Abstract
This letter reports measurements of the intensity-dependent transmittance of ethylene near 949 cm−1. The qualitatively different behavior of transmittance for the CO2 laser lines P(12) and P(16), which are nearly symmetrically located on opposite sides of the ground-state resonance, is described in terms of a 3-level model with an anharmonic frequency shift in the excited-state resonance. The results are also compared to the predicted intensity-dependent transmittance for a 2-level model.
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