---
name: "cints"
section: "1"
platform: "linux"
package: "psi3"
version: "3.4.0-6+b3"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/cints"
---

# cints(1)

**NAME**      **cints**      **- One- and Two-Electron (Derivative) Integrals Program**

**DESCRIPTION**

The program **cints**      **computes (derivative) integrals of some one- and two-electron operators which appear in**  **quantum chemical theories** **over symmetry-adapted cartesian and spherical harmonics Gaussian functions.**

**DOCUMENTATION**

Man-page is no longer supported. HTML-based documentation is  in index.html.

input.dat	Input file FILE30	Checkpoint file FILE31

```

```

```
output.dat
FILE33   Electron repulsion integrals
FILE35   All one-electron integrals

```

**INPUT FORMAT**     **Input for this program is read from the file** **input.dat.** **Most of the keywords are not necessary for routine** **task. The following keywords are valid:**

**PRINT =** *integer* **Determines amount of information to be printed. Defaults to 0.**

**CUTOFF =** *integral* **The negative of the exponent of the cutoff imposed on two-electron integrals.** **Default is 15 which results in two-electron integrals of greater than 1e-15** **magnitude to be stored in FILE33.**

**S\_FILE =** *integer* **The file number to store overlap integrals. Defaults to 35.**

**T\_FILE =** *integer* **The file number to store kinetic energy integrals. Defaults to 35.**

**V\_FILE =** *integer* **The file number to store nuclear attraction integrals. Defaults to 35.**

**ERI\_FILE =** *integer* **The file number to store electron repulsion integrals. Defaults to 33.**