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We have carried out saturation spectroscopy of the H2O line at 1889.58 cm−1 using a tunable spin-flip Raman (SFR) laser. We have observed Lamb dip widths of the order of 200 kHz, demonstrating the usefulness of the tunable SFR laser for ultrahigh-resolution spectroscopy (resolution ∼ 3 × 108).
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C. K. N. Patel (1974) studied this question.
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