A high-precision measurement of the stark shift of the sodium D1-line

Using laser—atomic-beam spectroscopy and a special field arrangement the Stark shift of the sodium D₁-line was determined to be 48.986 (112) kHz (kV/cm)^?2. Using the literature value for the scalar polarizability of $\text{2}{}^2\text{S}{}_{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}$, 39.7 (8) kHz (kV/cm)^?2, the polarizability of $\text{2}{}^2\text{P}{}_{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}$ was derived to be 88.69 (81) kHz (kV/cm)^?2.