We report on a precision spectroscopic study of room-temperature H12C13CH in the 6463-6520 cm-1 range, using a continuous-wave diode laser phase-locked to a near-infrared optical frequency comb synthesizer stabilized, in turn, against a GPS-disciplined rubidium clock. By tuning the comb repetition frequency, several ro-vibrational transitions in the P and R branches of the 2nu3 overtone band are recorded. Accuracy levels as low as 100 kHz, 5·10-10in fractional terms, are obtained in the determination of absolute line-center frequencies. In addition, line intensities are measured for the first time, with a best fractional uncertainty of 1%, and used to retrieve the purely vibrational transition dipole moment in conjunction with the first-order Herman-Wallis factor. Finally, the pressure broadening coefficients gammaself are also derived for the studied transitions.
Di Sarno, V., De Natale, P., Tasseva, J., Santamaria, L., Canè, E., Tamassia, F., et al. (2018). Frequency-comb-assisted absolute calibration and linestrength of H12C13CH ro-vibrational transitions in the 2nu3 band. JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 206, 31-35 [10.1016/j.jqsrt.2017.10.030].
Frequency-comb-assisted absolute calibration and linestrength of H12C13CH ro-vibrational transitions in the 2nu3 band
Canè, Elisabetta;Tamassia, Filippo;
2018
Abstract
We report on a precision spectroscopic study of room-temperature H12C13CH in the 6463-6520 cm-1 range, using a continuous-wave diode laser phase-locked to a near-infrared optical frequency comb synthesizer stabilized, in turn, against a GPS-disciplined rubidium clock. By tuning the comb repetition frequency, several ro-vibrational transitions in the P and R branches of the 2nu3 overtone band are recorded. Accuracy levels as low as 100 kHz, 5·10-10in fractional terms, are obtained in the determination of absolute line-center frequencies. In addition, line intensities are measured for the first time, with a best fractional uncertainty of 1%, and used to retrieve the purely vibrational transition dipole moment in conjunction with the first-order Herman-Wallis factor. Finally, the pressure broadening coefficients gammaself are also derived for the studied transitions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
