Abstract

The electronic emission and absorption spectra of <i>o</i>-fluorobenzaldehyde have been studied. The emission spectrum recorded on a Fuess glass and a medium quartz spectrograph lies in the region 26 668–17 862 cm<sup>−1</sup> and the absorption spectrum recorded on a Zeiss Q–24 medium quartz spectrograph lies in the region 30 995–24 610 cm<sup>−1</sup>. The O-O band has been observed at 26 337 cm<sup>−1</sup>. The C=O stretching frequency 1733 cm<sup>−1</sup> in the ground state and 1355 cm<sup>−1</sup> in the excited state is most intense and forms progressions of bands both in the emission and absorption spectra. The observed bands have been interpreted as combinations of the C=O stretching frequency and its multiples with other fundamentals. The transition involved is <i>A'–A"</i> (n-π*).

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