The 200Hg and 202Hg 254 nm line centers were measured to 8 and 15 kHz uncertainty, and their isotope shift to about 17 kHz, the most accurate values reported.
Calibrated frequency scans across the intercombination line were obtained by finely tuning the frep frequency while the ECDL was locked to the comb
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Comb-referenced Doppler-free spectrometry of the $^{200}$Hg and $^{202}$Hg intercombination line at 254 nm
The 200Hg and 202Hg 254 nm line centers were measured to 8 and 15 kHz uncertainty, and their isotope shift to about 17 kHz, the most accurate values reported.