<div dir="ltr">Dear users, <br clear="all"><div>I have come across a specific aspect of the calculations that I seek to understand in greater depth.<br></div><div>In the Technical report about Calculation of hyperfine field in WIEN2k (by Pavel Novak), the formula for the Fermi contact field is simplified as:</div><div><span class="gmail-base"><span class="gmail-mord"><span class="gmail-mord gmail-mathnormal">B</span><span class="gmail-msupsub"><span class="gmail-vlist-t gmail-vlist-t2"><span class="gmail-vlist-r"><span class="gmail-vlist"><span class="gmail-pstrut"></span><span class="gmail-sizing gmail-reset-size6 gmail-size3 gmail-mtight"><span class="gmail-mord gmail-mathnormal gmail-mtight">c</span></span></span><span class="gmail-vlist-s"></span></span><span class="gmail-vlist-r"><span class="gmail-vlist"></span></span></span></span></span><span class="gmail-mspace"></span><span class="gmail-mrel">=</span><span class="gmail-mspace"></span></span><span class="gmail-base"><span class="gmail-strut"></span><span class="gmail-mord">524.3</span><span class="gmail-mspace"></span><span class="gmail-mbin">×</span><span class="gmail-mspace"></span></span><span class="gmail-base"><span class="gmail-strut"></span><span class="gmail-mord gmail-mathnormal">ρ</span><span class="gmail-mopen">(</span><span class="gmail-mord">0</span><span class="gmail-mclose">)</span><span class="gmail-mspace"></span><span class="gmail-mord gmail-text"><span class="gmail-mord">(kG)</span></span></span>  </div><div>I am particularly interested in the derivation that leads to the coefficient 524.3 in this equation. Could someone kindly provide a detailed explanation or point me towards relevant resources that elucidate how this coefficient is determined (i.e, the conversion factors and unit considerations involved in this derivation)? <br></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><b>Wanderson Ferreira</b><div>University of São Paulo<br></div><div>Hyperfine Interactions Group - IPEN </div><div><div>Av. Prof. Lineu Prestes, 2242</div><div>05508-000 São Paulo, SP  -  Brazil</div></div><div><a href="https://orcid.org/0000-0003-0005-8301" target="_blank">https://orcid.org/0000-0003-0005-8301</a><br></div><div><br></div></div></div></div>