Probing la and Ce Excited-State Reactivity with Resonant Two-Photon Ionization Spectroscopy

W. Ruchira Silva, Maria Fitian, Dong Sheng Yang

Research output: Contribution to journalArticlepeer-review

Abstract

Dehydrogenation and C-C bond cleavage of 1-butyne by the excited states of La and Ce atoms are investigated in laser-ablation metal molecular beams. The excited states of the metal atoms are prepared by resonant excitation, detected by resonant two-photon ionization spectroscopy, and the reaction products are monitored by photoionization time-of-flight mass spectrometry. The reactivities of La∗ [5d2(3F)6p (4G5/2°)] and Ce∗ [4f5d(3F°)6s6p(3P°) (5H5)] excited states are observed to be higher than those of the initial states of the corresponding metal atoms. The higher reactivities of the excited states are attributed to their higher energies and favorable electron configurations to form two covalent bonds of the metal-insertion intermediates. Although both excited La and Ce atoms show increased reactivities, the enhancement for Ce is much more pronounced than that of La, which cannot be explained by electron configurations alone. The larger reactivity enhancement from the initial states to the excited state of the Ce atom than that of La is due to the longer lifetime of the Ce excited state.

Original languageEnglish
Pages (from-to)7613-7620
Number of pages8
JournalJournal of Physical Chemistry A
Volume126
Issue number42
DOIs
StatePublished - Oct 27 2022

Bibliographical note

Funding Information:
The authors are grateful for the financial support from the National Science Foundation Division of Chemistry (Chemical Structure, Dynamics, and Mechanisms, grant no. 1800316, DSY). The authors acknowledge the helpful discussion with Chanze Filippi at Siena College.

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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