title: Structural and vibrational properties of solid nitromethane under high pressure by density functional theory.
abstract: The structural, vibrational, and electronic properties of solid nitromethane under hydrostatic pressure of up to 20 GPa have been studied using density functional theory. The changes of cell volume, the lattice constants, and the molecular geometry of solid nitromethane under hydrostatic loading are examined, and the bulk modulus B0 and its pressure derivative B0' are fitted from the volume-pressure relation. Our theoretical results are compared with available experiments. The change of electron band gap of nitromethane under high pressure is also discussed. Based on the optimized crystal structures, the vibrational frequencies for the internal and lattice modes of the nitromethane crystal at ambient and high pressures are computed, and the pressure-induced frequency shifts of these modes are discussed.
authors.affiliation: Institute of High Pressure and High Temperature Physics, Southwest Jiaotong University, Chengdu 610031, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
authors.forename: Jijun
authors.initials: J
authors.lastname: Zhao
authors.forename: Dongqing
authors.initials: D
authors.lastname: Wei
authors.forename: Zizheng
authors.initials: Z
authors.lastname: Gong
mesh_terms: D002627:Chemistry, Physical / Q000379:methods; D003460:Crystallization; D004548:Elasticity; D004563:Electrochemistry / Q000379:methods*; D004583:Electrons; D006874:Hydrostatic Pressure; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D009595:Nitroparaffins / Q000737:chemistry*; D011312:Pressure; D011487:Protein Conformation; D012984:Software; D014732:Vibration
chemical_list: D009595:Nitroparaffins; D008697:Methane; C008640:nitromethane