Doppler-tuned hyperfine spectroscopy of the lithium ion

We have used the Doppler-tuned ion-beam, laser-spectroscopy method to measure the hyperfine intervals in the 2S3 and 2P3 states of Li+7. Our resolution was 10 times that of the best previous measurement. In contrast to the earlier experimental work we find excellent agreement between our measurements and the theoretical values. © 1978 The American Physical Society.