# Electronic Circular Dichroism
## Available Methods
See the [`spectrum`](./uvvis.md#spectrum) keyword for details.
## Example Input File
An example input file for CCS takes the following form:
```
@method settings
basis: STO-3G
@end

@memory
max_mem: 1
@end

@jobs
task: ccs
@end

@ccs
restart: False
nstates: 3
spectrum: True
ecd: True
@end

@scf
conv_thresh: 1.0E-12
@end

@molecule
charge: 0
multiplicity: 1
units: bohr
xyz:
O        0.0000000000    0.0000000000    0.0000000000
H        0.0000000000    1.4304281903    1.1071565216
H        0.0000000000   -1.4304281903    1.1071565216
@end
```
## Relevant Keywords

| `ecd` <a id="ecd"></a> |  |
|------------------------|---------------------------------------------------------------------------------------------|
| **Description**        | Calculation of dipole rotational strengths for ECD spectra.                                |
| **Type**               | bool                                                                                        |
| **Default**            | False                                                                                       |
| **Requirements**       |Requires the [`spectrum`](./uvvis.md#spectrum) keyword to be True |