The potential energy curves of the relevant excited electronic states (Ref. 8 ).
Spectral recording of an absorption spectrum of for a single setting of the undulator optimum. Some of the resonances are indicated.
Detailed spectral recording of the bands for , 4, 5, 8, and 10. The (0,0) band is below the second dissociation limit and is not predissociated; this serves to illustrate the limiting resolution of the spectrometer. The R(0) transition of the (8,0) band is blended by the R(0) transition from the Rydberg series marked with a star. The line marked with a is R(1) transition. For the , 5, and 10 bands, the final representation of a Fano profile as following from the deconvolution procedure is also shown. These are the functional forms represented by the and parameters as listed in Table I and Fig. 6 .
The band of displaying the R(0), R(1), and Q(1) lines recorded by various methods. (a) The high resolution absorption spectrum recorded with the Fourier transform setup at SOLEIL. (b) The absorption spectrum recorded with the 10 m normal incidence scanning monochromator at room temperature. (c) The photoionization spectrum. (d) The spectrum recorded by detection of Lyman- photons originating from the dissociation fragments. (e) The fluorescence from the state decaying to high-lying levels of symmetry in the molecule, with cascades from these states to the state (Ref. 11 ). Note that the intensities in spectra (b)–(d) represent absolute cross sections. Spectra (b)–(e) were obtained at BESSY.
Values of the doubling for the levels as a function of vibrational quantum number. The sign is such that or levels are higher than or levels. The values of the doubling for and 8 have been omitted due to blending of the R(0) and Q(1) transitions.
The fitted parameters for the R(1) transitions compared with the measured values of Glass-Maujean et al. (Ref. 25 ) and the calculated values of Beswick and Glass-Maujean (Ref. 22 ) and Mrugała (Ref. 40 ). Overlapping values have been slightly offset along the x-axis to make the error bars clearly visible.
FT spectrum of the (3,0) band of with a comparison between the two component fits of and and a one component fit of only. The resulting values of the parameters for the two component fits were and for R(1), and and for R(0). In a one component fit, fixing parameters to those obtained by theory (Ref. 40 ) yields for R(1) and for R(0).
The deduced values of the predissociated widths for the level compared with other measured and calculated values currently available in the literature. The calculations of Julienne (Ref. 18 ) have been multiplied by a factor of 4 to correct for an error as specified by Fiquet-Fayard and Gallais (Ref. 20 ).
The deduced values of the predissociated widths for the level compared with other measured and calculated values currently available in literature. Overlapping values have been slightly offset along the x-axis to make the error bars clearly visible.
Transition energies in and predissociated linewidths in for the measured transitions in the system of . The widths measured for the unpredissociated levels and the Q(1) transitions are limited by the Doppler broadening and therefore not specified in the table. represents deviations between the present values minus the previously published data. For excited states , comparison was made with Bailly et al. (Ref. 14 ). For the components in , comparison was made with Takezawa (Ref. 6 ). For and 13, we compare to Croman and McCormack (Ref. 28 ), and for the remaining bands, the measurements of SOLEIL were compared to those from BESSY. The components of are compared with the measurements of Abgrall et al. (Ref. 9 ) and for , we compare to Glass-Maujean et al. (Ref. 29 ). represents a comparison with the MQDT calculations of Glass-Maujean and Jungen (Ref. 42 ); these calculations are available for the Q(1) transitions only.
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