

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