Home › Forums › setting the stage › solids as quantum systems › The answers to video This topic has 0 replies, 1 voice, and was last updated 2 weeks, 1 day ago by KobeVD. Viewing 1 post (of 1 total) Author Posts September 27, 2025 at 12:54 pm #13163 KobeVDParticipant Definition; A collection of atoms/molecules that can be described in the classical way by the use of springs with the positions of the atoms/molecules fixed into a crystalline structure. 1) (Hydrogen) atom 2) Two hydrogen atoms 3) Free moving H2 molecule 4) d= 0 Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In