Fig. 7: Methanol line recorded by frequency modulation. | Nature Communications

Fig. 7: Methanol line recorded by frequency modulation.

From: Frequency stable and low phase noise THz synthesis for precision spectroscopy

Fig. 7

Second derivative Voigt fit (orange trace) and residuals (green line) of the (6−1A ← 5−1A) methanol line (black points) lying around 292.673 GHz. Effective Gaussian and Lorentzian widths are found to be 716 and 233 kHz, respectively. The wavemeter-precision-limited line position retrieved is 292.674(5) GHz, which is in agreement with the HITRAN value of 292.6729(3) GHz.

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