Some typical laser-induced fluorescence spectra for the (0,0) vibrational band of the transition of SrF: (a) Spectra taken with a peak laser intensity of : The FWHM width of the spectra is about 150 MHz. The assignments are also shown above the spectral lines. The dark gray (red) line indicates the spectral range for the high-resolution spectra shown in (b). (b) The spectra were taken with a peak laser intensity of . The hyperfine splitting for each rotational line is well resolved. The FWHM width of the spectra is about 15 MHz. Some unassigned spectra in both (a) and (b) are due to the presence of other isotopes of SrF or from other vibrational bands.
(a) Relative peak height and (b) FWHM width for the rotational/hyperfine line vs the laser intensity: The curves indicate fits of the data with Eqs. (1) and (2). The fitting parameters and are 8.1 and , respectively, and .
(a) Relative peak height vs the rotational quantum number for the rotational lines of the branch: Since the average number of scattered photons for all lines is nearly the same, the rotational population is directly proportional to the peak height. (b) The plot of vs . The curve is a linear fit to the data. The best fit of slope is the rotational temperature. The curve in (a) is the rotational Boltzman distribution with the fitted temperature of 1531 K scaled to the data.
(a) The relative flux vs the oven temperature: The largest flux in the figure is in the detection region for all rotational states. (b) The relative flux vs the time showing the stability of the molecular flux.
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