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\frac{1}{\lambda_{\mathrm{vac}}}·=·RZ^2·
\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)¶
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\frac{1}{\lambda_{\mathrm{vac}}} = RZ^2 \left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)