Figure 3: Lamb-dip signal for the Q(0 As 8, 8) line of the C−N stretching band of CH3NH2 (signal I in Fig. 2), scanned in a range of 3 MHz with a step-size of 10 kHz and recorded with the lock-in amplifier in 2f detection mode. | Scientific Reports

Figure 3: Lamb-dip signal for the Q(0 As 8, 8) line of the C−N stretching band of CH3NH2 (signal I in Fig. 2), scanned in a range of 3 MHz with a step-size of 10 kHz and recorded with the lock-in amplifier in 2f detection mode.

From: Lamb-dip spectroscopy of the C−N stretching band of methylamine by using frequency-tunable microwave sidebands of CO2 laser lines

Figure 3

The lock-in time constant was 30ms and the sample pressure of CH3NH2 was 14 mTorr. The solid curve (red) is a least-squares fit of a second-derivative Gaussian profile to the experimental trace (black). The microwave frequency at line center was determined from the fit to be 12839.477 MHz.

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