3. Directory structure of the RTAB database

Extensive numerical calculations over the last 25 years by Kissel and Pratt have yielded a systematic self-consistent collection of values. In addition to the S-matrix values themselves, this effort has generated systematic tabulations of related quantities that are of interest for scattering and other investigations. These quantities include self-consistent atomic potentials, form factors, anomalous scattering factors, and bound-bound oscillator strengths. These values and selected programs have been collected in the form of a database that we call RTAB. The directory structure of version 2.0 of the RTAB database is displayed in Table 1.

These values are currently available on-line from the Internet at the following URL

http://www-phys.llnl.gov/Research/scattering/RTAB.html

and via FTP (file transport protocol) at

ftp://www-phys.llnl.gov/pub/rayleigh/RTAB

This database has also been recorded onto CD-ROMs and is available from the author. The database is contained on two standard 650-MB CD-ROM discs that are written in an ISO-9660 format, an international standard that specifies how data is formatted on the CD-ROM. ISO 9660 also includes a specification for directory and file names. A CD-ROM written to the ISO 9660 standard can be read on various computer operating systems including DOS, Macintosh, OS/2, Windows and UNIX.

Table 1. Contents of the RTAB database (version 2.0).
return to tables

Folder name	Description of contents
tables_SM	Differential scattering tables via numerical S-matrix approximation (SM) due to Kissel and Pratt
tables_MFASF	Differential scattering tables via modified relativistic form factor (MF) with angle-independent anomalous scattering factors (ASF)
tables_RFASF	Differential scattering tables via relativistic form factor (RF) with angle-independent anomalous scattering factors (ASF)
tables_MF	Differential scattering tables via modified relativistic form factor (MF)
tables_RF	Differential scattering tables via relativistic form factor (RF)
tables_NF	Differential scattering tables via non-relativistic form factors (NF) due to Hubbell et al. (1975) *not in DS potential*
tables_ASF	Tables of relativistic anomalous scattering factors. Differs from ‘data_ASF’ in that energy-dependent part of the bound-bound transitions has been incorporated in the tables, but result is not reliable for accurate interpolation near resonances.

data_SCF	Dirac-Slater (DS) potentials
data_ASF	Relativistic anomalous scattering factors. Differs from ‘tables_ASF’ in that energy-dependent part of the bound-bound resonances is not directly included in table (bound-bound oscillator strengths stored separately), allowing accurate interpolation to intermediate energies with an appropriate computer code such as ASFTAB, FFTAB
data_MF	Tables of total-atom, shell and subshell modified relativistic form factors (MF)
data_RF	Tables of total-atom and shell relativistic form factors (RF)
data_NF	Tables of total-atom non-relativistic form factors (NF) due to Hubbell et al. (1975) *not in DS potential*
data_PE	Photoeffect cross sections
data_BBT	Bound-bound oscillator strengths (occupied-unoccupied)
data_SRBBT	Spurious-resonance bound-bound oscillator strengths (occupied-occupied)

others	Scattering work of other authors: Cromer and Liberman (1983) – FPRIME code, *not in DS potential* Henke et al. (1993) – f1,f2 anomalous factors, *not in DS potential* Scofield (1973) – photoeffect cross sections 1-1500 keV
codes	Source for selected codes useful for the evaluation of elastic scattering amplitudes

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Information date: Sep. 2, 2000 lk