|
This is only a help page,
it gives a brief explanation for
each search option without allowing the submit function. To submit a
request start by entering at the top of the page NEL and Z,
and and by clicking the "Search" button (at the top right)
proceed to the next step to configure the options.
The database has more than 120000 transitions Li- through
S-like and others. The data files are directly accessible via the links in the
Periodic table. However, the search has the advantage of
allowing to select, sort and display data from various sources. The
user can configure the search for a set of transitions and a
range of atoms. The search is limited and only the first 5000 transitions
will be returned.
The search proceeds in two steps. Step I:
Selection of electronic systems (by entering the number of electrons) and
atoms. The server returns a page with levels which have been
found in the database along with a list of options for configuring
the output. Step II: Search configuration.
|
|
Help on Step I, selecting
Atoms and Electronic systems:
The first step is to select the electronic
system (or a range) and the atom (or a range of atoms) by entering
values for NEL (Number of electrons) and Z (atomic number) in
the corresponding fields (on the top of the page). The
following input is valid:
The user can enter either
a single integer, or two integers seperated by a hyphen. Example for
a valid entry: - 10-12 This will select all data with NEL=10,
NEL=11 and NEL=12
- Atomic number: Commas between atomic
numbers and ranges are allowed, examples:
- atoms seprated by commas: 12,14,19
- single atoms and ranges of atoms : 7,8,12-16, 20-22
Help for Step II configuring the output.
|
|
Select options and levels to display transitions:
|
|
Transition Types |
|
Select LS, LSJ: |
Both:
LS: LSJ: |
Help: By default both LS and LSJ transitions are displayed,
the user can view both or select either one.
|
|
Select type (default is to show all): |
E1:
E2:
M1:
M2:
|
Help: By default all E1, E2, M1 and M2 transitions
are displayed, the user can leave the boxes unchecked and
all will be shown. By checking a box (or a combination),
the output will be limited to the selected types only
|
|
Optional output.
|
|
Display Zeeman factors, g_J (if available)
| Y:
|
Help:Zeeman factors have been computed for the
majority of levels, checking the box will show
where available.
|
|
Display .lsj file from the inquery (N/A)
|
Y: |
Help: Not decided yet if this is necessary, the
data (incl. the original .lsj nfiles) are available by
following the links on the Periodic table.
|
|
Plot vs Z.(only for a single transition) (N/A)
|
f_ik vs. Z:
S vs. Z: Aki vs. Z: |
Help: Not yet avaialable
|
|
Select a sorting option: |
Apply search limits on all: |
Help: The default sorting option is by multiplets, the user
can select a different sorting criterion. The search can be limited
with respect to transition properties by applying an AND combination of
numerical limits.
|
| Multiplets, display energy levels:
|
% Lifetime contribution |
Help: The search function reads the data files and computes the
average multiplet (LS) values. The search returns a table of transitions
for each combination of NEL and Z. If the option "display energy levels"
is checked, before each transition table a table of levels
with energies, lifetimes and g_J factors (if selected) will be displayed.
If both LS and LSJ transitions were selected, in both tables: levels and
transitions average LS values will be shown on the fnirst line followed by
each LSJ transition.
|
Help: If a complete set of decay transition rates is present,
then the contribution of each transition can be computed. In this case
the user can submit a limit to display only the significant transitions
with contribution to the lifetime of a level greater then the specified
limit. The user can enter a % factor. For example: 0.1% will ignore
all transitions with contribution to the lifetimes
smaller than 0.001.
|
|
Branching ratio (N/A)
|
%
Low threshold |
Help: If lifetimes are available, this option will
return all transitions ordered by their branching ratios.
A table with transitions is displayed for each NEL and each Z.
|
Help: The user can select a low threshold limit for displaying
transitions based on their branching ratios.
The user can enter a % factor. For example: 0.1% will display
all transitions with branching ratios greater than 0.001.
|
|
f_ik values
|
Enter low limit |
Help: This option shows all transitions ordered by
their f_ik values high->low. A single table is shown for the
search (ALL NEL and Z). Levels are not displayed
|
Help: The user can select a low threshold limit for displaying
f_ik values of a transition. The expected entry is a fraction:
For example: 0.001 will display all transitions with f_ik > 0.001.
|
|
Line strength
|
Enter low limit |
Help: The same as f_ik.
|
Help: The same as f_ik.
|
|
Wavelentghts
|
to
Limits (nm)
|
Help: The wavelengths are ordered Low->High. Only one
table is returned for all atoms and electronic systems
|
Help: Low and high limits can be entered, the units are nm.
|
|
From the table below select the levels then Display transitions
|
|
|
| |
Help: After selecting limiting options and
levels, "Display transitions" submits the request to the server.
("Display transitions" been disabled here).
|
|
Levels for requested electronic systems: (NEL=12, Z=13)
|