POLARIZATION SPECTROSCOPY OF SrCl: THE $B^{2}\Sigma^{+} - X^{2}\Sigma$ SYSTEM
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Date
1984
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Ohio State University
Abstract
Strontium monochloride radicals were produced in a low pressure flame reaction of Sr and $Cl_{2}$. Using Doppler free polarization spectroscopy large parts of the (0,0), (1,1) and (2,2) bands of the $B^{2}\Sigma^{+} - X^{2}\Sigma$ system were recorded. The identification of the dense spectra was simplified by applying microwave modulated polarization spectroscopy $(MMPS)^{1)}$, a technique by which rotational transitions of the ground state are induced in order to label particular lines in the optical spectrum. About 500 lines were assigned. These optical data were combined with the results of separate microwave measurements of the $X^{2}\Sigma^{+}$ state in a weighted least squares fit yielding highly precise spectroscopic constants of the $B^{2}\Sigma^{+}$ state. For the vibrational analysis bandhead positions with $\Delta v=+1$ were included in the fit. Furthermore microwave-optical polarization spectroscopy $(MOPS)^{2)}$ was used to investigate the unknown hyperfine structure in the $X^{2}\Sigma^{+}$ state. Whereas the hfs could not be resolved at high rotational transitions under the usual conditions (FWHM $\simeq 1$ MHz) the situation was different for $N=2 \leftarrow 1$ and $N=1 \leftarrow 0$ transitions. With the high sensitivity of MOPS hyperfine components with $\Delta J=0,+1$ and $\Delta F=0,+1$ could be observed.
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$^{1)}$ W.E. Ernst, Opt. Commun. 46, 18 (1983). $^{2)}$ W.E. Ernst and T. T\""{o}rring, Phys.Rev.A 27, 875 (1983).
Author Institution: Institut f\""{u}r Molek\""{u}lphysik, Freie Universit\""{a}t Berlin
Author Institution: Institut f\""{u}r Molek\""{u}lphysik, Freie Universit\""{a}t Berlin