ALADDIN2 is a database of plasma collisional processes, curated by the Atomic and Molecular Data Unit at the IAEA. It currently contains 15,902 datasets.
Please contact ch.hill@iaea.org with any questions or comments about this prototype data service.
For queries or requests concerning the data itself, please use the contact form.
Searching ALADDIN2
Click here to search ALADDIN2:
Datasets compiled from published references may be browsed here.
A list of species (in any quantum state) is also available.
We welcome contribtions of datasets for ALADDIN2. Please refer to the documentation for preparing data for submission.
Identifying Species and States in ALADDIN2
The species involved in the CollisionDB processes are identified using the conventions of the pyvalem library:
Atoms are identified by their element symbols:
H
Li, etc.
Molecules are sequences of element symbols, possibly with their numerical stoichiometries given (no underscore characters, _):
BeH
H2O
CH3CH2OH
Any charges are specfied after the formula in the format +, -, +q, -q (no caret characters, ^):
H+
Be+4
CO3-2
Isotopes are specified in parentheses, with the mass number preceding the element symbol (no caret characters, ^); deuterium and tritium may be specified as D and T, respectively:
(6Li)
(13C)
Quantum states are specified in any order using the following conventions:
Atomic configurations as orbitals separated by a period, .:
1s
1s2
1s2.2s
1s2.2s2.2p4
Atomic term symbols as follows (2S+1)L_J: spin multiplicity, 2S+1, followed by orbital angular momentum quantum number label and, optionally, J quantum number; odd parity is optionally specified with the character (o):
2P
2Po_1/2
4D
1S_0
Individual quantum numbers as key-value pairs (no spaces around the = sign):
n=1
|m|=1
Linear molecule electron configurations:
1σ
1σ2
1σg2
1sigmau2.2sigmag1
1sigmag
1σg2.1σu2.2σg2.2σu2.1πu4.3σg2
Molecular term symbols (with or without state labels):