# ZCross
ZCross is a python library used to read low pressure gas sections from various sources like [LXCat](https://lxcat.net/home/).
## Installation
To install this package just use pip:
``` shell
pip install zcross
```
Cross section databases are not provided by `ZCross`: however, it is possible to download the cross section tables of interest from the [download section](https://nl.lxcat.net/data/download.php) of [LXCat](https:://www.lxcat.net).
Once you download the cross sections in `XML` format, you can save it somewhere (we suggest under `/opt/zcross_data`) and to define an enviroment variable pointing to that path:
``` bash
export ZCROSS_DATA=/opt/zcross_data
```
(you can add it to your `.profile` file)
## Examples
List the database availables:
``` python
import zcross
zs = zcross.load_all()
# be patient, it will take a while ...
for z in zs:
print(z.database)
```
Show the groups and references of a speficic database:
``` python
import zcross
z = zcross.load_by_name('ccc')
for group in z.database:
print(group)
for reference in z.database.references:
print('[{}]:'.format(reference.type))
for k,v in reference.items():
print(' {:<10} : {}'.format(k,v))
```
Show the process of a specific group:
``` python
import zcross
z = zcross.load_by_name('itikawa')
group = z.database[0]
for process in group:
print("Process {}: {}".format(process.id, process.get_simple_type()))
print("Comment: {}\n".format(process.comment))
```
Show the cross section table of a specific process:
``` python
import zcross
z = zcross.load_by_name('phelps')
process = z.database['H2O'][5]
print('Reaction:')
print(process.get_reaction())
print('Energy [{}],\tArea [{}]'.format(process.energy_units, process.cross_section_units))
for energy, area in process:
print('{:8.2f}\t{:e}'.format(energy, area))
```
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