Figure 2: Observation of two Lamb-dip signals I and II resolved from an overlapped feature in the FT spectrum of CH3NH2. | Scientific Reports

Figure 2: Observation of two Lamb-dip signals I and II resolved from an overlapped feature in the FT spectrum of CH3NH2.

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

Figure 2

The spectrum was recorded in a scanning range of 50 MHz using the lower microwave sideband of the 9P22 CO2 laser line. The sample pressure was 20 mTorr and the lock-in time constant was 30 ms. Signals I and II are assigned as transitions Q(0 As 8, 8) and Q(0 As 5, 5), respectively. The observation of Signal II has previously been reported in Ref. 28 and has been confirmed here. This chart demonstrates features of the high power for observation of the saturated absorption spectra and the wide frequency-tunability of the microwave sidebands of CO2 laser lines.

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