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              <p>We report the nonlinear absorption and refraction of Ag&lt;sub&gt;29&lt;/sub&gt; nanocluster aqueous suspensions using the open and closed aperture Z-scan method at 532 nm. The stoichiometry of the atomically precise silver nanoclusters has been determined by mass spectrometry, and their formula is Ag&lt;sub&gt;29&lt;/sub&gt;DHLA&lt;sub&gt;12&lt;/sub&gt; where the ligand is dihydrolipoic acid (DHLA). Using different concentration of nanoclusters, we observe beyond the expected linear absorption saturation and nonlinear absorption a clear saturation of the nonlinear absorption, a feature so far not described for nanoclusters. The nonlinear refraction is also determined and exhibits a regular behavior with a negative &lt;em&gt;n&lt;/em&gt;&lt;sub&gt;2&lt;/sub&gt; value. A figure of merit is discussed in view of potential applications.</p>
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