XASLIB: X-ray Absorption Data Library

Upload XAS Spectra to the X-ray Absorption Data Library:

You must be logged in to upload data.

Notes on Uploading Files:

Uploaded files must be ASCII files no larger than 16Mb with a Header Section followed by a Data Table Section.
The Header Section contains strings that describe the meta-data for the data file. Ideally, these will follow the XAS Data Interchange Specification. See Example Data Files for this library.
The Data Table Section contains columns for indvidual arrays. Columns should be separated or delimited by a combination of spaces, tabs, or commas. Each line of the file (ending with a Newline and optional Carriage Return character) corresponds to one row of the Data Table, representing a different energy point for the data. Up to 32 columns will be accessible.

Somewhere in the columns of the Data Table there Must be columns for

Energy or Monochromator Angle, in units of eV, keV, or degrees.
Arrays that can be used to build \(\mu(E)\) or mu(Energy). These arrays will be columns in the Data Table that may represent of I_0, I_transmission, I_fluorescence, or mu_transmission, mu_fluorescence. Note that it is OK to have emission modes other than fluorescence -- they will be treated in the same way as fluorescence data.

Names for the columns will be automatically deduced from the data file. These names these may not be perfectly aligned with what you expect the column labels to be. Still, when uploading data, you will be expected to be able to deduce which columns are appropriate and what the column name. During the Verification process, you will be shown plots of the resulting mu vs Energy.

You will be expected to fill in values for some meta-data including:

Sample Name
Absorbing Element and Edge
Monochromator d-spacing or nominal reflecting cut
Energy units
Beamline
Measurement Mode

Some of this meta-data may be guessed from the file headers. In additions, some validity and error checking will be done on these values. Ultimately, the quality of the data relies on you verifying the correctness of these fields.

Some additional notes:

The data will be sorted so that Energy is strictly increasing. A warning will be given if any of the steps in energy value is less than 0.001 eV, as this may cause problems for some processing software.
Ideally, there will be a separate column of I_0, but this is not required.
You can include data for a reference channel, either I_reference, or mu_referencee. Note that the reference channel can either be in one of three modes:
1. Transmission, with reference sample downstream of I_transmission, so that mu_reference = -log(I_reference/I_transmission)
2. Fluorescence, with reference upstream of sample, so that mu_reference = (I_reference/I_0)
3. Fluorescence, with reference downstream of sample, so that mu_reference = (I_reference/I_transmission)

Finally, because uploading files uses finite computing resources, we reserve the right to restrict or remove any data for any reason without notice and to ban users who abuse the ability to upload data.