Corrigendum to “Enhanced selectivity and sensitivity of the first harmonic detection in a compact differential photoacoustic cell for sensing ammonia at trace levels”. [Measurement 244 (2025) 116464]

The authors regret for the units reported for sensitivity slopes in two locations within the article. In both cases, the units were incorrectly listed as μV/ppmv instead of V/ppmv. Correction 1 In the Abstract, the text currently reads: “Calibration curves demonstrated superior sensitivity of FHD (SlopeFHD = (2.15 ± 0.01) × 10-7 μV/ppmv) compared to the second harmonic detection (SlopeSHD = (1.621 ± 0.005) × 10-7 μV/ppmv) and the amplitude modulation (SlopeAM = (2.010 ± 0.002) × 10-7 μV/ppmv).” It should read: “Calibration curves demonstrated superior sensitivity of FHD (SlopeFHD = (2.15 ± 0.01) × 10-7 V/ppmv) compared to the second harmonic detection (SlopeSHD = (1.621 ± 0.005) × 10-7 V/ppmv) and the amplitude modulation (SlopeAM = (2.010 ± 0.002) × 10-7 V/ppmv).” Correction 2 In the Concluding remarks and outlook section, the text currently reads: “The calibration curves further demonstrated better sensitivity of the FHD mode (SlopeFHD = (2.15 ± 0.01) × 10-7 μV/ppmv), surpassing both SHD (SlopeSHD = (1.621 ± 0.005) × 10-7 μV/ppmv) and AM (SlopeAM = (2.010 ± 0.002) × 10-7 μV/ppmv).” It should read: “The calibration curves further demonstrated better sensitivity of the FHD mode (SlopeFHD = (2.15 ± 0.01) × 10-7 V/ppmv), surpassing both SHD (SlopeSHD = (1.621 ± 0.005) × 10-7 V/ppmv) and AM (SlopeAM = (2.010 ± 0.002) × 10-7 V/ppmv).” The authors would like to apologize for any inconvenience caused.