Figure 4
From: Absolute spectroscopy near 7.8 μm with a comb-locked extended-cavity quantum-cascade-laser
N2O spectroscopy at 0.013 mbar over 65 cm−1. Green line: P(40), 37435005.26(10) MHz; blue line: P(18), 38052238.584(63) MHz; red line: R(31), 39268217.812(78) MHz.
