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. 2022 Jun 30;7(27):23842–23850. doi: 10.1021/acsomega.2c02523

Table 2. Approximate Thermal Sampling Depth (Calculated Using a = 1.13 × 10–3 cm2/s).

modulation frequency (kHz) VOPD (cm/s) calculated sampling depth (μm) [1550 cm–1] calculated sampling depth (μm) [1375 cm–1]
2.5 0.16 12.2 12.9
5 0.32 8.6 9.1
10 0.64 6.1 6.5
20 1.28 4.3 4.6