High resolution study in gaseous phase of electronic spectra of benzyl-H₇, αD₂, D₇ and orthoxylyl radicals

After a presentation of experimental techniques (emission spectra in gaseous phase, absorption spectra in gaseous phase, fluorescence spectra of xylyls in solid phase, reference spectra, wave length measurement, and recording of band contours), this research thesis reports the determination of the symmetry of the first excited electronic state of benzyl by rotational contour analysis of vibronic bands of the emission spectra of C₆H₅CH₂, C₆H₅CD₂ and C₆H_D5CD₂. The author then reports the study of the rotational contour of some bands of the absorption spectrum of the C₆H₅CH₂ radical. The next part reports the rotational contour analysis of the electronic origin band in the emission spectrum of the orthoxylyl radical at 4683 Angstroms. The last part reports the vibrational analysis of emission spectra of benzyl-H₇, -αD₂ and -D₇ radicals in gaseous phase