How it works
Links to numerical databases
Dynamic links to GAPHYOR
Test of retrieval program on various platforms
Recent and coming improvements
- The use of this program is presently free, but you can also help us for its development.
- Two versions of the database query are now
available: Standard Query and
Advanced Query. These two versions works the same
way. The main difference resides in the presentation of the query form. The
Advanced one is presented in a more condensed way with more criteria as
bibliographic criteria or chemical elements in a molecule.
- If you wish to be informed about future versions, please leave your
e-mail address in our mailing list.
This program allows to retrieve data (numerical, factual and bibliographic)
in atomic and molecular physics and in gaseous chemistry. The retrieval is
done in 2 steps, filling and submitting successively 2 forms.
First step: Data Retrieval
On the first step, retrieval is done by submiting the "Data Retrieval" form
filled with various criteria such as a molecule, a
process, chemical elements...
As a result of the first step, you get the 2nd form called "Data Selection
and Display" which includes:
You can now select and display the Data:
- A reminder of your request
- The number of records found for each molecular state matching your
request, if you ever defined a molecule in your request.
- The total number of found records
- New criteria to restrict your request if necessary and configure the
- with or without a further selection
- in full decoded mode or in a condensed way in a Postscript file.
Retrievals are done with various criteria which can be used
independently or together:
In the first step:
In the second step:
- One specific "reactant" from the displayed list of reactant states
satisfying your request if you ever specified a reactant in the first step
- The most recent data
- The mode of information display:
- in fully decoded mode, sorted by year, convenient for a small number
- in a postscript file, producing the same format as in GAPHYOR HANDBOOK, for a large number of data
What is a criterion
Every retrieval criterion is shown in the retrieval page by the icon . By clicking on this icon, one obtains
informations related to this criterion. A criterion can be:
- A value to be typed with the keyboard as for the "formula" and the ionisation state of a molecule. In this case:
- A syntax verification is done
- A list of possible values is obtained by the hypertext link preceding
the criterion to be filled
- Fields are not case sensitive
- A value or more selected from a proposed list
- Radio buttons to check
What happens after submitting the first form
Once submitted the first form, depending on how you filled it and the
number of found data, a second form (step 2) is displayed which includes
- A reminder of your query
- The list of molecular states satisfying your
If you specified a molecule in step 1, you get the list of molecular states
which satisfy your query with the number of corresponding data for every
state. If this number is less than 1000, you can select this state as a new
criterion to get data (radio button). Then the search will be done only for
this state, coupled with other criteria selected in step 1 (elements,
process, additional information, ...). Don't forget to switch radio button
(see further) to get
data from the selected molecule and not from the whole set.
- The total number of records obtained
- How to get data
To get data, different cases may occur, depending upon the total number of
found records and whether you specified or not a molecule in your query:
- No records are found: you have to modify your query going back to the
previous page or, sorry, nothing matches your search.
- You specified a molecule in the first step (pass 1):
- The total number of records is less than 1000 ; you can get data:
- from the whole set of states (default case)
- from the selected state. Don't forget to switch
the radio button in this case.
- The total number of records is larger than 1000, you can get data
only from a selected state, no other choice is
- You did not specify a molecule in the first form (step 1). If the
total number of records does not exceed 1000, then you can get data up to
the 300 more recent ones. If the total number is larger than 1000, then you
have to make your request more accurate or to use the facilities described
in the note below.
You can display data in 2 differents ways, depending upon the total number of
- On screen, sorted by year in a fully decoded way (default mode).
Display is then limited to the 50 most recent data.
- In a postscript file, sorted and presented in the same way as in GAPHYOR HANDBOOK, in a condensed way: a table,
with one data per line. This file is afterward transferable by FTP. As
screen display is limited to 50, don't forget to switch the radio button if
you got more data. Postscript files are limited to 300 records
- Displaying up to 50 records on screen and 300 in a postscript file is
arbitrary. If this gives you particular problems, please mail us, we can change this in a
- Sorting of data is limited to 1000 records due to the system
performance. If you wish to get larger sets of Data, you can ask for an
"Expert's Report", or subscribe to an un-limited access (see Fees). In both cases you should then specify your
requests by e-mail: we shall proceed to special retrievals, and we shall
send you the results as booklets, printed in the GAPHYOR UPDATE format.
Actually, 2 molecules or more exactly 2 reactants
can be defined. Those reactants can be either:
7 fields appear on the same line (one line per reactant) to specify an atom or a molecule or an other reactant:
Field 1: the "formula"
The "formula" is the chemical formula of an atom or a molecule, without
specifying its ionisation or excitation state, as for example C1O2 for
The "formula" can also define a particle,
a field or a special reactant, as for example emf for an electro-magnetic field or
(Cu)s for a cupper surface.
- For an atom or a molecule enumerate every atom of the molecule
even for 1. This is to distinguish for example, as the acquisition is case
insensitive, CO (C1O1 = carbon monoxyde), from Co (CO1 = cobalt atom).
- For particles or fields do not enumerate, example: emf.
For electronic collisions or photonic collisions don't specify the electron
or photon as molecule (except for special ones such as a polarized
electron), better specify the section.
- For special reactants 2 possibilities are available:
Warning: there are 2 types of surface:
- Just proceed as for a "standard" reactant and
specify the type of reactant in field 6: surface, iso-electronic series, ...
- Use a plain code:
In this case (plain code), the field 6 doesn't have to be filled.
- (Na1Cl1)s for a surface of NaCl.
- (O1)a for an adsorbed atom or molecule.
- Aa(Li) for the iso-electronic series of Lithium.
- for the clusters (motif and kernel) use the standard notation, using field 6 as above.
Therefore, for the system, if (Cu1S1)s is equivalent to
(S1Cu1)s, (Al-Cu)s is different of (Cu-Al)s.
- stoechiometric: (Cu1S1)s
- alloy: (Al-Cu)s where Aluminium is the prevailing element.
3 fields are available to specify the excitation state of an atom or a molecule:
- 0 or blank for ground state. This is the default value.
- "n"+ where "n" can take the value from 1 to 99.
- "n"- where "n" can take the value from 1 to 20.
- N+ to select any positive ion or molecule: ionization from + to 99+.
- N- to select any negative ion or molecule: ionization from - to 20-.
- all to select atom or molecule disregarding its ionization state.
Select here the type of reactant you want, by default search is
done on standard reactant, clusters and adsorbed molecule:
- Field 3 for "strong" excitation:
- * electronic excitation
- V vibrational excitation
- 0 none, default value
- Field 4 for "weak" excitation:
- r rotational excitation
- n isotopic effect
- p polarized reactant
- by default any of this value is taken into account. It means that for
"SiF4 *", molecule "SiF4 *r" or "SiF4 *nr" will satisfy the criteria.
- Field 5: for "special" excitation:
- m metastable state
- y Rydberg state
- z collective excitation
- by default none
This criteria is to decide whether you want the search to be done on the
initial state or on the final state of the reaction.
- surface and adsorbed molecule
- cluster: motif or kernel
- iso-electronic series
- Chemical elements
- Chemical families
- Number of chemical elements
More information on reactant such as the meaning of various values.
The Database is divided into five sections each
covering a domain of physics, chemical physics and plasma physics. If
necessary, select only the field of interest.
Find in the process list the process you are
looking for. Then copy it into the field (lower or upper case). In the
advanced query, 1 to 4 processes can be selected.
Values and meanings
If the multiple-choice selection table is unreadable or incomplete: please
better try an other browser.
4 kinds of additional information are available:
These 4 types are presented in 4 columns where:
Note: to select a second element in the same column, select it with the
"control" key down (Mac Intosh and PC systems). Proceed the same way to
"unselect" this element.
- Data type: cross-sections, reaction rates, ...
- Nature: experimental data, review paper, ...
- Energy range.
- Special data: clusters, surfaces, isoelectronic series.
Check radio button to select your desired choice. By default no selection
is done (all data).
The physical and chemical systems described in the Database can involve
from 1 to 4 chemical elements, not taking into accounts the "elements" of family PA:
- Numerical values select only data with numerical values on line. Numerical values can be a radiative lifetime, a reaction rate, cross sections, ... For example, to summarily describe a cross section or a potential curve, the maximum value can be given within the range of energy.
- New data are the ones introduced in the database during the current year.
transition probability of He* 1 chemical element
collisions between electrons and CO2 2 chemical elements
collisions between protons (H+) and CO2 3 chemical elements
viscosity of a H3N + CO2 mixture 4 chemical elements
One can select from 1 to 4 chemical elements in the periodic chart (as
long as one does not outpass the number specified by the
In Gaphyor, some particles and fields are considered as chemical reactants
(elements of family PA). They are not taken into account for the evaluation
of the number of elements, but they can be selected ; these pseudo-elements
ef electric field
bf magnetic field
emf electromagnetic field
mu mu meson
eo partially ionized
ei fully (or strongly) ionized gas
Note that there are other particles as for instance electrons and
photons. However, since they are not specific, it is usually not advisable
to select them, because it makes the retrieval more complex without any
significant improvement of the results.
Last modification, February, 20, 2001