Experimental study of the Ca2 1S+1S asymptote

Details Experimental study of the Ca2 1S+1S asymptote Experimental study of the Ca2 1S+1S asymptote

2002-10-07

arxiv.org/abs/physics/0210029v1

Physics

Atomic Physics

10 pages, 7 figures

Scientific paper

10.1140/epjd/e2003-00208-4

The filtered laser excitation technique was applied for measuring transition frequencies of the Ca$_2$ B-X system from asymptotic levels of the X$^1\Sigma_{\mathrm g}^{+}$ ground state reaching $v''=38$. That level has an outer classical turning point of about 20~\AA which is only 0.2 \rcm below the molecular $^1$S$+^1$S asymptote. Extensive analysis of the spectroscopic data, involving Monte Carlo simulation, allowed for a purely experimental determination of the long range parameters of the potential energy curve. The possible values of the s-wave scattering length could be limited to be between 250$a_0$ and 1000$a_0$.

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