|
- What are the types of bond orders? - Matter Modeling Stack Exchange
Laplacian Bond Order This method is an extension of the QTAIM (Quantum Theory of Atoms In Molecules) concept of using the Laplacian of the electron density ∇2ρ ∇ 2 ρ to characterize bonding Standard QTAIM just uses the value of ∇2ρ ∇ 2 ρ at bond critical points (minimum electron density along the bond, max along orthogonal directions), but these values are unintuitive and often
- Scanning two bond lengths G-16 - Matter Modeling Stack Exchange
When you are scanning two bond lengths in Gaussian, you step once through the first bond scan, and complete stepping through the second bond scan 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
- proteins - From a PDB file, how may I know which atoms have bonds . . .
A bond is present when the distance between two atoms is lower than the sum of the Van der Waals radii of the two atoms Van der Waals radii are typically looked up from a preexisting table, not calculated We can find such tables in chemical reference books or online For instance, here is a link that supplies the following Van der Waals radii
- Visualise bonds in ASE - Matter Modeling Stack Exchange
To visualize a trajectory in ASE, you have to use the default 'ase' viewer The 'x3d' viewer currently only allows visualizing one structure When you open the ase viewer GUI, you can simply press Ctrl+B to visualize bonds, and Ctrl+U to visualize unit cell In command line, you can simply do ase gui -b md traj to visualize bonds If you want to make a movie that shows the change of the bonds
- How to carry out BSSE correction in ORCA?
I'm working on a diatomic molecule and need to accurately describe its bond dissociation energy I plan to perform BSSE correction (Counterpoise or some other) for this molecule While Gaussian handles this in a single step, I'm struggling with how to carry out this correction in ORCA
- 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?
|
|
|