How can I explain the noise that appears in the photocurrent region by cyclic voltammetry?

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What is the difference between absorption and adsorption?

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Alexey L. Klyuev

What kind of light source do you use? Probably the noise originates from poor stability of light source or/and external sources (like room lamps, windows, etc.).

Lu Gao

bubbles? corrosion? incorrect current range?

Cédric Marien

Thank you, it was a problem with the automatic current range