|  |  | 
               
                  |  | ADMM_PURIFICATION_METHOD {Keyword} | 
               
                  |  | Method that shall be used for wavefunction fitting. Use MO_DIAG for MD. | 
               
                  |  | This keyword cannot be repeated
                     and it expects
                     
                     precisely one keyword. | 
               
                  |  | Default value:
                     MO_DIAG | 
               
                  |  | List of valid keywords: 
                        
                           
                              CAUCHYApply McWeeny purification via general Cauchy representation
                           
                              CAUCHY_SUBSPACEApply McWeeny purification via Cauchy representation in occupied subspace
                           
                              MO_DIAGCalculate MO derivatives via Cauchy representation by diagonalization
                           
                              MO_NO_DIAGCalculate MO derivatives via Cauchy representation by inversion
                           
                              NONEDo not apply any purification | 
               
                  |  | This keyword cites the following reference:
                     
                     [Guidon2010] |