Table of Contents

## What is basis set Gaussian?

A basis set in theoretical and computational chemistry is a set of functions (called basis functions) which are combined in linear combinations (generally as part of a quantum chemical calculation) to create molecular orbitals.

### What is def2 TZVP basis set?

def2-TZVPPD – Valence triple-zeta with two sets of polarization functions and a set of diffuse functions. def2-QZVP – Valence quadruple-zeta polarization.

#### What is Gaussian basis function?

A common type of basis function for such models is the Gaussian basis function. This type of model uses the kernel of the normal (or Gaussian) probability density function (PDF) as the basis function. The. in this basis function determines the spacing between the different basis functions that combine to form the model …

**What is a primitive Gaussian?**

Primitive Gaussian functions. • In the jargon of quantum chemistry a single Gaussian function is called a. primitive Gaussian function, or primitive GTO (Gaussian Type Orbital) • Some programs use Cartesian primitive GTOs: • Other programs use Spherical primitive GTOs.

**What is the basis set exchange?**

The Basis Set Exchange (BSE) provides a web-based user interface for downloading and uploading Gaussian-type (GTO) basis sets, including effective core potentials (ECPs), from the EMSL Basis Set Library.

## What does gaussian09 run with?

* GREEN Set – RHF Gaussian09 runs with, in order, the internal basis set, internal + 5D 7F, EMSL basis set, and EMSL basis set + 5D 7F * RED and GREEN bordered – the energies compared for the relative energies of the two programs. * Gaussian – CRYSTAL Difference Using Boxed Values – Should be Obvious

### What is 6-31G‡ in Gaussian 16?

6-31G†: Gaussian 16 also includes the 6-31G† and 6-31G‡ basis sets of George Petersson and coworkers, defined as part of various Complete Basis Set methods [ Petersson88, Petersson91 ]. These are accessed via the 6-31G (d’) and 6-31G (d’,p’) keywords (respectively).

#### What is the gaussian09 B3LYP background color?

* YELLOW Background – Gaussian09’s B3LYP/6-31G (d,p) calculations with the EMSL 6-31G (d,p) Basis Set * ORANGE Set – Gaussian Alternative B3LYP/6-31G (d,p) (B5LYP) calculations with the internal 6-31G (d,p) Basis Set