par Tudorie, Marcela 
;Coudert, L H;Huet, Thérèse ;Jegouso, D;Sedes, G
Référence The Journal of Chemical Physics, 134, 7, page (074314)
Publication Publié, 2011-02
;Coudert, L H;Huet, Thérèse ;Jegouso, D;Sedes, GRéférence The Journal of Chemical Physics, 134, 7, page (074314)
Publication Publié, 2011-02
Article révisé par les pairs
| Résumé : | The hyperfine structure of methyl formate was recorded in the 2-20 GHz range. A molecular beam coupled to a Fourier transform microwave spectrometer having an instrumental resolution of 0.46 kHz and limited by a Doppler width of a few kHz was used. A-type lines were found split by the magnetic hyperfine coupling while no splittings were observed for E-type lines. Symmetry considerations were used to account for the internal rotation of the methyl top and to derive effective hyperfine coupling Hamiltonians. Neglecting the spin-rotation magnetic coupling, the vanishing splittings of the E-type lines could be understood and analyses of the hyperfine patterns of the A-type lines were performed. The results are consistent with a hyperfine structure dominated by the magnetic spin-spin coupling due to the three hydrogen atoms of the methyl group. |
