17515
Our chief conclusions are as follows : ( a ) the effect of dispersion is dominated by same - spin correlation ( or triplet - pair correlation , from a different perspective ) ; ( b ) singlet - pair correlation is important for the surface , but qualitatively very dissimilar to the dispersion component ; ( c ) single and double excitations beyond third order are essentially unimportant for this surface ; ( d ) connected triple excitations do play a role but are statistically very similar to the MP2 singlet - pair correlation ; ( e ) the form of the damping function is crucial for good performance of empirical dispersion corrections ; ( f ) at least in the lower - energy regions , SCS - MP2 and especially MP2 . 5 perform very well ; ( g ) novel spin - component scaled double hybrid functionals such as DSD - PBEP86 - D2 acquit themselves very well for this problem .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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