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<title>SIMION</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">SIMION</span></span>

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</style><table class="infobox vevent"><tbody><tr><th colspan="2" class="infobox-above summary">SIMION</th></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_release_life_cycle" title="Software release life cycle">Stable release</a></th><td class="infobox-data"><div style="margin:0px;">8.1.1.1

/ 2012-05-14</div></td></tr><tr style="display:none"><td colspan="2">

</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Operating_system" title="Operating system">Operating system</a></th><td class="infobox-data">Windows</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><a rel="nofollow" class="external free" href="http://simion.com/">http://simion.com/</a></td></tr></tbody></table>

<p><b>SIMION</b> is an <a href="Ion_optics" class="mw-redirect" title="Ion optics">ion optics</a> simulation program that calculates <a href="Electric_field" title="Electric field">electric fields</a> for <a href="Electrode" title="Electrode">electrodes</a> of defined <a href="Voltage" title="Voltage">voltages</a> and ion trajectories in those fields.<sup id="cite_ref-Dahl2000_1-0" class="reference"><a href="#cite_note-Dahl2000-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="Program_development">Program development</h2></div>

<p>The program was developed in the late 1970s by Don C. McGilvery at <a href="La_Trobe_University" title="La Trobe University">La Trobe University</a>, Melbourne, Australia as part of his Ph.D. research<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> working with James Morrison, and was later adapted for <a href="Personal_computer" title="Personal computer">personal computers</a> in 1985 by David A. Dahl at the <a href="Idaho_National_Engineering_and_Environmental_Laboratory" class="mw-redirect" title="Idaho National Engineering and Environmental Laboratory">Idaho National Engineering and Environmental Laboratory</a>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> With Richard Morrison at Monash University, McGilvery developed a Macintosh version of SIMION, known as MacSIMION. In recognition of the importance of their work, McGilvery and Dahl shared the Distinguished Contribution Award from the American Society for Mass Spectrometry in 1998.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>

</p><p>SIMION 8.0 was initially released in 2006. The current version is SIMION 8.1, released in August 2011; minor updates are being released continuously.

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<div class="mw-heading mw-heading2"><h2 id="Calculations">Calculations</h2></div>

<p>SIMION 3D is a widely used ion-optics simulation program in many branches of physics. In SIMION, electrostatic fields can be modelled as boundary value problem solutions of an elliptical partial differential equation called the <a href="Laplace_equation" class="mw-redirect" title="Laplace equation">Laplace equation</a>. The specific method used within SIMION to solve this equation is a <a href="Finite_difference_method" title="Finite difference method">finite difference method</a> called over-relaxation. This technique is applied to a three-dimensional potential array (PA) of points representing electrode and non-electrode regions. The objective is to obtain a best estimate of the voltages for the points between the electrodes. The three-dimensional array is chosen to have either cylindrical or planar symmetry or no symmetry at all. The Laplace equation has the convenient property that its solution is a sum over the contribution from each electrode. Therefore, after the electric field array has been found once by iteration, the voltages of the individual electrodes can be changed and the new fields are immediately obtained.

</p><p>When the electric fields have been obtained, the trajectories of charged particles in these fields can be calculated. Particle trajectory calculations are a result of three interdependent computations. First, electrostatic forces must be calculated at the current position of the ion. These forces are then used to compute the current ion acceleration and then by numerical integration techniques to predict the position and velocity of the ion at the next time step. Moreover, the time step itself is continuously adjusted to maximize trajectory accuracy. A standard fourth-order <a href="Runge%E2%80%93Kutta_method" class="mw-redirect" title="Runge–Kutta method">Runge–Kutta method</a> is used for numerical integration of the ion trajectory in three dimensions.

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<ul><li><a href="Electrostatic_lens" title="Electrostatic lens">Electrostatic lens</a></li>

<li><a href="Einzel_lens" title="Einzel lens">Einzel lens</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite id="CITEREFDahl2000" class="citation journal cs1">Dahl, D. (2000). "SIMION for the personal computer in reflection". <i>International Journal of Mass Spectrometry</i>. <b>200</b> (<span class="nowrap">1–</span>3): <span class="nowrap">3–</span>25. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2000IJMSp.200....3D">2000IJMSp.200....3D</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2FS1387-3806%2800%2900305-5">10.1016/S1387-3806(00)00305-5</a>.</cite></span>

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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite id="CITEREFMcGilvery1978" class="citation web cs1">McGilvery, D.C. (1978). <a rel="nofollow" class="external text" href="http://www.latrobe.edu.au/library/">"Photodissociation of positive ions - Thesis (Ph.D.)"</a>. La Trobe University.</cite></span>

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<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20060926045359/http://www.inl.gov/chemistry/massspecaward.shtml">"Envisioning Ions with SIMION"</a>. Idaho National Laboratory. Archived from the original on 2006-09-26<span class="reference-accessdate">. Retrieved <span class="nowrap">2008-12-16</span></span>.</cite><span class="cs1-maint citation-comment"><code class="cs1-code">{{cite web}}</code>: CS1 maint: bot: original URL status unknown (link)</span></span>

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<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.asms.org/about/asms-awards/distinguished-contribution">"ASMS Distinguished Contribution Award"</a>.</cite></span>

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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><a rel="nofollow" class="external text" href="http://www.simion.com/">SIMION home page</a></li>

<li><a rel="nofollow" class="external text" href="https://www.inl.gov/chemistry/simion.shtml">SIMION 7.0 at INL</a></li></ul>

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