---
name: "sc_R12Amplitudes"
section: "3"
platform: "linux"
package: "libsc-doc"
version: "2.3.1-22"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/sc_R12Amplitudes"
---

# sc\_R12Amplitudes(3)

R12Amplitudes gives the amplitudes of some linear-R12-ansatz-related terms in wave function.

## NAME

sc::R12Amplitudes - **R12Amplitudes** gives the amplitudes of some linear-R12-ansatz-related terms in wave function.

## SYNOPSIS

`#include <r12_amps.h>`

Inherits **sc::RefCount**.

### Public Member Functions

**R12Amplitudes** (const **RefSCMatrix** &T2\_aa, const **RefSCMatrix** &T2\_ab, const **RefSCMatrix** &Rvv\_aa, const **RefSCMatrix** &Rvv\_ab, const **RefSCMatrix** &Roo\_aa, const **RefSCMatrix** &Roo\_ab, const **RefSCMatrix** &Rvo\_aa, const **RefSCMatrix** &Rvo\_ab, const **RefSCMatrix** &Rxo\_aa, const **RefSCMatrix** &Rxo\_ab)\
 const **RefSCMatrix** **T2\_aa** () const\
 const **RefSCMatrix** **T2\_ab** () const\
 const **RefSCMatrix** **Rvv\_aa** () const\
 const **RefSCMatrix** **Rvv\_ab** () const\
 const **RefSCMatrix** **Roo\_aa** () const\
 const **RefSCMatrix** **Roo\_ab** () const\
 const **RefSCMatrix** **Rvo\_aa** () const\
 const **RefSCMatrix** **Rvo\_ab** () const\
 const **RefSCMatrix** **Rxo\_aa** () const\
 const **RefSCMatrix** **Rxo\_ab** () const\

### Additional Inherited Members

## Detailed Description

**R12Amplitudes** gives the amplitudes of some linear-R12-ansatz-related terms in wave function.

The first-order wave function terms which result from linear R12 terms are: Fij (1)  = Ckl ij  ( r12  \|kl\> - 0.5 rab kl  \|ab\> - 0.5 rmn kl  \|mn\> - ram kl  \|am\> - ra'm kl  \|a'm\> ) where C are optimal first-order coefficients and r are antisymmetrized integrals over r12 operator. Indices a, b are virtual MOs; m,n are occupied MOs; i, j, k, l are active occupied MOs, a' is an RI basis index.

## Author

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