Rovibronically selected and resolved two-color laser photoionization and photoelectron study of cobalt carbide cation

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Huang Huang
  • Yih Chung Chang
  • Zhihong Luo
  • Xiaoyu Shi
  • Chow-Shing Lam
  • C. Y. Ng

Detail(s)

Original languageEnglish
Article number094301
Journal / PublicationJournal of Chemical Physics
Volume138
Issue number9
Publication statusPublished - 7 Mar 2013

Link(s)

Abstract

We have conducted a two-color visible-ultraviolet (VIS-UV) resonance-enhanced laser photoionization efficiency and pulsed field ionization-photoelectron (PFI-PE) study of gaseous cobalt carbide (CoC) near its ionization onset in the total energy range of 61 200-64 510 cm-1. The cold gaseous CoC sample was prepared by a laser ablation supersonically cooled beam source. By exciting CoC molecules thus generated to single N′ rotational levels of the intermediate CoC*(2Σ +; v′) state using a VIS dye laser prior to UV laser photoionization, we have obtained N+ rotationally resolved PFI-PE spectra for the CoC+(X1Σ+; v+ = 0 and 1) ion vibrational bands free from interference by impurity species except Co atoms produced in the ablation source. The rotationally selected and resolved PFI-PE spectra have made possible unambiguous rotational assignments, yielding accurate values for the adiabatic ionization energy of CoC(X2Σ+), IE(CoC) = 62 384.3 ± 0.6 cm -1 (7.73467 ± 0.00007 eV), the vibrational frequency ωe+ = 985.6 ± 0.6 cm-1, the anharmonicity constant ωe+χe+ = 6.3 ± 0.6 cm-1, the rotational constants (Be+ = 0.7196 ± 0.0005 cm-1, αe+ = 0.0056 ± 0.0008 cm-1), and the equilibrium bond length re+ = 1.534 Å for CoC+(X1Σ+). The observation of the N+ = 0 level in the PFI-PE measurement indicates that the CoC+ ground state is of 1Σ+ symmetry. Large ΔN+ = N+ - N′ changes up to 6 are observed for the photoionization transitions CoC+(X1Σ +; v+ = 0-2; N+) ← CoC*( 2Σ+; v′; N′ = 6, 7, 8, and 9). The highly precise energetic and spectroscopic data obtained in the present study have served as a benchmark for testing theoretical predictions based on state-of-the-art ab initio quantum calculations at the CCSDTQ/CBS level of theory as presented in the companion article. © 2013 American Institute of Physics.

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Citation Format(s)

Rovibronically selected and resolved two-color laser photoionization and photoelectron study of cobalt carbide cation. / Huang, Huang; Chang, Yih Chung; Luo, Zhihong et al.
In: Journal of Chemical Physics, Vol. 138, No. 9, 094301, 07.03.2013.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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