Abstract
We report the cation spectra of the cis and trans rotamers of m-fluoroanisole, recorded by using the two-color resonant two-photon mass-analyzed threshold ionization spectroscopic technique. The adiabatic ionization energies of the cis and trans rotamers are 67867±5 and 68304±5cm−1, respectively. The observed active vibrations 6b, 6a, 1, and 12 are found to have frequencies of 473, 549, 714, and 955cm−1 for the cis rotamer and 463, 565, 714, and 962cm−1 for the trans rotamer of m-fluoroanisole in the cationic ground state, respectively. These results show that the frequency depends on the nature, vibrational pattern, relative orientation and the extent of the F and OCH3 substituents participation in the normal vibration.
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