Saturation Spectroscopy of H13C14N Absorption Lines

SummaryWe present a saturated spectroscopy measurement of H
¹³
C
¹⁴
N hydrogen cyanide 2ν
3
band absorption lines. The system employed a continuously-tunable laser referenced to stabilised optical frequency comb, which allowed us to scan the H
¹³
C
¹⁴
N spectrum with sub-kHz precision. The sub-Doppler spectroscopy scheme and the third-harmonics synchronous detection allowed us to determine the position of absorption lines with a fortyfold improvement in precision against the most up-to-date published results [1] and expanded the list of lines measured by this technique published in [2].