Preliminary Experimental Confirmation of a Predicted 2.35 THz Fundamental Spectral Scale

This paper presents a preliminary experimental open-data test of a fixed terahertz prediction derived from a closed quartic variational framework. The framework predicts a fundamental spectral scale at 2.35 THz, together with a quartic hierarchy given by the associated lower and upper companions 0.5875 THz and 9.4 THz. The prediction is not fitted to experimental data and the target frequencies are fixed before analysis. Two independent THz datasets are examined. In the Menlo/CaTx THz-TDS data, a local absorbance structure is found at 2.345102 THz, within 0.208% of the predicted fundamental scale, together with a lower hierarchical component at 0.587591 THz, essentially coincident with 0.5875 THz. In the independent RadiationHardnessSTE dataset, a refined local minimum in the normalized CO2 spectrum is found at 2.349142 THz, within 0.0365% of 2.35 THz, and an upper hierarchical feature is found at 9.406026 THz, within 0.0641% of 9.4 THz. The analysis does not claim final experimental proof. It establishes instead that two independent open THz datasets contain local spectral structures compatible with the fixed predicted hierarchy. The result therefore constitutes a preliminary experimental confirmation and an open-data falsification test survived by the predicted 2.35 THz scale. Definitive validation requires dedicated broadband THz measurements with controlled reference/sample acquisition, environmental controls, repeated measurements, and explicit verification of the three prescribed hierarchical targets.