[CP2K-user] What’s the difference between TD-DFT and TD-DFPT?

[msha...@gmail.com]

Hello everyone,

Can you please explain the difference between TD-DFT and TD-DFPT? Why CP2K 
just doesn't use TD-DFT? and where can I read more about this method, the 
TD-DFPT?

Thanks in advance.
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