RESUMO
Emission spectra of the b(1)Sigma(+) --> X(3)Sigma(-) and a(1)Delta --> X(3)Sigma(-) transitions of SO in the near-infrared spectral region were studied at high spectral resolution with a Fourier-transform spectrometer. The 0-0 band of the b --> X system was measured at high signal/noise and four magnetic dipole branches were observed in addition to the previously known five electric dipole branches. From the relative line intensities and the radiative lifetime of the b state, the electric and magnetic transition moments were determined to be µ(0) = +/-0.0042 ea(0), µ(1) = -/+0.0047 ea(0), and M = 0.16 µ(B). All nine electric dipole branches were observed in the 0-0 band of the a --> X transition. Fixing the rotational constants of the X(3)Sigma(-) ground state to microwave values, the following parameters were obtained for the a(1)Delta state (in cm(-1)): v(00) = 5862.1853(1), B(0) = 0.71033746(37), D(0) = 1.16814(46) x 10(-6) (with H(0) fixed to -3.99 x 10(-13)), where the numbers in parentheses are the standard deviations of the parameters. Copyright 1999 Academic Press.
RESUMO
The near-infrared emission spectrum of the A2A' --> X2A" transition of the hydroperoxyl radical, HO2, has been studied by Fourier transform spectrometry. The 000 --> 000 band has been recorded at high spectral resolution. DeltaKa = +/-1 subbands up to Ka' = 9 --> Ka" = 8 and Ka' = 8 --> Ka" = 9 comprising lines from rotational levels up to N' = 32 have been observed. With about a factor of 10 lower intensity, DeltaKa = 0 subbands 0-0 to 6-6 were found which are shown to be due to magnetic dipole transitions. In addition, in the 2-2 sub-band "forbidden" electric dipole lines were observed. These likely are induced by Renner-Teller interaction. Local perturbations extending over 3-10 N' values are found in the Ka' = 0-7 levels of the A2A' state. One series of perturbations is attributed to DeltaKa = 0, DeltaJ = 0 interactions with the 112 level of the X2A" ground state. Copyright 1997 Academic Press. Copyright 1997Academic Press
