ALADDIN, A Labelled Atomic Data INterface, is a data format developed in order to provide a standard and flexible method for the exchange and management of atomic, molecular, and plasma-surface interaction and material properties data of interest to fusion research.

A schematic illustration of an ALADDIN data entry is shown below:

$AL HL1 HL2 HL3... & BL1 BL2 BL3... #EL (Searchable labels)
! THIS IS A SCHEMATIC ALADDIN ENTRY (Comment lines)
A B C D E F ... (Coefficient field)

The symbols AL, HL, BL indicate generic Access, Hierarchical and Boolean labels, respectively. A specific ALADDIN data entry, e.g., for the ionization of singly-ionized iron in its groundstate by electrons is

$ ION e Fe [+1] (G)
& RC REC ACC=A ORNL-CFADC DOC=NUC-FUS-SUPP/87 06/02/89 #CHEB
! Reaction Rate Coefficients from Experimental data
-37.2224 2.71988 -2.48007 1.033430 -.4456020 .20346000
-.075466300 0.0 0.0 2.0 2.0E+04

The symbols appearing in an ALADDIN data entry are described below.

$ 
The "$" symbol, in column 1, denotes the start of an ALADDIN entry.  The
"$" character, with optional suffix, is taken as the access label.  A
blank access label suffix means that standard ALADDIN entry routines are
to be used. The "$" symbol with, optional suffix, is folowed by the
blank delimeted hierarchical labels.

& 
The "&" symbol denotes the end of the hierarchical and the start of the
Boolean labels.

# 
The "#" symbol denotes the end of the labels fields. The "#" symbol,
with optional suffix, identifies the evaluation function which is used
by ALADDIN to generate numeric data values from the information in the
coefficient field which follows.

! 
The "!" symbol, entered in column 1, of a line identifies that the
information on the remainder of that line are comments for the
particular entry.

REC 
Data recommended by IAEA Atomic and Molecular Data Unit.

EVAL 
Data evaluated and/or recommended by a source other than the IAEA
Atomic and Molecular Data Unit.

COMP 
Data compilation

FORM 
Analytical formula

ORIG 
Taken from original data source

XS 
Integrated collision cross section in recommended units of cm[2]

RC 
Rate Coefficient in recommended units of cm[3]/s for two-body collisions
and in cm[6]/s for three-body collisions

DXS1
Single differential cross section in angle or energy

DXS2
Double differential cross section in angle and energy

WL
Wavelength in recommended units of nm

EN 
Energy of a level in recommended units of eV. For particles, energies 
are specified in recommended units of eV for electrons and eV/u or eV/amu 
for heavy particles.

TEMP 
Temperature (kT) in recommended units of eV

TP 
Transition probability in recommended units /s

LT 
Lifetime (or decay rate) recommended units of s or /s.

DOC 
Reference source for data

{} 
Subscript

[] 
Superscript

() 
Quantum state (where needed to specify reactant or product)

ACC=A+ 
Accuracy 3% or better

ACC=A 
Accuracy between 3% and 10%

ACC=B 
Accuracy greater than 10% and less than or equal to 25%

ACC=C 
Accuracy greater than 25% and less than or equal to 50%

ACC=D 
Accuracy greater than 50% and less than or equal to 100%

ACC=E 
Uncertainty larger than 100%