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Communication: Observation of dipole-bound state and high-resolution photoelectron imaging of cold acetate anions
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40. The dipole moment and the frequencies of CH3COO• were calculated at the B3LYP/6–31+G(d,p) level of theory.
43.H. T. Liu, Y. L. Wang, X. G. Xiong, P. D. Dau, Z. A. Piazza, D. L. Huang, C. Q. Xu, J. Li, and L. S. Wang, Chem. Sci. 3, 3286 (2012).
See supplementary material at http://dx.doi.org/10.1063/1.4913924
for the theoretical vibrational frequencies of CH3
COO•, the photodetachment spectra of CH3
showing the ground vibrational level of the dipole-bound state, and the photoelectron images corresponding to Fig. 1
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We report the observation of a dipole-bound state and a high-resolution photoelectron imaging study of cryogenically cooled acetate anions (CH3COO−). Both high-resolution non-resonant and resonant photoelectron spectra via the dipole-bound state of CH3COO− are obtained. The binding energy of the dipole-bound state relative to the detachment threshold is determined to be 53 ± 8 cm−1. The electron affinity of the CH3COO neutral radical is measured accurately as 26 236 ± 8 cm−1 (3.2528 ± 0.0010 eV) using high-resolution photoelectron imaging. This accurate electron affinity is validated by observation of autodetachment from two vibrational levels of the dipole-bound state of CH3COO−. Excitation spectra to the dipole-bound states yield rotational profiles, allowing the rotational temperature of the trapped CH3COO− anions to be evaluated.
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