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):
1Σ+g
1SIGMA+g
a(3SIGMA-g)
X(3Π)
X(3PI)
A(1A")
Search DataSets
There are currently 122,578 datasets. Click for advice on specifying species and states.
Please contact ch.hill@iaea.org with any questions or comments about this prototype data service.
Citation: Users are encouraged to cite the original data provider(s) with the references provided in the metadata associated with each dataset. The CollisionDB database may also be cited as CollisionDB: A database of collisional processes in plasmas, https://db-amdis.org/collisiondb/search/, International Atomic Energy Agency (2022).