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Species-Selected Mass-Analyzed Threshold Ionization Spectra of m-Fluoroaniline Cation

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Abstract:

Two-color resonant, two-photon mass-analyzed threshold ionization (MATI) spectroscopy was used to probe the ionic properties of m-fluoroaniline (MFA). The species selection from a mixture was achieved by tuning the frequency of the excitation laser to a specific intermediate level of MFA for the successive excitation, followed by pulsed field ionization. The MATI spectra were recorded by ionizing via the 00 vibrationless and the 41, 151, and 9b1 vibrational levels in the S1 state. The adiabatic ionization energy of MFA was determined to be 64 159 ± 5 cm-1 (7.9542 ± 0.0006 eV). Analysis of the spectral features shows that the active modes of the ion are closely related to the specified vibrations of the neutral. These findings indicate that the geometry of the ion is quite similar to that of the neutral in the S1 state.

Keywords: CATION; EXCITATION; IONIZATION; MASS-ANALYZED; RESONANT; SELECTION; SPECIES; SPECTROSCOPY; THRESHOLD; TWO-PHOTON

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702011951632

Affiliations: 1: Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan, Republic of China; and Department of Chemistry, National Taiwan University, Taipei 106, Taiwan, Republic of China 2: Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan, Republic of China

Publication date: February 1, 2001

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