1 hartree = 627.5095 kcal/mol（資料來源：https://lab409chem.ccu.edu.tw/var/file/80/1080/img/866/qchem.pdf）

實驗值來源1 (the Source of Experimental Values)

https://drive.google.com/file/d/1wVvoO9crlIPmT3q6E0iVtizfp6pJ55Q9/view?usp=share_link