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The wide span and high density of lines in its rovibrational spectrum renderhydrogen cyanide a useful spectroscopic media for referencing absolutefrequencies of lasers in optical communication and dimensional metrology. Wedetermined, for the first time to the best of our knowledge, the moleculartransitions' center frequencies of the H13C14N isotope in the range from 1526nm to 1566 nm with 1,3e-10 fractional uncertainty. We investigated themolecular transitions with a highly coherent and widely tunable scanning laserthat was precisely referenced to a Hydrogen maser through an optical frequencycomb. We demonstrated an approach to stabilize the operational conditionsneeded to maintain the constantly low pressure of the hydrogen cyanide to carryout the saturated spectroscopy with the third-harmonic synchronousdemodulation. We demonstrated approximately a fourtyfold improvement in theline centers' resolution compared to the previous result.

Absolute frequencies of H13C14N hydrogen cyanide transitions in 1,5 {\mu}m region with saturated spectroscopy and sub-kHz scanning laser