When working with reference values in nanometers that aren’t explicitly listed as bandwidths, you have two practical options:

🔍 1. Interpolation

You can interpolate between the listed values to estimate the value you need. This is especially helpful when you require a more precise reference point within a known range. Interpolation is a scientifically valid method and often used in analytical chemistry when exact values aren’t available.

📈 2. Use the Next Higher Value

Alternatively, you can simply use the next higher listed value as an approximation. This is often sufficient because:

• The official reference values typically differ only in the third or fourth significant figure.
• Most instruments have a wavelength accuracy of ±1–2 nm, so these small differences are not detectable in practice.

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✅ Summary:  If your reference wavelength isn’t listed:

• Interpolate for precision.
• Use the next higher value for convenience.
• Either approach is valid, and the difference is negligible given typical instrument tolerances.

📌 For Information Only

• Cell Path Length: 1.0 cm
• Reference Material: H₂O

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