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What are the types of bond orders? - Matter Modeling Stack Exchange For a fixed bond length and spin multiplet (e g , triplet spin state at 200 pm bond length), the SZ=S and SZ=0 molecules are almost energy degenerate (except for a tiny spin-orbit coupling energy), have nearly identical electron density distributions, and therefore should have similar computed bond orders
Lost atoms in LAMMPS - Matter Modeling Stack Exchange #Create a simulation box units real dimension 3 atom_style full bond_style hybrid morse harmonic angle_style harmonic dihedral_style charmm improper_style umbrella special_bonds dreiding pair_style hybrid overlay lj cut coul long 12 0 hbond dreiding lj 4 6 6 5 90 kspace_style pppm 1 0e-4 dielectric 1 0 boundary p p p region awmix block -50 58
Scanning two bond lengths G-16 - Matter Modeling Stack Exchange For example, consider the case where you are scanning the bond lengths of C-Cl and C-H in chloromethane The code will first increment the bond length of C-Cl, and will then scan the C-H bond while keeping C-Cl bond constant This will result in a 2D scan, with one axis corresponding to C-Cl bond and other corresponding to C-H bond
How may I estimate the bond energy of a molecule? Can I estimate the bond energy by running a single Gaussian calculation of the fragments at very long separation (say, 40 angstroms)? Or do I have to calculate each fragment without the other? quantum-chemistry
Simulating breaking bonds in molecular dynamics The sigma, pi and double pi bonds contribute increasingly to the overall bond order (max individual bond order is 1) as the atoms get closer together For simplicity I am leaving out the corrections made to the overall bond order necessitated by overcoordination The bond stretching potential takes the form of a modified Morse potential
molecular modeling - Bond length from infrared spectra? - Matter . . . $\begingroup$ You can get some estimates on bond strengths (in simple cases), which might be useful for ordering bond orders strengths (the "classical" literature on metal-carbonyl complexes has used that extensively) This does not, however, assign a bond length, but might be used to estimate it from other known compounds based on the bond
density functional theory - How to treat delocalized pi bonds in DFT . . . On the other hand, running a valence bond type calculation would require some careful tuning of the settings This is because the usual Hartree-Fock type calculations consider all orbitals are delocalized (in the sense that they can have contributions from all atomic orbitals), and does not attempt to localize them $\endgroup$
Is it possible to do a Gaussian redundant scan with some fixed bonds? B indicates bond and F requests Gaussian to freeze that coordinate The last line indicates that the bond (B) between atoms 5 and 6 are scanned (S) with 20 steps of size -0 1 Angstrom In the image you posted in the question, the bond between 5 and 6 is long, so during the scan, the bond length would have to decrease which is why the step size
visualization software - Which is the best way to display bonds . . . $\begingroup$ Yes, all of these programs use some semiempirical rules to determine whether there is a bond between the atoms or not Jmol and Chimera link all atoms; Vesta, Ovito and VMD appear to link none It's all a matter of how you define a bond - which is a highly nontrivial question in general $\endgroup$ –