Xray::...altout(3pm)

💫 cross_section 💫

okay bestie, welcome to the Xray::...altout(3pm) page 💖 this lil guy lives in the User Contributed Perl Documentation, and it is so niche but so valid. let's get into it 🧪✨

cross_section

example time, keep up 🫶

$xsec = Xray::Absorption -> cross_section($elem, $energy, $mode);

@xsec = Xray::Absorption -> cross_section($elem, \@energy, $mode);

the $mode argument is different here than it is for the other resources, okay? not like the others, main character energy 👑

the options are:

• "xsec"
• "photo"
• "coherent"
• "incoherent"

and they tell this method to hand you back either the full cross-section, or just the photoelectric portion, or just the coherent portion, or just the incoherent portion. pick your fighter 💅

the values for all cross-sections are computed as log-log polynomials, exactly as described in the original paper by Shaltout et al. no cap 📈

---

🌸 NAME 🌸

Xray::Absorption::Shaltout — it's a Perl interface to the Shaltout tables. that's it, that's the whole vibe 🎀

✨ SYNOPSIS ✨

use Xray::Absorption;
Xray::Absorption -> load("shaltout");

if you want the full details, go read the documentation for Xray::Absorption — this page is just the Shaltout-flavoured side quest 🦋

💜 DESCRIPTION 💜

this module gets inherited by the Xray::Absorption module, and it gives you access to the data inside:

Update of photoelectric absorption coefficients in the tables of McMaster Abdallah Shaltout, Horst Ebel, and Robert Svagera X-Ray Spectrometry (2006) vol. 35, p. 52-56

so the data lives in a database file called shaltout.db 📁 and that file gets generated at install time from a flat text database of the data. where's the flat text version? it's over at http://www.ifp.tuwien.ac.at/forschung/abdallah.shaltout/, as explained in the reference. iconique 🌈

also, the required Chemistry::Elements module is available from CPAN, in the miscellaneous modules section. go get it, bestie 🛍️

🦋 EDGE AND LINE ENERGIES 🦋

the Shaltout data resource includes all K, L, M, and N edges — but it does not provide any of the line energies. so, like, a minimal set of line energies gets imported from the McMaster data resource instead. borrowing from the neighbours, we love to see it 🙈💕

💀 BUGS AND THINGS TO DO 💀

this module has not been tested sufficiently. so like... be careful out there, fr fr 😭

👑 AUTHOR 👑

• Bruce Ravel, bravel@bnl.gov
• http://cars9.uchicago.edu/~ravel/software/Absorption/

---

aaaand that's a wrap on the Xray::...altout(3pm) page 💅 this was perl v5.34.0, dated 2022-06-28, and it's a whole Xray::...altout(3pm) moment — stay hydrated, stay calibrated, slay 🫶✨🍓