Spectral lines of Hydrogen, divided into series. Shown on a logarithmic scale.
<a href="//commons.wikimedia.org/wiki/User:OrangeDog" title="User:OrangeDog">OrangeDog</a>
<span class="int-own-work" lang="en">Own work</span> (<span lang="en" dir="ltr">Original text: <i><bdi lang="">Own work by uploader. A logarithmic plot of <i>λ</i> for <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {1 \over \lambda }=R\left({1 \over (n^{\prime })^{2}}-{1 \over n^{2}}\right)}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>1</mn><mi>λ<!-- λ --></mi></mfrac></mrow><mo>=</mo><mi>R</mi><mrow><mo>(</mo><mrow><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>1</mn><mrow><mo stretchy="false">(</mo><msup><mi>n</mi><mrow class="MJX-TeXAtom-ORD"><mi class="MJX-variant" mathvariant="normal">′<!-- ′ --></mi></mrow></msup><msup><mo stretchy="false">)</mo><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msup></mrow></mfrac></mrow><mo>−<!-- − --></mo><mrow class="MJX-TeXAtom-ORD"><mfrac><mn>1</mn><msup><mi>n</mi><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msup></mfrac></mrow></mrow><mo>)</mo></mrow></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle {1 \over \lambda }=R\left({1 \over (n^{\prime })^{2}}-{1 \over n^{2}}\right)}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/db490c827f5819fdafa0438d103ce9d13731cd80" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -2.671ex; width:22.767ex; height:6.343ex;" alt="{\displaystyle {1 \over \lambda }=R\left({1 \over (n^{\prime })^{2}}-{1 \over n^{2}}\right)}"></span>, where <i>n′</i> ranges from 1 to 6, <i>n</i> ranges from <i>n′</i> + 1 to <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \infty }"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mi mathvariant="normal">∞<!-- ∞ --></mi></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle \infty }</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c26c105004f30c27aa7c2a9c601550a4183b1f21" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.338ex; width:2.324ex; height:1.676ex;" alt="\infty "></span>, and <i>R</i> is the <a href="https://en.wikipedia.org/wiki/Rydberg_constant" class="extiw" title="w:Rydberg constant">Rydberg constant</a></bdi></i></span>)