RESUMO
We report the laser excitation and dispersed fluorescence spectra of the Ã2E <-- &Xtilde;2A1 transition of the jet-cooled MgCH3 radical. Improvements to the experiment have allowed the observation of 6(1)0 and 2(1)0 vibronic features not previously observed. Analyses of these bands, along with the previously reported 0(0)0 spectra, yield the rotational constants and values of the Coriolis and the spin-orbit coupling constants for the radical's Ã2E state. We also are able to rather completely characterize a small, dynamic Jahn-Teller effect. The dispersed fluorescence spectrum was analyzed and all observed &Xtilde;2A1 state vibrational features were assigned. Copyright 1999 Academic Press.
RESUMO
We have obtained high-resolution Fourier transform emission spectra of the à left and right arrow &Xtilde; transition of the jet-cooled p-xylyl radical in the 450-nm spectral region. The band contours of several vibronic bands are examined. By using the rotational constants obtained from previous high-resolution LIF spectra and information about the torsional constants from dispersed fluorescence experiments, both a-type and b-type band contours are simulated. Based on symmetry arguments and the results of the simulation, we have reassigned the 6a and 6b vibrational mode frequencies of the ground electronic state of the p-xylyl radical. Copyright 1999 Academic Press.
RESUMO
High-resolution, rotationally resolved, laser-induced fluorescence (LIF) spectra for the origin band, as well as several transitions involving vibrationally excited levels of the Ã2Pi <-- &Xtilde2Sigma+ electronic transition of the MgNC radical, have been recorded using the output of a pulse-amplified Ti:Sapphire ring laser. The MgNC radical was generated in a supersonic free jet expansion by simultaneous laser ablation of a magnesium rod and photolysis of acetonitrile (CH3CN). Rotational analysis yielded molecular constants for both the ground and excited states of the studied vibronic transitions. The molecular constants for the vibrationless state of the &Xtilde state are in excellent agreement with previous microwave studies of MgNC. Since the à electronic state of MgNC is a linear 2Pi state, the bending vibronic level structure is subject to both Renner-Teller and spin-orbit coupling. Suggested vibronic assignments of the observed transitions, made considering both these interactions and with the aid of the rotational analysis, are discussed. Copyright 1999 Academic Press.
RESUMO
The high resolution, rotationally resolved laser induced fluorescence spectra for the A2A1 left and right arrow X2E transitions of CF3O and CF3S were recorded. In addition to the origins, the symmetric vibrational band 301 and the nontotally symmetric bands 501 and 601 were analyzed for CF3O, while for CF3S the symmetric bands 101, 201, and 301, as well as the nontotally symmetric bands 601, 301501, and 301601, were analyzed. Copyright 1997 Academic Press. Copyright 1997Academic Press
