Hello everyone,<br /><br />I am implementing Density Fitting (DF) for Hybrid DFT using the MOLOPT basis set.<br /><br />My reference, PySCF, uses the Even-Tempered Basis (ETB) to generate the auxiliary basis set (auxbasis). This ETB is extremely large, often over 10 times the size of the primary basis, making the calculation highly inefficient.<br /><br />I am seeking a method to generate a more compact auxbasis. I know MOLOPT basis come from CP2K, so come here for some help.<br /><br />Could anyone provide references or specific details on:<br /><br />CP2K's strategy for generating these compact MOLOPT auxiliary basis sets (i.e., the recipe that avoids the oversized ETB)?<br /><br />Any specific parameters (like geometric progression rules) that could replace the default PySCF ETB for MOLOPT while maintaining accuracy?<br /><br />Thanks for any guidance!
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